commit 8792e5275ad01e3e0001012b061570c677f62e3a
Author: Adam Wick <awick@uhsure.com>
Date:   Fri Dec 23 19:45:56 2022 -0800

    🌅

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..f1ce8e9
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/acw/advent2022
+
+go 1.19
+
+require golang.org/x/exp v0.0.0-20221126150942-6ab00d035af9
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..560d2c7
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/exp v0.0.0-20221126150942-6ab00d035af9 h1:yZNXmy+j/JpX19vZkVktWqAo7Gny4PBWYYK3zskGpx4=
+golang.org/x/exp v0.0.0-20221126150942-6ab00d035af9/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
diff --git a/inputs/example.1 b/inputs/example.1
new file mode 100644
index 0000000..444e241
--- /dev/null
+++ b/inputs/example.1
@@ -0,0 +1,14 @@
+1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000
\ No newline at end of file
diff --git a/inputs/example.10a b/inputs/example.10a
new file mode 100644
index 0000000..fd7eba8
--- /dev/null
+++ b/inputs/example.10a
@@ -0,0 +1,3 @@
+noop
+addx 3
+addx -5
\ No newline at end of file
diff --git a/inputs/example.10b b/inputs/example.10b
new file mode 100644
index 0000000..94cd0a8
--- /dev/null
+++ b/inputs/example.10b
@@ -0,0 +1,146 @@
+addx 15
+addx -11
+addx 6
+addx -3
+addx 5
+addx -1
+addx -8
+addx 13
+addx 4
+noop
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx -35
+addx 1
+addx 24
+addx -19
+addx 1
+addx 16
+addx -11
+noop
+noop
+addx 21
+addx -15
+noop
+noop
+addx -3
+addx 9
+addx 1
+addx -3
+addx 8
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+noop
+addx -36
+noop
+addx 1
+addx 7
+noop
+noop
+noop
+addx 2
+addx 6
+noop
+noop
+noop
+noop
+noop
+addx 1
+noop
+noop
+addx 7
+addx 1
+noop
+addx -13
+addx 13
+addx 7
+noop
+addx 1
+addx -33
+noop
+noop
+noop
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+addx -1
+addx 2
+addx 1
+noop
+addx 17
+addx -9
+addx 1
+addx 1
+addx -3
+addx 11
+noop
+noop
+addx 1
+noop
+addx 1
+noop
+noop
+addx -13
+addx -19
+addx 1
+addx 3
+addx 26
+addx -30
+addx 12
+addx -1
+addx 3
+addx 1
+noop
+noop
+noop
+addx -9
+addx 18
+addx 1
+addx 2
+noop
+noop
+addx 9
+noop
+noop
+noop
+addx -1
+addx 2
+addx -37
+addx 1
+addx 3
+noop
+addx 15
+addx -21
+addx 22
+addx -6
+addx 1
+noop
+addx 2
+addx 1
+noop
+addx -10
+noop
+noop
+addx 20
+addx 1
+addx 2
+addx 2
+addx -6
+addx -11
+noop
+noop
+noop
\ No newline at end of file
diff --git a/inputs/example.11 b/inputs/example.11
new file mode 100644
index 0000000..c04eddb
--- /dev/null
+++ b/inputs/example.11
@@ -0,0 +1,27 @@
+Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1
\ No newline at end of file
diff --git a/inputs/example.12 b/inputs/example.12
new file mode 100644
index 0000000..433e0d2
--- /dev/null
+++ b/inputs/example.12
@@ -0,0 +1,5 @@
+Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi
\ No newline at end of file
diff --git a/inputs/example.13 b/inputs/example.13
new file mode 100644
index 0000000..af73fbb
--- /dev/null
+++ b/inputs/example.13
@@ -0,0 +1,23 @@
+[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]
diff --git a/inputs/example.14 b/inputs/example.14
new file mode 100644
index 0000000..1926028
--- /dev/null
+++ b/inputs/example.14
@@ -0,0 +1,2 @@
+498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9
\ No newline at end of file
diff --git a/inputs/example.15 b/inputs/example.15
new file mode 100644
index 0000000..652e631
--- /dev/null
+++ b/inputs/example.15
@@ -0,0 +1,14 @@
+Sensor at x=2, y=18: closest beacon is at x=-2, y=15
+Sensor at x=9, y=16: closest beacon is at x=10, y=16
+Sensor at x=13, y=2: closest beacon is at x=15, y=3
+Sensor at x=12, y=14: closest beacon is at x=10, y=16
+Sensor at x=10, y=20: closest beacon is at x=10, y=16
+Sensor at x=14, y=17: closest beacon is at x=10, y=16
+Sensor at x=8, y=7: closest beacon is at x=2, y=10
+Sensor at x=2, y=0: closest beacon is at x=2, y=10
+Sensor at x=0, y=11: closest beacon is at x=2, y=10
+Sensor at x=20, y=14: closest beacon is at x=25, y=17
+Sensor at x=17, y=20: closest beacon is at x=21, y=22
+Sensor at x=16, y=7: closest beacon is at x=15, y=3
+Sensor at x=14, y=3: closest beacon is at x=15, y=3
+Sensor at x=20, y=1: closest beacon is at x=15, y=3
\ No newline at end of file
diff --git a/inputs/example.16 b/inputs/example.16
new file mode 100644
index 0000000..85fa5b0
--- /dev/null
+++ b/inputs/example.16
@@ -0,0 +1,10 @@
+Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
+Valve BB has flow rate=13; tunnels lead to valves CC, AA
+Valve CC has flow rate=2; tunnels lead to valves DD, BB
+Valve DD has flow rate=20; tunnels lead to valves CC, AA, EE
+Valve EE has flow rate=3; tunnels lead to valves FF, DD
+Valve FF has flow rate=0; tunnels lead to valves EE, GG
+Valve GG has flow rate=0; tunnels lead to valves FF, HH
+Valve HH has flow rate=22; tunnel leads to valve GG
+Valve II has flow rate=0; tunnels lead to valves AA, JJ
+Valve JJ has flow rate=21; tunnel leads to valve II
\ No newline at end of file
diff --git a/inputs/example.17 b/inputs/example.17
new file mode 100644
index 0000000..fb5d89e
--- /dev/null
+++ b/inputs/example.17
@@ -0,0 +1 @@
+>>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>
\ No newline at end of file
diff --git a/inputs/example.18a b/inputs/example.18a
new file mode 100644
index 0000000..5d3cb99
--- /dev/null
+++ b/inputs/example.18a
@@ -0,0 +1,2 @@
+1,1,1
+2,1,1
\ No newline at end of file
diff --git a/inputs/example.18b b/inputs/example.18b
new file mode 100644
index 0000000..d18bf98
--- /dev/null
+++ b/inputs/example.18b
@@ -0,0 +1,13 @@
+2,2,2
+1,2,2
+3,2,2
+2,1,2
+2,3,2
+2,2,1
+2,2,3
+2,2,4
+2,2,6
+1,2,5
+3,2,5
+2,1,5
+2,3,5
\ No newline at end of file
diff --git a/inputs/example.19 b/inputs/example.19
new file mode 100644
index 0000000..5212cde
--- /dev/null
+++ b/inputs/example.19
@@ -0,0 +1,2 @@
+Blueprint 1: Each ore robot costs 4 ore. Each clay robot costs 2 ore. Each obsidian robot costs 3 ore and 14 clay. Each geode robot costs 2 ore and 7 obsidian.
+Blueprint 2: Each ore robot costs 2 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 8 clay. Each geode robot costs 3 ore and 12 obsidian.
\ No newline at end of file
diff --git a/inputs/example.2 b/inputs/example.2
new file mode 100644
index 0000000..db60e36
--- /dev/null
+++ b/inputs/example.2
@@ -0,0 +1,3 @@
+A Y
+B X
+C Z
diff --git a/inputs/example.20 b/inputs/example.20
new file mode 100644
index 0000000..5cbf3d9
--- /dev/null
+++ b/inputs/example.20
@@ -0,0 +1,7 @@
+1
+2
+-3
+3
+-2
+0
+4
\ No newline at end of file
diff --git a/inputs/example.21 b/inputs/example.21
new file mode 100644
index 0000000..7993b87
--- /dev/null
+++ b/inputs/example.21
@@ -0,0 +1,15 @@
+root: pppw + sjmn
+dbpl: 5
+cczh: sllz + lgvd
+zczc: 2
+ptdq: humn - dvpt
+dvpt: 3
+lfqf: 4
+humn: 5
+ljgn: 2
+sjmn: drzm * dbpl
+sllz: 4
+pppw: cczh / lfqf
+lgvd: ljgn * ptdq
+drzm: hmdt - zczc
+hmdt: 32
\ No newline at end of file
diff --git a/inputs/example.22 b/inputs/example.22
new file mode 100644
index 0000000..8bc2e1e
--- /dev/null
+++ b/inputs/example.22
@@ -0,0 +1,14 @@
+        ...#
+        .#..
+        #...
+        ....
+...#.......#
+........#...
+..#....#....
+..........#.
+        ...#....
+        .....#..
+        .#......
+        ......#.
+
+10R5L5R10L4R5L5
diff --git a/inputs/example.23a b/inputs/example.23a
new file mode 100644
index 0000000..57a5784
--- /dev/null
+++ b/inputs/example.23a
@@ -0,0 +1,6 @@
+.....
+..##.
+..#..
+.....
+..##.
+.....
diff --git a/inputs/example.23b b/inputs/example.23b
new file mode 100644
index 0000000..c84aa7c
--- /dev/null
+++ b/inputs/example.23b
@@ -0,0 +1,12 @@
+..............
+..............
+.......#......
+.....###.#....
+...#...#.#....
+....#...##....
+...#.###......
+...##.#.##....
+....#..#......
+..............
+..............
+..............
diff --git a/inputs/example.3 b/inputs/example.3
new file mode 100644
index 0000000..9919ffa
--- /dev/null
+++ b/inputs/example.3
@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw
\ No newline at end of file
diff --git a/inputs/example.4 b/inputs/example.4
new file mode 100644
index 0000000..99a66c5
--- /dev/null
+++ b/inputs/example.4
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
\ No newline at end of file
diff --git a/inputs/example.5 b/inputs/example.5
new file mode 100644
index 0000000..edacdb9
--- /dev/null
+++ b/inputs/example.5
@@ -0,0 +1,10 @@
+    [D]    
+[N] [C]    
+[Z] [M] [P]
+ 1   2   3 
+
+move 1 from 2 to 1
+move 3 from 1 to 3
+move 2 from 2 to 1
+move 1 from 1 to 2
+
diff --git a/inputs/example.6 b/inputs/example.6
new file mode 100644
index 0000000..3ef83c6
--- /dev/null
+++ b/inputs/example.6
@@ -0,0 +1,5 @@
+mjqjpqmgbljsphdztnvjfqwrcgsmlb
+bvwbjplbgvbhsrlpgdmjqwftvncz
+nppdvjthqldpwncqszvftbrmjlhg
+nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg
+zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw
diff --git a/inputs/example.7 b/inputs/example.7
new file mode 100644
index 0000000..09a921e
--- /dev/null
+++ b/inputs/example.7
@@ -0,0 +1,23 @@
+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k
diff --git a/inputs/example.8 b/inputs/example.8
new file mode 100644
index 0000000..16d6fbd
--- /dev/null
+++ b/inputs/example.8
@@ -0,0 +1,5 @@
+30373
+25512
+65332
+33549
+35390
diff --git a/inputs/example.9 b/inputs/example.9
new file mode 100644
index 0000000..cbea2b3
--- /dev/null
+++ b/inputs/example.9
@@ -0,0 +1,8 @@
+R 4
+U 4
+L 3
+D 1
+R 4
+D 1
+L 5
+R 2
\ No newline at end of file
diff --git a/inputs/example.9b b/inputs/example.9b
new file mode 100644
index 0000000..60bd43b
--- /dev/null
+++ b/inputs/example.9b
@@ -0,0 +1,8 @@
+R 5
+U 8
+L 8
+D 3
+R 17
+D 10
+L 25
+U 20
diff --git a/inputs/input.1 b/inputs/input.1
new file mode 100644
index 0000000..af23468
--- /dev/null
+++ b/inputs/input.1
@@ -0,0 +1,2249 @@
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diff --git a/inputs/input.10 b/inputs/input.10
new file mode 100644
index 0000000..e34c882
--- /dev/null
+++ b/inputs/input.10
@@ -0,0 +1,139 @@
+addx 1
+noop
+noop
+noop
+addx 5
+addx 5
+noop
+noop
+addx 9
+addx -5
+addx 1
+addx 4
+noop
+noop
+noop
+addx 6
+addx -1
+noop
+addx 5
+addx -2
+addx 7
+noop
+addx 3
+addx -2
+addx -38
+noop
+noop
+addx 32
+addx -22
+noop
+addx 2
+addx 3
+noop
+addx 2
+addx -2
+addx 7
+addx -2
+noop
+addx 3
+addx 2
+addx 5
+addx 2
+addx -5
+addx 10
+noop
+addx 3
+noop
+addx -38
+addx 1
+addx 27
+noop
+addx -20
+noop
+addx 2
+addx 27
+noop
+addx -22
+noop
+noop
+noop
+noop
+addx 3
+addx 5
+addx 2
+addx -11
+addx 16
+addx -2
+addx -17
+addx 24
+noop
+noop
+addx 1
+addx -38
+addx 15
+addx 10
+addx -15
+noop
+addx 2
+addx 26
+noop
+addx -21
+addx 19
+addx -33
+addx 19
+noop
+addx -6
+addx 9
+addx 3
+addx 4
+addx -21
+addx 4
+addx 20
+noop
+addx 3
+addx -38
+addx 28
+addx -21
+addx 9
+addx -8
+addx 2
+addx 5
+addx 2
+addx -9
+addx 14
+addx -2
+addx -5
+addx 12
+addx 3
+addx -2
+addx 2
+addx 7
+noop
+noop
+addx -27
+addx 28
+addx -36
+noop
+addx 1
+addx 5
+addx -1
+noop
+addx 6
+addx -1
+addx 5
+addx 5
+noop
+noop
+addx -2
+addx 20
+addx -10
+addx -3
+addx 1
+addx 3
+addx 2
+addx 4
+addx 3
+noop
+addx -30
+noop
diff --git a/inputs/input.11 b/inputs/input.11
new file mode 100644
index 0000000..5c9dd85
--- /dev/null
+++ b/inputs/input.11
@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 66, 59, 64, 51
+  Operation: new = old * 3
+  Test: divisible by 2
+    If true: throw to monkey 1
+    If false: throw to monkey 4
+
+Monkey 1:
+  Starting items: 67, 61
+  Operation: new = old * 19
+  Test: divisible by 7
+    If true: throw to monkey 3
+    If false: throw to monkey 5
+
+Monkey 2:
+  Starting items: 86, 93, 80, 70, 71, 81, 56
+  Operation: new = old + 2
+  Test: divisible by 11
+    If true: throw to monkey 4
+    If false: throw to monkey 0
+
+Monkey 3:
+  Starting items: 94
+  Operation: new = old * old
+  Test: divisible by 19
+    If true: throw to monkey 7
+    If false: throw to monkey 6
+
+Monkey 4:
+  Starting items: 71, 92, 64
+  Operation: new = old + 8
+  Test: divisible by 3
+    If true: throw to monkey 5
+    If false: throw to monkey 1
+
+Monkey 5:
+  Starting items: 58, 81, 92, 75, 56
+  Operation: new = old + 6
+  Test: divisible by 5
+    If true: throw to monkey 3
+    If false: throw to monkey 6
+
+Monkey 6:
+  Starting items: 82, 98, 77, 94, 86, 81
+  Operation: new = old + 7
+  Test: divisible by 17
+    If true: throw to monkey 7
+    If false: throw to monkey 2
+
+Monkey 7:
+  Starting items: 54, 95, 70, 93, 88, 93, 63, 50
+  Operation: new = old + 4
+  Test: divisible by 13
+    If true: throw to monkey 2
+    If false: throw to monkey 0
diff --git a/inputs/input.12 b/inputs/input.12
new file mode 100644
index 0000000..615b920
--- /dev/null
+++ b/inputs/input.12
@@ -0,0 +1,41 @@
+abccccccccaaaaaaaccaaaaaaaaaaaaaaaaccccccccccccccccccccccccccccccccccccaaaaaa
+abccccccccaaaaaaaccaaaaaaaaaaaaaaaaccccccccccccccccccccccccccccccccccccaaaaaa
+abccccccccccaaaaaaccaaaaaaaaaaaaaaaaccccccccccccccccacccccccccccccccccccaaaaa
+abcccccaaaacaaaaaaccaaaaaaaaaaaaaaaaacccccccccccccccaaaccccaccccccccccccccaaa
+abccccaaaaacaaccccccaaaaaacaaacaacaaaaaaacccccccccccaaaacccaacccccccccccccaaa
+abaaccaaaaaaccccaaacaaaacacaaacaaccaaaaaacccccccccccaklaccccccccccccccccccaac
+abaaccaaaaaaccaaaaaacccccccaaacccaaaaaaaccccccccccckkkllllccccccccccccccccccc
+abaaccaaaaaaccaaaaaacccccccaaaaacaaaaaaacccccccccckkkklllllcccccccaaaccaccccc
+abacccccaacccccaaaaacccccccaaaaaccaaaaaaacccccccckkkkpppllllccccccaaaaaaccccc
+abacccccccccccaaaaacccccccccaaaacccaaaaaaccccccckkkkpppppplllccccddddaaaccccc
+abccccccccccccaaaaaccccccccccaaaccaaaccccccccccckkkppppppppllllldddddddaccccc
+abccacccccccccccccccccccccccccccccaaccccccccccckkkopppupppplllmmmmdddddaacccc
+abccaaacaaaccccccccccccccccccccaaaaaaaaccccccckkkkopuuuuupppllmmmmmmddddacccc
+abccaaaaaaaccccccccccccccccccccaaaaaaaacccccjjkkkooouuuuuuppqqqqqmmmmddddcccc
+abccaaaaaacccccccccccccccaaccccccaaaacccccjjjjjjoooouuxuuuppqqqqqqmmmmdddcccc
+abcaaaaaaaacccccccccccccaaacccccaaaaaccccjjjjoooooouuuxxuuvvvvvqqqqmmmdddcccc
+abaaaaaaaaaacccccccaaaaaaacaacccaacaaacccjjjooooouuuuxxxxvvvvvvvqqqmmmdddcccc
+abaaaaaaaaaacccaaacaaaaaaaaaacccacccaaccjjjooootttuuuxxxyyvyyvvvqqqmmmeeecccc
+abcccaaacaaacccaaaaaaacaaaaaccccccccccccjjjooottttxxxxxxyyyyyyvvqqqmmmeeccccc
+abcccaaacccccccaaaaaacaaaaaccccaaccaacccjjjnnntttxxxxxxxyyyyyvvvqqqnneeeccccc
+SbccccaacccccccaaaaaaaaacaaacccaaaaaacccjjjnnntttxxxEzzzzyyyyvvqqqnnneeeccccc
+abcccccccccccccaaaaaaaaacaaccccaaaaaccccjjjnnnttttxxxxyyyyyvvvrrrnnneeecccccc
+abcccaacccccccaaaaaaaaaccccccccaaaaaacccciiinnnttttxxxyyyyywvvrrrnnneeecccccc
+abcccaaaaaaccaaaaaaaacccccccccaaaaaaaaccciiiinnnttttxyyywyyywvrrrnnneeecccccc
+abcccaaaaaaccaaaaaaaacccccccccaaaaaaaacccciiinnnntttxwywwyyywwwrrnnneeecccccc
+abcaaaaaaaccaaaaaaaaaccccccccccccaacccccccciiinnnttwwwwwwwwwwwwrrnnneeecccccc
+abcaaaaaaaccaaaaaacccccccccccccccaaccccccaaiiiinnttwwwwwwwwwwwrrrnnnffecccccc
+abcccaaaaaaccaaaaaccccccccccccccccccccaaaaaciiinnssswwwssssrwwrrrnnnfffcccccc
+abaacaaccaaccaaaccccccccaacccccccccccccaaaaaiiinnssssssssssrrrrrronnfffcccccc
+abaccaaccaacccccccccaaacaacccccccccccccaaaaaiiimmmssssssmoosrrrrooonffaaacccc
+abaaaccccaaaaaaccccccaaaaaccccccccccccaaaaaccihmmmmsssmmmoooooooooofffaaacccc
+abaaaccccaaaaaacccccccaaaaaacccccccccccccaacchhhmmmmmmmmmoooooooooffffaaccccc
+abaacccaaaaaaaccccccaaaaaaaaccccaaccccccccccchhhhmmmmmmmgggggooofffffaaaccccc
+abaacccaaaaaaaccccccaaaaaaaccccaaaaccccccccccchhhhmmmmhggggggggfffffaaaaccccc
+abccccccaaaaaaacccccaacaaaaacccaaaaccccccccccchhhhhhhhggggggggggfffaacaaccccc
+abccaacccaaaaaaccccccccaaaaaccaaaaacccccccccccchhhhhhhggaaaaaaccccccccccccccc
+abccaaaccaaccccccccccccccaaaaaaaaaccccccccccccccchhhhaaaccaaaacccccccccccccaa
+abaaaaaaaccccccccccccccccaaaaaaaaccccccccccccccccccccaaaccccaaccccccccccccaaa
+abaaaaaaaccccccccaaaccccacaaaaaacccccccccccccccccccccaaaccccccccccccccccccaaa
+abaaaaaacccccccaaaaacaaaaaaaaaaacccccccccccccccccccccaaccccccccccccccccaaaaaa
+abaaaaaacccccccaaaaaaaaaaaaaaaaaaacccccccccccccccccccccccccccccccccccccaaaaaa
diff --git a/inputs/input.13 b/inputs/input.13
new file mode 100644
index 0000000..e37467b
--- /dev/null
+++ b/inputs/input.13
@@ -0,0 +1,449 @@
+[[9,[8,[7]],4,7,[[4,9,3,2],6,5,[1,10,2,4,5],[1,3,2,6,1]]],[4,[6],3],[4,[7,0,3,8,8],[7,[10],[10,10,10,7]]]]
+[[],[[6,4,[5],4,[0,5,5]],3,[5,[],9]],[[[5,1,6,2],[6,4,7],[4,7,4,2]],[10,[],[6,9,4],[6,2],9]],[[[10,5,9],10,0,[4,1,4,10,1],1],[7,7,[10,8],6],2]]
+
+[[[8,2],2,[[10],[],6,10,[10,10,3,10,3]]],[],[]]
+[[[[7,3,5],10,[4,1,0,8,7],9],10,[]]]
+
+[[6,2,[2,[10,10,0],[2]],7]]
+[[7,9],[5,[8,[0,5,5,10,4],6,8,6],3,[4],2],[4]]
+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
+[[[6,6,[0,5,3,10],10],[3,0,7,[8],[3,9,10,1,7]],8,[6,9,[]],[1]],[],[5],[5,[4,[6,9],2,[8],[]],0]]
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+
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+
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+
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+
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diff --git a/inputs/input.14 b/inputs/input.14
new file mode 100644
index 0000000..7bef215
--- /dev/null
+++ b/inputs/input.14
@@ -0,0 +1,144 @@
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+477,63 -> 481,63
+492,82 -> 496,82
+476,117 -> 476,114 -> 476,117 -> 478,117 -> 478,110 -> 478,117 -> 480,117 -> 480,110 -> 480,117 -> 482,117 -> 482,114 -> 482,117 -> 484,117 -> 484,113 -> 484,117 -> 486,117 -> 486,113 -> 486,117
+476,117 -> 476,114 -> 476,117 -> 478,117 -> 478,110 -> 478,117 -> 480,117 -> 480,110 -> 480,117 -> 482,117 -> 482,114 -> 482,117 -> 484,117 -> 484,113 -> 484,117 -> 486,117 -> 486,113 -> 486,117
+513,170 -> 517,170
+476,117 -> 476,114 -> 476,117 -> 478,117 -> 478,110 -> 478,117 -> 480,117 -> 480,110 -> 480,117 -> 482,117 -> 482,114 -> 482,117 -> 484,117 -> 484,113 -> 484,117 -> 486,117 -> 486,113 -> 486,117
+490,131 -> 490,134 -> 482,134 -> 482,139 -> 501,139 -> 501,134 -> 495,134 -> 495,131
+493,23 -> 493,21 -> 493,23 -> 495,23 -> 495,18 -> 495,23 -> 497,23 -> 497,19 -> 497,23 -> 499,23 -> 499,18 -> 499,23 -> 501,23 -> 501,18 -> 501,23 -> 503,23 -> 503,15 -> 503,23 -> 505,23 -> 505,16 -> 505,23
+483,57 -> 487,57
+493,23 -> 493,21 -> 493,23 -> 495,23 -> 495,18 -> 495,23 -> 497,23 -> 497,19 -> 497,23 -> 499,23 -> 499,18 -> 499,23 -> 501,23 -> 501,18 -> 501,23 -> 503,23 -> 503,15 -> 503,23 -> 505,23 -> 505,16 -> 505,23
+498,175 -> 498,176 -> 505,176
+486,60 -> 490,60
+497,147 -> 497,148 -> 513,148 -> 513,147
+493,23 -> 493,21 -> 493,23 -> 495,23 -> 495,18 -> 495,23 -> 497,23 -> 497,19 -> 497,23 -> 499,23 -> 499,18 -> 499,23 -> 501,23 -> 501,18 -> 501,23 -> 503,23 -> 503,15 -> 503,23 -> 505,23 -> 505,16 -> 505,23
+513,151 -> 513,155 -> 510,155 -> 510,161 -> 519,161 -> 519,155 -> 515,155 -> 515,151
+486,82 -> 490,82
+493,23 -> 493,21 -> 493,23 -> 495,23 -> 495,18 -> 495,23 -> 497,23 -> 497,19 -> 497,23 -> 499,23 -> 499,18 -> 499,23 -> 501,23 -> 501,18 -> 501,23 -> 503,23 -> 503,15 -> 503,23 -> 505,23 -> 505,16 -> 505,23
+493,23 -> 493,21 -> 493,23 -> 495,23 -> 495,18 -> 495,23 -> 497,23 -> 497,19 -> 497,23 -> 499,23 -> 499,18 -> 499,23 -> 501,23 -> 501,18 -> 501,23 -> 503,23 -> 503,15 -> 503,23 -> 505,23 -> 505,16 -> 505,23
+490,131 -> 490,134 -> 482,134 -> 482,139 -> 501,139 -> 501,134 -> 495,134 -> 495,131
+477,85 -> 481,85
+493,23 -> 493,21 -> 493,23 -> 495,23 -> 495,18 -> 495,23 -> 497,23 -> 497,19 -> 497,23 -> 499,23 -> 499,18 -> 499,23 -> 501,23 -> 501,18 -> 501,23 -> 503,23 -> 503,15 -> 503,23 -> 505,23 -> 505,16 -> 505,23
+463,98 -> 463,97 -> 463,98 -> 465,98 -> 465,94 -> 465,98 -> 467,98 -> 467,94 -> 467,98 -> 469,98 -> 469,88 -> 469,98 -> 471,98 -> 471,90 -> 471,98 -> 473,98 -> 473,97 -> 473,98 -> 475,98 -> 475,95 -> 475,98
+483,63 -> 487,63
+513,151 -> 513,155 -> 510,155 -> 510,161 -> 519,161 -> 519,155 -> 515,155 -> 515,151
+466,103 -> 466,104 -> 481,104 -> 481,103
+463,98 -> 463,97 -> 463,98 -> 465,98 -> 465,94 -> 465,98 -> 467,98 -> 467,94 -> 467,98 -> 469,98 -> 469,88 -> 469,98 -> 471,98 -> 471,90 -> 471,98 -> 473,98 -> 473,97 -> 473,98 -> 475,98 -> 475,95 -> 475,98
+463,98 -> 463,97 -> 463,98 -> 465,98 -> 465,94 -> 465,98 -> 467,98 -> 467,94 -> 467,98 -> 469,98 -> 469,88 -> 469,98 -> 471,98 -> 471,90 -> 471,98 -> 473,98 -> 473,97 -> 473,98 -> 475,98 -> 475,95 -> 475,98
+494,144 -> 494,145 -> 504,145 -> 504,144
+493,39 -> 493,43 -> 489,43 -> 489,51 -> 501,51 -> 501,43 -> 496,43 -> 496,39
+490,131 -> 490,134 -> 482,134 -> 482,139 -> 501,139 -> 501,134 -> 495,134 -> 495,131
+476,117 -> 476,114 -> 476,117 -> 478,117 -> 478,110 -> 478,117 -> 480,117 -> 480,110 -> 480,117 -> 482,117 -> 482,114 -> 482,117 -> 484,117 -> 484,113 -> 484,117 -> 486,117 -> 486,113 -> 486,117
+494,144 -> 494,145 -> 504,145 -> 504,144
+476,117 -> 476,114 -> 476,117 -> 478,117 -> 478,110 -> 478,117 -> 480,117 -> 480,110 -> 480,117 -> 482,117 -> 482,114 -> 482,117 -> 484,117 -> 484,113 -> 484,117 -> 486,117 -> 486,113 -> 486,117
diff --git a/inputs/input.15 b/inputs/input.15
new file mode 100644
index 0000000..7121b8c
--- /dev/null
+++ b/inputs/input.15
@@ -0,0 +1,19 @@
+Sensor at x=3482210, y=422224: closest beacon is at x=2273934, y=-202439
+Sensor at x=3679395, y=2737332: closest beacon is at x=4104213, y=2980736
+Sensor at x=3173475, y=3948494: closest beacon is at x=3494250, y=3554521
+Sensor at x=27235, y=3642190: closest beacon is at x=-190885, y=3635525
+Sensor at x=3851721, y=1754784: closest beacon is at x=3145586, y=2167751
+Sensor at x=327074, y=3250656: closest beacon is at x=-190885, y=3635525
+Sensor at x=3499970, y=3186179: closest beacon is at x=3494250, y=3554521
+Sensor at x=150736, y=2522778: closest beacon is at x=-85806, y=2000000
+Sensor at x=3000768, y=3333983: closest beacon is at x=2564067, y=3163630
+Sensor at x=1751302, y=1660540: closest beacon is at x=3145586, y=2167751
+Sensor at x=2591068, y=2923079: closest beacon is at x=2564067, y=3163630
+Sensor at x=48946, y=3999178: closest beacon is at x=-190885, y=3635525
+Sensor at x=3695475, y=3863101: closest beacon is at x=3494250, y=3554521
+Sensor at x=1504031, y=2760: closest beacon is at x=2273934, y=-202439
+Sensor at x=3021186, y=2667125: closest beacon is at x=3145586, y=2167751
+Sensor at x=1514629, y=3771171: closest beacon is at x=2564067, y=3163630
+Sensor at x=234064, y=616106: closest beacon is at x=-85806, y=2000000
+Sensor at x=3990843, y=3393575: closest beacon is at x=4104213, y=2980736
+Sensor at x=768875, y=2665271: closest beacon is at x=-85806, y=2000000
diff --git a/inputs/input.16 b/inputs/input.16
new file mode 100644
index 0000000..1792b0b
--- /dev/null
+++ b/inputs/input.16
@@ -0,0 +1,62 @@
+Valve AV has flow rate=0; tunnels lead to valves AX, PI
+Valve JI has flow rate=0; tunnels lead to valves VD, HF
+Valve FF has flow rate=0; tunnels lead to valves ZL, CG
+Valve CG has flow rate=10; tunnels lead to valves TI, SU, RV, FF, QX
+Valve RC has flow rate=18; tunnels lead to valves EQ, WR, AD
+Valve ZJ has flow rate=0; tunnels lead to valves GJ, WI
+Valve GJ has flow rate=21; tunnels lead to valves TG, YJ, EU, AZ, ZJ
+Valve VJ has flow rate=0; tunnels lead to valves UJ, AA
+Valve ER has flow rate=0; tunnels lead to valves QO, ZK
+Valve QO has flow rate=24; tunnels lead to valves MF, ER
+Valve LN has flow rate=0; tunnels lead to valves ZR, TI
+Valve SU has flow rate=0; tunnels lead to valves CG, LM
+Valve AJ has flow rate=12; tunnels lead to valves QX, JW, TR, MK
+Valve YJ has flow rate=0; tunnels lead to valves GJ, EQ
+Valve JW has flow rate=0; tunnels lead to valves YI, AJ
+Valve WI has flow rate=13; tunnels lead to valves XO, ZJ, ZL
+Valve VS has flow rate=0; tunnels lead to valves XL, VD
+Valve TI has flow rate=0; tunnels lead to valves LN, CG
+Valve VD has flow rate=17; tunnels lead to valves TR, VS, JI, GQ, VO
+Valve TX has flow rate=0; tunnels lead to valves FV, WR
+Valve HP has flow rate=0; tunnels lead to valves AX, ET
+Valve BK has flow rate=0; tunnels lead to valves PI, AD
+Valve ET has flow rate=0; tunnels lead to valves ZR, HP
+Valve VY has flow rate=0; tunnels lead to valves KU, LM
+Valve DZ has flow rate=0; tunnels lead to valves VO, AA
+Valve ZK has flow rate=0; tunnels lead to valves FR, ER
+Valve TG has flow rate=0; tunnels lead to valves GJ, AX
+Valve YI has flow rate=0; tunnels lead to valves JW, LM
+Valve XO has flow rate=0; tunnels lead to valves ZR, WI
+Valve ZR has flow rate=11; tunnels lead to valves KX, AZ, ET, LN, XO
+Valve EQ has flow rate=0; tunnels lead to valves RC, YJ
+Valve PI has flow rate=4; tunnels lead to valves BK, KX, VQ, EU, AV
+Valve VO has flow rate=0; tunnels lead to valves VD, DZ
+Valve WR has flow rate=0; tunnels lead to valves TX, RC
+Valve TF has flow rate=0; tunnels lead to valves FR, KU
+Valve FR has flow rate=22; tunnels lead to valves ZK, TF
+Valve MK has flow rate=0; tunnels lead to valves AJ, YW
+Valve AZ has flow rate=0; tunnels lead to valves GJ, ZR
+Valve TC has flow rate=0; tunnels lead to valves KU, RO
+Valve GQ has flow rate=0; tunnels lead to valves MF, VD
+Valve YW has flow rate=0; tunnels lead to valves MK, KU
+Valve AA has flow rate=0; tunnels lead to valves RO, EI, VJ, VQ, DZ
+Valve MF has flow rate=0; tunnels lead to valves QO, GQ
+Valve ZL has flow rate=0; tunnels lead to valves WI, FF
+Valve LM has flow rate=3; tunnels lead to valves YI, SU, UJ, VY, HF
+Valve KU has flow rate=9; tunnels lead to valves XL, TC, TF, VY, YW
+Valve FV has flow rate=23; tunnels lead to valves KV, TX
+Valve EU has flow rate=0; tunnels lead to valves PI, GJ
+Valve KV has flow rate=0; tunnels lead to valves FV, OF
+Valve QX has flow rate=0; tunnels lead to valves AJ, CG
+Valve RO has flow rate=0; tunnels lead to valves AA, TC
+Valve TR has flow rate=0; tunnels lead to valves VD, AJ
+Valve VQ has flow rate=0; tunnels lead to valves AA, PI
+Valve HF has flow rate=0; tunnels lead to valves JI, LM
+Valve RV has flow rate=0; tunnels lead to valves EI, CG
+Valve KX has flow rate=0; tunnels lead to valves PI, ZR
+Valve UJ has flow rate=0; tunnels lead to valves LM, VJ
+Valve AX has flow rate=5; tunnels lead to valves TG, AV, HP
+Valve XL has flow rate=0; tunnels lead to valves KU, VS
+Valve AD has flow rate=0; tunnels lead to valves BK, RC
+Valve EI has flow rate=0; tunnels lead to valves RV, AA
+Valve OF has flow rate=19; tunnel leads to valve KV
diff --git a/inputs/input.17 b/inputs/input.17
new file mode 100644
index 0000000..0369d6d
--- /dev/null
+++ b/inputs/input.17
@@ -0,0 +1 @@
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diff --git a/inputs/input.18 b/inputs/input.18
new file mode 100644
index 0000000..b28f2a4
--- /dev/null
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diff --git a/inputs/input.19 b/inputs/input.19
new file mode 100644
index 0000000..b68cf1b
--- /dev/null
+++ b/inputs/input.19
@@ -0,0 +1,30 @@
+Blueprint 1: Each ore robot costs 3 ore. Each clay robot costs 4 ore. Each obsidian robot costs 3 ore and 18 clay. Each geode robot costs 4 ore and 19 obsidian.
+Blueprint 2: Each ore robot costs 2 ore. Each clay robot costs 4 ore. Each obsidian robot costs 3 ore and 19 clay. Each geode robot costs 4 ore and 12 obsidian.
+Blueprint 3: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 12 clay. Each geode robot costs 3 ore and 8 obsidian.
+Blueprint 4: Each ore robot costs 2 ore. Each clay robot costs 4 ore. Each obsidian robot costs 3 ore and 19 clay. Each geode robot costs 4 ore and 13 obsidian.
+Blueprint 5: Each ore robot costs 2 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 17 clay. Each geode robot costs 3 ore and 10 obsidian.
+Blueprint 6: Each ore robot costs 3 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 17 clay. Each geode robot costs 4 ore and 8 obsidian.
+Blueprint 7: Each ore robot costs 4 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 7 clay. Each geode robot costs 2 ore and 7 obsidian.
+Blueprint 8: Each ore robot costs 3 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 6 clay. Each geode robot costs 3 ore and 16 obsidian.
+Blueprint 9: Each ore robot costs 3 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 19 clay. Each geode robot costs 3 ore and 17 obsidian.
+Blueprint 10: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 9 clay. Each geode robot costs 4 ore and 16 obsidian.
+Blueprint 11: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 2 ore and 7 clay. Each geode robot costs 4 ore and 18 obsidian.
+Blueprint 12: Each ore robot costs 3 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 20 clay. Each geode robot costs 2 ore and 12 obsidian.
+Blueprint 13: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 3 ore and 5 clay. Each geode robot costs 3 ore and 18 obsidian.
+Blueprint 14: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 3 ore and 7 clay. Each geode robot costs 4 ore and 11 obsidian.
+Blueprint 15: Each ore robot costs 4 ore. Each clay robot costs 3 ore. Each obsidian robot costs 2 ore and 14 clay. Each geode robot costs 2 ore and 7 obsidian.
+Blueprint 16: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 3 ore and 7 clay. Each geode robot costs 3 ore and 20 obsidian.
+Blueprint 17: Each ore robot costs 2 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 18 clay. Each geode robot costs 2 ore and 11 obsidian.
+Blueprint 18: Each ore robot costs 2 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 17 clay. Each geode robot costs 3 ore and 11 obsidian.
+Blueprint 19: Each ore robot costs 2 ore. Each clay robot costs 4 ore. Each obsidian robot costs 2 ore and 20 clay. Each geode robot costs 2 ore and 17 obsidian.
+Blueprint 20: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 5 clay. Each geode robot costs 3 ore and 7 obsidian.
+Blueprint 21: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 15 clay. Each geode robot costs 4 ore and 17 obsidian.
+Blueprint 22: Each ore robot costs 4 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 15 clay. Each geode robot costs 2 ore and 13 obsidian.
+Blueprint 23: Each ore robot costs 3 ore. Each clay robot costs 3 ore. Each obsidian robot costs 2 ore and 16 clay. Each geode robot costs 3 ore and 14 obsidian.
+Blueprint 24: Each ore robot costs 4 ore. Each clay robot costs 3 ore. Each obsidian robot costs 4 ore and 5 clay. Each geode robot costs 3 ore and 10 obsidian.
+Blueprint 25: Each ore robot costs 3 ore. Each clay robot costs 3 ore. Each obsidian robot costs 2 ore and 20 clay. Each geode robot costs 2 ore and 20 obsidian.
+Blueprint 26: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 14 clay. Each geode robot costs 2 ore and 16 obsidian.
+Blueprint 27: Each ore robot costs 3 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 8 clay. Each geode robot costs 2 ore and 10 obsidian.
+Blueprint 28: Each ore robot costs 3 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 8 clay. Each geode robot costs 2 ore and 12 obsidian.
+Blueprint 29: Each ore robot costs 4 ore. Each clay robot costs 4 ore. Each obsidian robot costs 4 ore and 8 clay. Each geode robot costs 2 ore and 15 obsidian.
+Blueprint 30: Each ore robot costs 3 ore. Each clay robot costs 3 ore. Each obsidian robot costs 2 ore and 7 clay. Each geode robot costs 2 ore and 9 obsidian.
diff --git a/inputs/input.2 b/inputs/input.2
new file mode 100644
index 0000000..1485a1d
--- /dev/null
+++ b/inputs/input.2
@@ -0,0 +1,2500 @@
+A X
+C X
+C X
+C X
+B Y
+C X
+C X
+A Z
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+C Y
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+C Y
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+A Z
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+C X
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diff --git a/inputs/input.21 b/inputs/input.21
new file mode 100644
index 0000000..09a294a
--- /dev/null
+++ b/inputs/input.21
@@ -0,0 +1,1677 @@
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+flhf: 3
+whbb: 8
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+fwmw: jfqs + sgjm
+ngfs: ccbp * dphz
+mqfd: lpzb / ftzc
+lflj: vtdp * cjhz
+vzcr: jmqh + zbbf
diff --git a/inputs/input.22 b/inputs/input.22
new file mode 100644
index 0000000..c2ac1ec
--- /dev/null
+++ b/inputs/input.22
@@ -0,0 +1,202 @@
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diff --git a/inputs/input.4 b/inputs/input.4
new file mode 100644
index 0000000..0745f29
--- /dev/null
+++ b/inputs/input.4
@@ -0,0 +1,1000 @@
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diff --git a/inputs/input.5 b/inputs/input.5
new file mode 100644
index 0000000..7227e79
--- /dev/null
+++ b/inputs/input.5
@@ -0,0 +1,512 @@
+[S]                 [T] [Q]        
+[L]             [B] [M] [P]     [T]
+[F]     [S]     [Z] [N] [S]     [R]
+[Z] [R] [N]     [R] [D] [F]     [V]
+[D] [Z] [H] [J] [W] [G] [W]     [G]
+[B] [M] [C] [F] [H] [Z] [N] [R] [L]
+[R] [B] [L] [C] [G] [J] [L] [Z] [C]
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diff --git a/inputs/input.6 b/inputs/input.6
new file mode 100644
index 0000000..636557c
--- /dev/null
+++ b/inputs/input.6
@@ -0,0 +1 @@
+gzbzwzjwwrfftfrrbvvcbcvcffpssvhhzfzbfzzrbrtrcttnthnhsnhsnnclcpctpprwwgppppchhvvctvtsvswwcdcrrdzdhzdzvddvfvfjjlldvvfllfhlfhlhghnhghrgrsggvbbhdhffzggmttjqtjjgljjwtjwjggldlzzrfrpppjsjggqrrdbbgwgtwwwtqwtqqvccjnnhrhqqsnssjbssmjjbzjjqnqnlnjncjjzzqddfqqqnqvnqncqqmsshqqccssvpvllbbfvfmmmgzgdggtjgjtjbttngtnnhhfrfddmtmtftcftthvttwzwrzrbrgrbrqbqccmmtvtqvtqqzmzwmzzzsvzvhhhqlhqlqplpggvmvwmmshhnshsjszzljlnlrnllgddqllpmllsgswwqnqlnlqqlmqqvrqvrqrppvrrqwqhqllgjgcggsllqgllghlghhbvhhcvvbddvcvwwwzdzzfjjvcczbbwccjvccmvmfvfgfmfttwrttpmtmsszccjggcssmqsmsgszzfpphghvgvvcddtltwlwnnrbbfdbbtssrvvmwwjfflmlblwlrlmlwwhrhnhqnnvdvllzblzzndzdlzzhpprbrprnrzrjjlnlnrrjddgrrwrttcstsgshszzvgvfvpfpqfpfbpbfbwbmmzvvnnqvvqppzspzpzplldqlqsqlldmlmgmcmwmsmfsfzfdzzbpzzbbcwbbtppphlhshchjjszztctpprqppszzchcqczczddscsrstsntstjsjqjjfggvccgbggqhghrhppdldnlndnpddllgplgppnlpnnmwwglghhftfrtrqtqsszrssfjjzhzfhfssflfslsmmgrrcdrdnrdnnqznndrrbtrrmhrhbhsbsgsnslsqlqnncpccplpldpldppshsdssqdsqdsqdsdsdfsddchczhczcszcscffzhfzffpbbgttdhthnhnjnwnnwrrmwmlljzlzlzdzrrcvcbbsfstfsfnfqftqffgjfjzfjfsjswswccsvcvlccshhjpjcccnfnqqmsqmmrwmwjwswgsgjsjttmjmjttpqtqwttgmgfmmnbnrnpnwppgspggwnwqnqpqmmbmmnwnllbwwdqqzsqqtgttnrtrllcwcchpchcbhbpbnpbpsptpvtvzvrzzslljddjzjjmqmmdpmddcdzzrdrqddtctppwzzwrzrvzrvrzzjtztqqsmmcncllhmlmpmhgsrtrzjhjbtfvhmzpssfbjwcdshthnmmqmfhlhwcbbllwzbwfgfvzjcqblchzqqqgcgmpnbnnblhbcpgmvsbvtcmhsghldlhqlghgtpdvjflmjsmppdsvrjlwvhmwsmfvvdnzpmtfqjqpjdctnnrlfjfvdtmvdmhsczlfsqwfrqtlqwnzdzrcdzmhvrgwnjjtqjrqljhgcffglvhnsdssqdpfrfhtjwlqzvfjmpjnqhsjvndtstqjsqgcmgqdjvfqnlmtjlvcblndprmffrgqdnnncnlfflclgqbjbmsdqsjrmzpwtbqqqqsqmgthhjfqwzvcbqwlvdbffhcvncpldmchnptbnlbhmzrrjhzvzdrvtlhsnfnfdnvhlrlrmdcpnmvdwswctcqldszlvftqtwldrhmfjmfvcgjcdjsbjqjwdtslblwhqfvgrfcpnhszqqsfwbwcmvfvccvztdmcjqfjvdvmbdtcjvtwqpwsqjtdvpvvvsdrrvngmjztgjtnpdbmtlrbrjlwsdnthgzgpssgbzzrqvgblqhrtfbflnphvhpzmdfrwqvjjvcpsmdrqwdbzlpnqpmglgqzfhctrzdpzdthqgjtvpwcrlsmqnjwgzlnqbthvfswhjtrrsrswhbmnddgzmznvppbnmtjpzpdpmpzpmsgfstzldgmrtgplwwsbztphtcvdfgsqzqwrmlqpnhvpcqpfjpbrthrtwgqlfnrqcrpvhssjmhfgpnzzvlrlcbnpmddhtdvvfrrvprqrwbhfgvvltgrhrpwsdgvrlgthbztcgcfggtcfzqtlcdhpmcvpgcszslhpfrttnrdrqpqlgdfwtccmbhfrnlbhhmrtrjmzstbqhmtphzcpcllzsnghfvlwvzzvlqrjmfsvhrnjnvldgnbqvpjsmmphhrmhqrtcncmjwbdlqtrvmhgjrjsrddcpqnjhfmczfgwzspnrjfwvfdpdlcfpvctfrlspdwwlnpbvbglzsmgfsmrshsqgcvlfrvjssrglbwvvvgpvtqshbtqmzbnglflhhldtfzqssptrbnnzdqwqtstpftdqgmmhfjdlfwtmcmtmcgcvtfhzvsbllgbchvlhrgnvvbsnrwqrlvdqlcwwlgbjrvrzgcvljqzvdngtbhpnppjrzpmbwztzvnvrbfccfgvnqvrcmpdblngcvlwjwzpbbwmnslsdjmbrwbvnjsgcmsfvzvnwbzrrlzvgdnzcqqgggvmcwczjqnrddnzhlndgzjbvtbtjqdnlvlflqnfvjdmfstpdfqsgjdslgtpgdnvvpmfwvlqbmbgdrqjhdfhlmsdtfwpscsvdzmswszjfwqtsjqpfnjjlnsspvlgzwwtvwgdzfjjljfwbvfbvpglcqcdbdpshwcqzswbwhftbfqblzpqfmqpvzdjsrcqtvjntnhmlhmzllffcjsdnwpfzdglvlrhrljbrhjhgdnfcqcrccwrbbhrvqwrzlwjrrwzsfcwsvbqsjgtgpzqwlczljrtdhtzcgsfgqssdbjjmttdtzhrqtbqjtqfwmcpdftrfjmznpscsqmtfcdpcdjwcqjvmhngcqnmtmwfttcvpwgcnhhgnnbgjdvztzhczvqljjqwcmwcbvmqqjsfnmhtbtsvsnsfwfzgdvlctrgdvbjqpgfrrlsnppmvhfbbclprlvcssnvtsgftmlpqrpjzrrphrzltbtgfwjqqvbgqjdpdgqvzppfzcbhdbbjttcdzclsphtlzfvnfqgpmqvpzrqgpdnbmsrqgsnfdwpvndzmsllgmnrlhnnzldwshtrrsrsmdncwrcjnmcjlwbbfpzcwzvldtgvbcvhnbhgjgwjcvslrfcwbqlrqldvpcgnbwbzzncncftrgbrwchfrrtnpqsjbcpzvplnbqdgtvnnrcwwfvbdzdrsfspvtbhflhsbqmlsjvfmpvjbfvcrdmgrfqsmqgfrntfqnlqbvmsqtpncjrstspbqvfmddmhwsssdcddshmwdlscttmdzljtpwhzhzhwsdnmgjstfmlnqqvzzdqpqsjdsllswmqcjtnthwqnhbscrjdstljqgncjvjvlpfrtscrzrqghrdvdnbtnpshpldcchljzrzqjlwwscnphvrwlvzttcdjdrddgmvqpvdmttdqhwpfmslzvnrwlrrdttbhctgpgzjrmdwjbcmsprwggvmdmmltldgpbfnppnrpwcnpgtblccdvbsnfvgzmjppftvndmdslfshjvndfvvzjjlzhgfmhcggttrcrbrlwrqgjpchvhnjwqnbsnmftwszhzftglrfdvvnbcbzsslgmdchtrrrqqzhllrfhwfwbbdgfpdfwssmzcfcnzmrhfdddtdhfqmctsglqbwhwpnbdzbsfbbvvthrrgjvztjjwgjcgjntrddmmdldtmvjnwjbcqwfwvfhsrpchznhlqpcttqjffbrpbftftdjzlrqchmzrfgjrqlndfwfrghtsfsblcvtjmjrbfrwdgsgzmmjpdlbwzfscfsfcdqwdwnjwjbvvbptmfrqltmnlpbtrqspwdfmhnncqgtrtmbzhfmwrbcqhmmpmvprvwrjplspcmmspldmbgpbtmqjtrfcpfhcnpjbnlhjpzflstjqfqvzcnfgvrmtplndchffzrtfrqdpdnzrspddwmpzlfchrzzfcfvmbvfnlfwtfbvnffdqhljbvwwdtmszgrjtzwqdbgvvfphcnsdgvlmslqngfmsbrztrnpjprghmjffscbnfqwrvjjjtfzrmjtzbwdsmzgmbtjzvddhngmzvflwftblbzfd
diff --git a/inputs/input.7 b/inputs/input.7
new file mode 100644
index 0000000..efd9044
--- /dev/null
+++ b/inputs/input.7
@@ -0,0 +1,1030 @@
+$ cd /
+$ ls
+dir bhtvbj
+dir bmlllrl
+dir dhm
+dir mnp
+dir nwqgchw
+$ cd bhtvbj
+$ ls
+dir dmd
+dir fjblqtdp
+25595 mdmtpjq.wmf
+dir qhm
+dir rjr
+dir smtrp
+dir tbdsml
+$ cd dmd
+$ ls
+232616 ngmqbc.mdj
+75367 vqqcvgts.vrc
+$ cd ..
+$ cd fjblqtdp
+$ ls
+dir czvcf
+dir jnzwf
+245590 lcpgtrc.dqm
+141631 nwqgchw
+37152 nwqgchw.ppg
+80432 rbj.twt
+$ cd czvcf
+$ ls
+dir cqzcp
+dir czvcf
+$ cd cqzcp
+$ ls
+dir bshmsns
+55418 svhphd
+232179 vqqcvgts.vrc
+$ cd bshmsns
+$ ls
+243135 rbhprlgq.gbh
+$ cd ..
+$ cd ..
+$ cd czvcf
+$ ls
+158882 lhfsc.lrh
+266626 ntsrpn
+$ cd ..
+$ cd ..
+$ cd jnzwf
+$ ls
+108142 btmz
+$ cd ..
+$ cd ..
+$ cd qhm
+$ ls
+162986 bnqbdmm.dfh
+dir hqbhr
+201987 hwvdlfl
+dir lvdrr
+143900 nwcjvb
+dir rgtcchh
+297583 wdcsgg.cjt
+$ cd hqbhr
+$ ls
+175196 btmz
+dir fcm
+221851 ngmqbc
+dir qnlssvn
+263872 rdzsz.grd
+dir vvbgt
+dir wwzwqqh
+$ cd fcm
+$ ls
+66471 sfddtgp.flr
+$ cd ..
+$ cd qnlssvn
+$ ls
+dir czvcf
+dir gngvc
+75812 lbthznl.llq
+182104 nwqgchw.nlq
+161446 rrvwdw.nzv
+dir rzssqpcj
+260877 wdcsgg.cjt
+$ cd czvcf
+$ ls
+202850 vqqcvgts.vrc
+$ cd ..
+$ cd gngvc
+$ ls
+154834 rdzsz.hst
+$ cd ..
+$ cd rzssqpcj
+$ ls
+66116 bdzdp
+$ cd ..
+$ cd ..
+$ cd vvbgt
+$ ls
+288775 cpsmvwq
+dir fbfddwqz
+81857 jcpj.wpf
+dir nwjps
+49905 tlrlbg.mgz
+64870 wdcsgg.cjt
+131013 zbc.rhl
+$ cd fbfddwqz
+$ ls
+100619 wdcsgg.cjt
+$ cd ..
+$ cd nwjps
+$ ls
+96526 cjrvb.tdv
+$ cd ..
+$ cd ..
+$ cd wwzwqqh
+$ ls
+dir czvcf
+$ cd czvcf
+$ ls
+256121 nrjfpjc.wcg
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lvdrr
+$ ls
+27488 lhfsc.lrh
+$ cd ..
+$ cd rgtcchh
+$ ls
+19285 bfdfz.rln
+166070 btmz
+222301 vqqcvgts.vrc
+$ cd ..
+$ cd ..
+$ cd rjr
+$ ls
+dir dbb
+121292 drv.ljf
+dir ntbbd
+228025 rphtjh.ngl
+133033 wrlwdgz
+$ cd dbb
+$ ls
+158756 btmz
+130326 czvcf.trn
+dir fdgh
+dir grr
+20181 wdcsgg.cjt
+$ cd fdgh
+$ ls
+24629 rph.rsl
+299233 wdcsgg.cjt
+$ cd ..
+$ cd grr
+$ ls
+259732 tqvvp
+$ cd ..
+$ cd ..
+$ cd ntbbd
+$ ls
+dir cwwhvghw
+dir hggcq
+169994 jrvt.srj
+dir jtzbw
+dir ptr
+215668 smcngpwr
+dir tfshcbw
+$ cd cwwhvghw
+$ ls
+dir czvcf
+167719 dzltv
+dir mdgqwdjq
+265831 pcfcw.jrd
+86965 qsdv
+71709 tdbtjwzp.msg
+dir vtbr
+$ cd czvcf
+$ ls
+dir ntj
+dir nwqgchw
+dir rdzsz
+202867 vqqcvgts.vrc
+$ cd ntj
+$ ls
+214072 ntplhvnn.zpt
+$ cd ..
+$ cd nwqgchw
+$ ls
+228489 qfphslzt
+15383 zfpdpds.bjt
+$ cd ..
+$ cd rdzsz
+$ ls
+dir jrvt
+6415 jrvt.vjt
+290773 mhfwsc.nlr
+82027 wdcsgg.cjt
+$ cd jrvt
+$ ls
+85079 mnq.jvr
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mdgqwdjq
+$ ls
+223814 phghj
+172175 wwpvcb
+$ cd ..
+$ cd vtbr
+$ ls
+134023 frwc.dhg
+26692 fvgscmns.mpj
+148404 wnlgfmdr.dch
+$ cd ..
+$ cd ..
+$ cd hggcq
+$ ls
+19064 btmz
+200043 lswzn
+dir mlrj
+49427 rcwmzz.nsn
+dir wjznmcw
+$ cd mlrj
+$ ls
+10869 czvcf.fvc
+277796 gprlsg.tbt
+$ cd ..
+$ cd wjznmcw
+$ ls
+43168 bzwn
+dir dznz
+4102 lcpgtrc.dqm
+dir ltcpgcdf
+228100 nwqgchw.mgc
+dir tbdqsnb
+dir tmzswrgt
+19984 whgmsm.bjj
+$ cd dznz
+$ ls
+59403 msqdt.mlm
+$ cd ..
+$ cd ltcpgcdf
+$ ls
+dir czvcf
+10727 jgphjm.pdw
+309167 nwqgchw
+dir pwbt
+dir qznbn
+203154 ztpcdmb.rrs
+$ cd czvcf
+$ ls
+173609 pntjz.vzq
+292292 trvbpz.djc
+111008 wdcsgg.cjt
+107437 wjvv.hsj
+265353 wsbff.pzh
+$ cd ..
+$ cd pwbt
+$ ls
+307172 jtdtlbsh
+dir lgz
+$ cd lgz
+$ ls
+dir fnlsq
+$ cd fnlsq
+$ ls
+161356 jrvt.ljb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qznbn
+$ ls
+12354 bdgvj
+59582 cslzb.qnq
+dir czvcf
+dir psnpf
+136432 vlsswwgv
+99861 vqqcvgts.vrc
+39898 wzllwpmr.mqc
+$ cd czvcf
+$ ls
+dir dqnpjjrv
+13244 ztcpzzr
+$ cd dqnpjjrv
+$ ls
+233675 ngmqbc.srp
+$ cd ..
+$ cd ..
+$ cd psnpf
+$ ls
+1986 lhfsc.lrh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd tbdqsnb
+$ ls
+170099 hbcnv.gmj
+$ cd ..
+$ cd tmzswrgt
+$ ls
+118969 btmz
+dir czvcf
+51649 hbb.jcb
+$ cd czvcf
+$ ls
+163330 hhcf
+159514 wdhw
+22876 wtn.pnb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jtzbw
+$ ls
+55634 rdzsz.dgf
+$ cd ..
+$ cd ptr
+$ ls
+49447 wdcsgg.cjt
+$ cd ..
+$ cd tfshcbw
+$ ls
+193480 btmz
+44402 sjsgfmts.dtc
+115952 vqncb.ssf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd smtrp
+$ ls
+dir hlpzdbwp
+307696 jrvt.hds
+300691 lcpgtrc.dqm
+dir nflt
+dir qcph
+dir qlrdf
+$ cd hlpzdbwp
+$ ls
+dir czvcf
+dir frzvnrb
+dir jrvt
+$ cd czvcf
+$ ls
+155141 lcpgtrc.dqm
+$ cd ..
+$ cd frzvnrb
+$ ls
+71241 btmz
+dir rdzsz
+dir vdb
+$ cd rdzsz
+$ ls
+35362 jngsmcrm.pwt
+$ cd ..
+$ cd vdb
+$ ls
+239928 jrvt.nbf
+16883 ngmqbc
+$ cd ..
+$ cd ..
+$ cd jrvt
+$ ls
+dir lcchtcz
+$ cd lcchtcz
+$ ls
+199091 qzsh.fst
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd nflt
+$ ls
+219987 nwqgchw.qpf
+dir rdzsz
+257069 wdcsgg.cjt
+$ cd rdzsz
+$ ls
+dir zmgf
+$ cd zmgf
+$ ls
+dir vwcvbff
+$ cd vwcvbff
+$ ls
+157598 qsp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qcph
+$ ls
+158708 cdj.bch
+dir drdpdzj
+dir jrvt
+109459 lhfsc.lrh
+dir ngmqbc
+164488 rtnvpg
+23729 vqqcvgts.vrc
+115775 wdcsgg.cjt
+$ cd drdpdzj
+$ ls
+dir ngwcr
+dir pwffm
+dir vcclwq
+$ cd ngwcr
+$ ls
+76003 rqjbn
+84407 vqqcvgts.vrc
+$ cd ..
+$ cd pwffm
+$ ls
+284565 rzdjrmn.jdz
+$ cd ..
+$ cd vcclwq
+$ ls
+137044 czvcf.qll
+3433 nwqgchw
+18027 vqqcvgts.vrc
+$ cd ..
+$ cd ..
+$ cd jrvt
+$ ls
+57605 vljs
+$ cd ..
+$ cd ngmqbc
+$ ls
+217554 btmz
+96485 lhfsc.lrh
+dir lpcr
+dir sltwgmjv
+dir snll
+dir tsq
+218323 vqqcvgts.vrc
+150009 wdcsgg.cjt
+$ cd lpcr
+$ ls
+227650 qhfz.grc
+$ cd ..
+$ cd sltwgmjv
+$ ls
+39536 fncjl.vlr
+248067 lcpgtrc.dqm
+$ cd ..
+$ cd snll
+$ ls
+70368 btmz
+195228 svmdc.pcv
+$ cd ..
+$ cd tsq
+$ ls
+271904 vqqcvgts.vrc
+104043 wbgwpcl
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qlrdf
+$ ls
+dir dqgln
+dir ngmqbc
+dir ntngh
+$ cd dqgln
+$ ls
+dir qdrszjvm
+$ cd qdrszjvm
+$ ls
+199245 lcpgtrc.dqm
+$ cd ..
+$ cd ..
+$ cd ngmqbc
+$ ls
+171851 czvcf.jft
+dir ngmqbc
+dir qdffn
+$ cd ngmqbc
+$ ls
+14596 jjhmhzs.dww
+$ cd ..
+$ cd qdffn
+$ ls
+dir czvcf
+$ cd czvcf
+$ ls
+130227 jhqhd.fdz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ntngh
+$ ls
+243908 bqjfjnl.pcl
+112351 btmz
+30167 lcpgtrc.dqm
+249181 mfwcvc.zdg
+dir qlhw
+157482 vqqcvgts.vrc
+$ cd qlhw
+$ ls
+267233 gfhthp.prr
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd tbdsml
+$ ls
+44152 btmz
+143454 cpzlrsh
+47848 crdvhbt.dfr
+dir gvjhlqdd
+171842 mgljcrw.trm
+dir nqsq
+dir rdzsz
+$ cd gvjhlqdd
+$ ls
+177040 ffbm
+$ cd ..
+$ cd nqsq
+$ ls
+dir fchtl
+dir jrvt
+dir nsgbjwbt
+dir qcz
+dir vqlnqvwn
+55184 wlspgz
+dir wzm
+dir zpw
+$ cd fchtl
+$ ls
+193793 btmz
+164089 jrvt.hzn
+53839 lpv.gtg
+dir qmfwds
+dir sqznc
+dir tdqg
+dir zvd
+$ cd qmfwds
+$ ls
+dir dqtbp
+236341 lcpgtrc.dqm
+101548 rdzsz.vqr
+180341 wzpdq.gjr
+$ cd dqtbp
+$ ls
+56177 hdgnthn.dff
+56834 jrvt.nmg
+$ cd ..
+$ cd ..
+$ cd sqznc
+$ ls
+282988 dpdfvn.spw
+248737 tzfd.pfd
+$ cd ..
+$ cd tdqg
+$ ls
+251266 rdzsz.dhb
+$ cd ..
+$ cd zvd
+$ ls
+124979 ngmqbc
+$ cd ..
+$ cd ..
+$ cd jrvt
+$ ls
+206684 dbbppj.sds
+189832 jvst.fzr
+$ cd ..
+$ cd nsgbjwbt
+$ ls
+32810 btmz
+$ cd ..
+$ cd qcz
+$ ls
+dir bjbsl
+dir brvgznjr
+98771 btmz
+dir gbfhz
+dir ngmqbc
+88248 rccpzctp.gwn
+dir rdzsz
+39060 tqswrdh.wfc
+dir ztnv
+$ cd bjbsl
+$ ls
+1312 rdzsz.qtl
+$ cd ..
+$ cd brvgznjr
+$ ls
+98988 lhfsc.lrh
+$ cd ..
+$ cd gbfhz
+$ ls
+96203 hgldz
+28558 nwqgchw
+dir qrzd
+240140 wjww.hjf
+$ cd qrzd
+$ ls
+231108 hjfcwvtq
+$ cd ..
+$ cd ..
+$ cd ngmqbc
+$ ls
+dir cpjvd
+dir vrbfcwc
+$ cd cpjvd
+$ ls
+142549 btmz
+dir ngmqbc
+$ cd ngmqbc
+$ ls
+62008 vqqcvgts.vrc
+$ cd ..
+$ cd ..
+$ cd vrbfcwc
+$ ls
+dir czj
+$ cd czj
+$ ls
+48640 btmz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rdzsz
+$ ls
+dir czvcf
+dir fmgmgmp
+dir jrvt
+308389 lhfsc.lrh
+dir nfdh
+dir ptgsd
+dir qmg
+244691 vqqcvgts.vrc
+$ cd czvcf
+$ ls
+dir fqjrb
+dir jbtgpl
+dir jstzjf
+299095 lcpgtrc.dqm
+122426 lhfsc.lrh
+dir wczwphjh
+219013 wdcsgg.cjt
+$ cd fqjrb
+$ ls
+dir fpspthg
+dir hdmtsv
+118041 mwlsw.fvs
+dir rdzsz
+99976 wdcsgg.cjt
+$ cd fpspthg
+$ ls
+280707 hmwsq
+$ cd ..
+$ cd hdmtsv
+$ ls
+102842 btmz
+72949 fpzqpqb.zjp
+$ cd ..
+$ cd rdzsz
+$ ls
+36159 sjtwbsvc
+$ cd ..
+$ cd ..
+$ cd jbtgpl
+$ ls
+139817 lhfsc.lrh
+139333 nwqgchw.wrz
+$ cd ..
+$ cd jstzjf
+$ ls
+dir gngbnq
+54929 lcpgtrc.dqm
+dir pdbdwmc
+$ cd gngbnq
+$ ls
+dir bfvsz
+dir pndfrjhz
+$ cd bfvsz
+$ ls
+283370 mdf.wvc
+$ cd ..
+$ cd pndfrjhz
+$ ls
+252824 lhfsc.lrh
+$ cd ..
+$ cd ..
+$ cd pdbdwmc
+$ ls
+dir nwqgchw
+dir sdmfntl
+266823 vqqcvgts.vrc
+$ cd nwqgchw
+$ ls
+dir bnfhbvmr
+$ cd bnfhbvmr
+$ ls
+62602 lrmmtjmv
+$ cd ..
+$ cd ..
+$ cd sdmfntl
+$ ls
+93365 njfgsgm.jtv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd wczwphjh
+$ ls
+164840 lcpgtrc.dqm
+$ cd ..
+$ cd ..
+$ cd fmgmgmp
+$ ls
+292610 jglzqc.mss
+dir rdzsz
+dir rrrjw
+$ cd rdzsz
+$ ls
+295660 lcpgtrc.dqm
+$ cd ..
+$ cd rrrjw
+$ ls
+dir lsc
+$ cd lsc
+$ ls
+280045 dljtrq.tll
+dir nwqgchw
+$ cd nwqgchw
+$ ls
+162525 lhfsc.lrh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jrvt
+$ ls
+227518 pcsqv
+$ cd ..
+$ cd nfdh
+$ ls
+304769 ngmqbc.qhd
+$ cd ..
+$ cd ptgsd
+$ ls
+281593 cpfzhhd
+123541 hhlhssqb.szt
+250182 lcpgtrc.dqm
+dir ngmqbc
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+$ cd wntfhzqf
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+$ cd jnl
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+$ ls
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+dir mqhz
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+$ cd ..
+$ cd ..
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+dir tbbp
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+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
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+$ ls
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diff --git a/main.go b/main.go
new file mode 100644
index 0000000..43bf46b
--- /dev/null
+++ b/main.go
@@ -0,0 +1,88 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/acw/advent2022/solutions/day1"
+	"github.com/acw/advent2022/solutions/day10"
+	"github.com/acw/advent2022/solutions/day11"
+	"github.com/acw/advent2022/solutions/day12"
+	"github.com/acw/advent2022/solutions/day13"
+	"github.com/acw/advent2022/solutions/day14"
+	"github.com/acw/advent2022/solutions/day15"
+	"github.com/acw/advent2022/solutions/day16"
+	"github.com/acw/advent2022/solutions/day17"
+	"github.com/acw/advent2022/solutions/day18"
+	"github.com/acw/advent2022/solutions/day19"
+	"github.com/acw/advent2022/solutions/day2"
+	"github.com/acw/advent2022/solutions/day20"
+	"github.com/acw/advent2022/solutions/day21"
+	"github.com/acw/advent2022/solutions/day22"
+	"github.com/acw/advent2022/solutions/day23"
+	"github.com/acw/advent2022/solutions/day3"
+	"github.com/acw/advent2022/solutions/day4"
+	"github.com/acw/advent2022/solutions/day5"
+	"github.com/acw/advent2022/solutions/day6"
+	"github.com/acw/advent2022/solutions/day7"
+	"github.com/acw/advent2022/solutions/day8"
+	"github.com/acw/advent2022/solutions/day9"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		fmt.Println("USAGE: advent2022 [dayNN] [input]...")
+		return
+	}
+
+	switch os.Args[1] {
+	case "day1":
+		day1.Run(os.Args[2])
+	case "day2":
+		day2.Run(os.Args[2])
+	case "day3":
+		day3.Run(os.Args[2])
+	case "day4":
+		day4.Run(os.Args[2])
+	case "day5":
+		day5.Run(os.Args[2], os.Args[2])
+	case "day6":
+		day6.Run(os.Args[2], os.Args[2])
+	case "day7":
+		day7.Run(os.Args[2])
+	case "day8":
+		day8.Run(os.Args[2])
+	case "day9":
+		day9.Run(os.Args[2], os.Args[2])
+	case "day10":
+		day10.Run(os.Args[2])
+	case "day11":
+		day11.Run(os.Args[2])
+	case "day12":
+		day12.Run(os.Args[2])
+	case "day13":
+		day13.Run(os.Args[2])
+	case "day14":
+		day14.Run(os.Args[2])
+	case "day15":
+		day15.Run(os.Args[2], os.Args[3], os.Args[4])
+	case "day16":
+		day16.Run(os.Args[2])
+	case "day17":
+		day17.Run(os.Args[2], os.Args[3])
+	case "day18":
+		day18.Run(os.Args[2])
+	case "day19":
+		day19.Run(os.Args[2])
+	case "day20":
+		day20.Run(os.Args[2], os.Args[3], os.Args[4])
+	case "day21":
+		day21.Run(os.Args[2])
+	case "day22":
+		day22.Run(os.Args[2])
+	case "day23":
+		day23.Run(os.Args[2])
+	default:
+		fmt.Println("PANIC! Unknown day.")
+	}
+}
diff --git a/run b/run
new file mode 100644
index 0000000..5a899be
--- /dev/null
+++ b/run
@@ -0,0 +1,6446 @@
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+Point {7 6 1} had 4 blank sides.
+Point {7 10 14} had 0 blank sides.
+Point {9 13 4} had 0 blank sides.
+Point {4 6 14} had 1 blank sides.
+Point {16 12 8} had 0 blank sides.
+Point {6 6 4} had 0 blank sides.
+Point {7 10 4} had 0 blank sides.
+Point {12 6 11} had 0 blank sides.
+Point {10 5 17} had 1 blank sides.
+Point {8 10 18} had 2 blank sides.
+Point {4 9 15} had 0 blank sides.
+Point {4 6 3} had 3 blank sides.
+Point {11 2 10} had 0 blank sides.
+Point {14 9 10} had 0 blank sides.
+Point {14 8 9} had 0 blank sides.
+Point {15 9 10} had 0 blank sides.
+Point {15 10 8} had 0 blank sides.
+Point {7 12 14} had 0 blank sides.
+Point {4 14 6} had 1 blank sides.
+Point {14 13 7} had 0 blank sides.
+Point {15 4 13} had 3 blank sides.
+Point {4 8 9} had 0 blank sides.
+Point {5 8 11} had 0 blank sides.
+Point {7 13 18} had 6 blank sides.
+Point {12 12 9} had 0 blank sides.
+Point {15 12 8} had 0 blank sides.
+Point {17 7 12} had 0 blank sides.
+Point {14 14 9} had 0 blank sides.
+Point {16 13 6} had 0 blank sides.
+Point {11 9 15} had 0 blank sides.
+Point {4 3 10} had 2 blank sides.
+Point {17 12 5} had 4 blank sides.
+Point {11 18 12} had 3 blank sides.
+Point {6 14 8} had 0 blank sides.
+Point {8 11 8} had 0 blank sides.
+Point {12 13 15} had 0 blank sides.
+Point {6 8 18} had 3 blank sides.
+Point {6 17 8} had 2 blank sides.
+Point {13 2 10} had 0 blank sides.
+Point {17 8 8} had 0 blank sides.
+Point {3 9 12} had 0 blank sides.
+Point {14 5 6} had 0 blank sides.
+Point {15 9 6} had 0 blank sides.
+Point {12 9 17} had 0 blank sides.
+Point {5 6 16} had 0 blank sides.
+Point {12 11 9} had 0 blank sides.
+Point {4 8 5} had 0 blank sides.
+Point {14 3 10} had 0 blank sides.
+Point {6 3 13} had 0 blank sides.
+Point {6 10 7} had 0 blank sides.
+Point {14 10 11} had 0 blank sides.
+Point {11 7 2} had 1 blank sides.
+Point {16 13 11} had 0 blank sides.
+Point {16 8 11} had 0 blank sides.
+Point {14 16 5} had 2 blank sides.
+Point {14 8 5} had 0 blank sides.
+Point {9 15 9} had 0 blank sides.
+Point {13 7 6} had 0 blank sides.
+Point {3 4 9} had 2 blank sides.
+Point {13 7 15} had 0 blank sides.
+Point {15 8 4} had 0 blank sides.
+Point {4 12 5} had 0 blank sides.
+Point {6 13 8} had 0 blank sides.
+Point {7 11 13} had 0 blank sides.
+Point {13 6 6} had 0 blank sides.
+Point {9 1 8} had 1 blank sides.
+Point {6 4 13} had 0 blank sides.
+Point {10 14 4} had 0 blank sides.
+Point {2 6 7} had 3 blank sides.
+Point {4 12 16} had 3 blank sides.
+Point {9 4 5} had 0 blank sides.
+Point {14 7 16} had 2 blank sides.
+Point {14 9 6} had 0 blank sides.
+Point {6 15 14} had 1 blank sides.
+Point {9 17 11} had 0 blank sides.
+Point {13 7 14} had 0 blank sides.
+Point {14 12 15} had 0 blank sides.
+Point {3 5 12} had 0 blank sides.
+Point {17 10 11} had 0 blank sides.
+Point {12 4 3} had 3 blank sides.
+Point {11 6 10} had 0 blank sides.
+Point {11 8 5} had 0 blank sides.
+Point {11 14 8} had 0 blank sides.
+Point {8 2 11} had 1 blank sides.
+Point {5 4 10} had 0 blank sides.
+Point {9 3 5} had 0 blank sides.
+Point {11 5 2} had 2 blank sides.
+Point {8 5 13} had 0 blank sides.
+Point {7 10 6} had 0 blank sides.
+Found 2046 blank sides after filling interior.
diff --git a/solutions/day1/day1.go b/solutions/day1/day1.go
new file mode 100644
index 0000000..cffd689
--- /dev/null
+++ b/solutions/day1/day1.go
@@ -0,0 +1,59 @@
+package day1
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+)
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	var elf_totals []int
+	var current_total int
+	var max_total int
+
+	max_total = 0
+	for scanner.Scan() {
+		num, err := strconv.Atoi(scanner.Text())
+
+		if err == nil {
+			current_total += num
+		} else {
+			// this means we got a newline, I'd guess
+			elf_totals = append(elf_totals, current_total)
+
+			if current_total > max_total {
+				max_total = current_total
+			}
+
+			current_total = 0
+		}
+	}
+
+	if current_total > 0 {
+		elf_totals = append(elf_totals, current_total)
+		if current_total > max_total {
+			max_total = current_total
+		}
+	}
+
+	file.Close()
+
+	fmt.Println("Maximum food value is", max_total)
+	sort.Slice(elf_totals, func(i, j int) bool {
+		return elf_totals[i] > elf_totals[j]
+	})
+	fmt.Println("Top three items are", elf_totals[0:3])
+	fmt.Println("which adds to", elf_totals[0]+elf_totals[1]+elf_totals[2])
+}
diff --git a/solutions/day10/day10.go b/solutions/day10/day10.go
new file mode 100644
index 0000000..b6b5626
--- /dev/null
+++ b/solutions/day10/day10.go
@@ -0,0 +1,98 @@
+package day10
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func clearLine(line *[]rune) {
+	for idx := range *line {
+		(*line)[idx] = '.'
+	}
+}
+
+func printLine(line *[]rune) {
+	for _, c := range *line {
+		fmt.Printf("%c", c)
+	}
+	fmt.Println()
+}
+
+func registerCycle(cycle int, x int, line *[]rune) int {
+	result := 0
+	var position int
+
+	for position = cycle - 1; position > 40; position -= 40 {
+	}
+
+	if cycle == 20 || (cycle > 20 && ((cycle-20)%40 == 0)) {
+		result = x * cycle
+		//fmt.Println("register cycle", cycle, "value of x is", x, "signal strength is", result)
+	}
+
+	//if position == 0 {
+	//	fmt.Println("position is", position, "and x is", x)
+	//}
+
+	if position >= x-1 && position <= x+1 {
+		(*line)[position] = '#'
+	}
+
+	if position == 40 {
+		printLine(line)
+		clearLine(line)
+	}
+
+	return result
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	cycle := 1
+	x := 1
+	signalStrengthSum := 0
+	currentLine := []rune{'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.'}
+	if len(currentLine) != 40 {
+		fmt.Println("line length", len(currentLine))
+		return
+	}
+
+	registerCycle(cycle, x, &currentLine)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if strings.HasPrefix(line, "addx ") {
+			cycle += 1
+			signalStrengthSum += registerCycle(cycle, x, &currentLine)
+			cycle += 1
+			mod, err := strconv.Atoi(string(line[5:]))
+			if err != nil {
+				fmt.Println("Invalid x modifier", err, "having read", string(line[5:]))
+				return
+			}
+			x += mod
+			signalStrengthSum += registerCycle(cycle, x, &currentLine)
+		} else if strings.HasPrefix(line, "noop") {
+			cycle += 1
+			signalStrengthSum += registerCycle(cycle, x, &currentLine)
+		} else {
+			fmt.Println("PANIC: Unknown instruction:", line)
+			return
+		}
+	}
+
+	file.Close()
+	//printLine(line)
+
+	fmt.Println("Signal strength fun", signalStrengthSum)
+}
diff --git a/solutions/day11/day11.go b/solutions/day11/day11.go
new file mode 100644
index 0000000..2653736
--- /dev/null
+++ b/solutions/day11/day11.go
@@ -0,0 +1,226 @@
+package day11
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Operation int
+
+const (
+	Times Operation = iota
+	Plus
+	Square
+)
+
+type Monkey struct {
+	items        []int
+	operation    Operation
+	operation_by int
+	divisible_by int
+	if_true      int
+	if_false     int
+}
+
+func printMonkeys(monkeys []*Monkey) {
+	for monkey_no, monkey := range monkeys {
+		if monkey != nil {
+			fmt.Printf("Monkey #%d: ", monkey_no)
+			var items []int = (*monkey).items
+			for idx, item := range items {
+				fmt.Printf("%d", item)
+				if idx != len(items)-1 {
+					fmt.Printf(", ")
+				}
+			}
+			fmt.Println()
+		}
+	}
+}
+
+func lcm(items []int) int {
+	worstCase := 1
+	smallest := items[0]
+	for _, val := range items {
+		worstCase *= val
+		if val < smallest {
+			smallest = val
+		}
+	}
+
+	retval := worstCase
+	for candidate := worstCase; candidate > 2; candidate -= smallest {
+		works := true
+		for _, val := range items {
+			works = works && (candidate%val == 0)
+		}
+		if works {
+			retval = candidate
+		}
+	}
+
+	return retval
+}
+
+func runRound(monkeys *[]*Monkey, counts *[]int, ceiling int) {
+	//three := big.NewInt(3)
+	for monkey_no, monkey := range *monkeys {
+		if monkey == nil {
+			break
+		}
+		//fmt.Printf("Monkey %d:\n", monkey_no)
+		items := (*monkey).items
+		(*monkey).items = []int{}
+		for _, item := range items {
+			(*counts)[monkey_no] += 1
+			//fmt.Printf("  Monkey inspects an item with a worry level of %d.\n", item)
+			var result int = item
+			switch monkey.operation {
+			case Times:
+				result = item * monkey.operation_by
+				//fmt.Printf("   Worry level is multiplied by %d to %d.\n", monkey.operation_by, result)
+			case Square:
+				result = item * item
+				//fmt.Printf("   Worry level is squared to %d.\n", result)
+			case Plus:
+				result = item + monkey.operation_by
+				//fmt.Printf("   Worry level is increased by %d to %d.\n", monkey.operation_by, result)
+			default:
+				//fmt.Printf("PANIC: Don't understand operation\n", monkey.operation_by)
+				return
+			}
+			result %= ceiling
+			//result = result.Div(result, three)
+			//fmt.Printf("   Monkey gets bored with item. Worry level is divided by 3 to %d.\n", result)
+			var targetMonkey int
+
+			if result%monkey.divisible_by == 0 {
+				//fmt.Printf("   Current worry level is divisible by %d.\n", monkey.divisible_by)
+				targetMonkey = monkey.if_true
+			} else {
+				//fmt.Printf("   Current worry level is not divisible by %d.\n", monkey.divisible_by)
+				targetMonkey = monkey.if_false
+			}
+			//fmt.Printf("   Item with worry level %d is thrown to monkey %d.\n", result, targetMonkey)
+			(*monkeys)[targetMonkey].items = append((*monkeys)[targetMonkey].items, result)
+		}
+	}
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	monkeys := []*Monkey{nil, nil, nil, nil, nil, nil, nil, nil}
+	inspectionCounts := []int{0, 0, 0, 0, 0, 0, 0, 0}
+	divisors := []int{}
+	var currentMonkey *Monkey = nil
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if strings.HasPrefix(line, "Monkey ") {
+			number, err := strconv.Atoi(line[7 : len(line)-1])
+			if err != nil {
+				fmt.Println("Error parsing monkey number", line[7:len(line)-1])
+				return
+			}
+
+			newMonkey := Monkey{[]int{}, Times, 0, 0, 0, 0}
+			monkeys[number] = &newMonkey
+			currentMonkey = &newMonkey
+		} else if strings.HasPrefix(line, "  Starting items: ") {
+			list := line[18:]
+			splits := strings.Split(list, ", ")
+			if currentMonkey == nil {
+				fmt.Println("Item list with no monkey")
+				return
+			}
+			for _, split := range splits {
+				splitInt, err := strconv.Atoi(split)
+				if err != nil {
+					fmt.Println("Error parsing monkey's item", split)
+					return
+				}
+				(*currentMonkey).items = append((*&currentMonkey).items, splitInt)
+			}
+		} else if strings.HasPrefix(line, "  Operation: new = old * ") {
+			amtString := line[25:]
+			if amtString == "old" {
+				(*currentMonkey).operation = Square
+			} else {
+				amt, err := strconv.Atoi(amtString)
+				if err != nil {
+					fmt.Println("Error parsing operation number", amtString)
+					return
+				}
+				(*&currentMonkey).operation = Times
+				(*&currentMonkey).operation_by = amt
+			}
+		} else if strings.HasPrefix(line, "  Operation: new = old + ") {
+			amtString := line[25:]
+			amt, err := strconv.Atoi(amtString)
+			if err != nil {
+				fmt.Println("Error parsing plus operation number", amtString)
+				return
+			}
+			(*&currentMonkey).operation = Plus
+			(*&currentMonkey).operation_by = amt
+		} else if strings.HasPrefix(line, "  Test: divisible by ") {
+			amtString := line[21:]
+			amt, err := strconv.Atoi(amtString)
+			if err != nil {
+				fmt.Println("Error parsing divisible by number", amtString)
+				return
+			}
+			(*&currentMonkey).divisible_by = amt
+			divisors = append(divisors, amt)
+		} else if strings.HasPrefix(line, "    If true: throw to monkey ") {
+			amtString := line[29:]
+			amt, err := strconv.Atoi(amtString)
+			if err != nil {
+				fmt.Println("Error parsing if true number", amtString)
+				return
+			}
+			(*&currentMonkey).if_true = amt
+		} else if strings.HasPrefix(line, "    If false: throw to monkey ") {
+			amtString := line[30:]
+			amt, err := strconv.Atoi(amtString)
+			if err != nil {
+				fmt.Println("Error parsing if false number", amtString)
+				return
+			}
+			(*&currentMonkey).if_false = amt
+		} else if len(line) == 0 {
+		} else {
+			fmt.Printf("Invalid line: '%s'\n", line)
+			return
+		}
+	}
+
+	ceiling := lcm(divisors)
+
+	printMonkeys(monkeys)
+	for i := 0; i < 10000; i++ {
+		if i%100 == 0 {
+			fmt.Println("Running round", i)
+		}
+		runRound(&monkeys, &inspectionCounts, ceiling)
+		//printMonkeys(monkeys)
+	}
+	for monkey_no, count := range inspectionCounts {
+		fmt.Printf("Monkey %d inspected items %d times\n", monkey_no, count)
+	}
+
+	file.Close()
+}
diff --git a/solutions/day12/day12.go b/solutions/day12/day12.go
new file mode 100644
index 0000000..245e81b
--- /dev/null
+++ b/solutions/day12/day12.go
@@ -0,0 +1,174 @@
+package day12
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+type Point struct {
+	x int
+	y int
+}
+
+func to_level(r rune) int {
+	return int(r - 'a')
+}
+
+func from_level(l int) rune {
+	return rune('a' + l)
+}
+
+func validMove(p1 Point, p2 Point, grid [][]int) bool {
+	if p2.x < 0 || p2.y < 0 || p2.x >= len(grid[0]) || p2.y >= len(grid) {
+		return false
+	}
+
+	diff := grid[p2.y][p2.x] - grid[p1.y][p1.x]
+	return (diff <= 1)
+}
+
+func updateDistances(grid [][]int, distances [][]int) bool {
+	y := 0
+	updatedSomething := false
+
+	for _, row := range distances {
+		for x := range row {
+			best := distances[y][x]
+			nexts := nextSteps(Point{x, y}, grid)
+
+			for _, next := range nexts {
+				if distances[next.y][next.x] != -1 {
+					if best == -1 || distances[next.y][next.x]+1 < best {
+						fmt.Println("Found a live one; at", Point{x, y}, "with score", distances[y][x], "going to", next, "with score", distances[next.y][next.x])
+						best = distances[next.y][next.x] + 1
+						updatedSomething = true
+					}
+				}
+			}
+
+			distances[y][x] = best
+		}
+		y += 1
+	}
+
+	return updatedSomething
+}
+
+func nextSteps(p Point, grid [][]int) []Point {
+	retval := []Point{}
+
+	// point above
+	above := Point{p.x, p.y - 1}
+	if validMove(p, above, grid) {
+		retval = append(retval, above)
+	}
+	// point below
+	below := Point{p.x, p.y + 1}
+	if validMove(p, below, grid) {
+		retval = append(retval, below)
+	}
+	// point left
+	left := Point{p.x - 1, p.y}
+	if validMove(p, left, grid) {
+		retval = append(retval, left)
+	}
+	// point right
+	right := Point{p.x + 1, p.y}
+	if validMove(p, right, grid) {
+		retval = append(retval, right)
+	}
+
+	return retval
+}
+
+func printMap(grid [][]int) {
+	for _, line := range grid {
+		for _, v := range line {
+			fmt.Printf("%c", from_level(v))
+		}
+		fmt.Println()
+	}
+}
+
+func printDistances(grid [][]int, distances [][]int) {
+	for y, line := range distances {
+		for x, v := range line {
+			fmt.Printf("%5d/%c", v, from_level(grid[y][x]))
+		}
+		fmt.Println()
+	}
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	grid := [][]int{}
+	distances := [][]int{}
+	var start Point
+	var end Point
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		row := []int{}
+		drow := []int{}
+
+		y := len(grid)
+		for x, r := range []rune(line) {
+			if r == 'S' {
+				r = 'a'
+				start = Point{x, y}
+			}
+			if r == 'E' {
+				r = 'z'
+				end = Point{x, y}
+			}
+			row = append(row, to_level(r))
+			drow = append(drow, -1)
+		}
+		grid = append(grid, row)
+		distances = append(distances, drow)
+	}
+
+	file.Close()
+
+	distances[end.y][end.x] = 0
+
+	printMap(grid)
+	printDistances(grid, distances)
+	fmt.Printf("Start position is (%d, %d)\n", start.x, start.y)
+	fmt.Printf("End position is (%d, %d)\n", end.x, end.y)
+	fmt.Println("Valid first steps:", nextSteps(start, grid))
+	iteration := 0
+	keepGoing := true
+	for keepGoing {
+		fmt.Println("Running iteration", iteration)
+		printDistances(grid, distances)
+		keepGoing = updateDistances(grid, distances)
+		iteration += 1
+	}
+	fmt.Printf("Best path is %d steps long.\n", distances[start.y][start.x])
+
+	closestAIs := -1
+	for y, line := range grid {
+		for x, v := range line {
+			if from_level(v) == 'a' {
+				distance := distances[y][x]
+				fmt.Printf("Point (%d, %d) is level `a`, and is %d steps from end.\n", x, y, distance)
+				if distance != -1 {
+					if closestAIs == -1 || distance < closestAIs {
+						closestAIs = distance
+					}
+				}
+			}
+		}
+	}
+	fmt.Println("The closest 'a' is", closestAIs, "steps away.")
+}
diff --git a/solutions/day13/day13.go b/solutions/day13/day13.go
new file mode 100644
index 0000000..bae0d20
--- /dev/null
+++ b/solutions/day13/day13.go
@@ -0,0 +1,208 @@
+package day13
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+)
+
+type Element struct {
+	isNumber bool
+	number   int
+	sublist  []Element
+}
+
+func parseElement(line string) (retval Element, remainder string, err error) {
+	line = strings.TrimSpace(line)
+	//fmt.Printf("Working on line: '%s'\n", line)
+	if line[0] == '[' {
+		sublist := []Element{}
+
+		if line[1] == ']' {
+			retval = Element{false, 0, sublist}
+			remainder = line[2:]
+			return
+		}
+
+		work := line[1:]
+		for {
+			element, rest, suberr := parseElement(work)
+			//fmt.Println("Back from subcall with element", element, "rest", rest, "suberr", suberr)
+			if suberr != nil {
+				err = fmt.Errorf("suberror: %s", suberr)
+				return
+			}
+			sublist = append(sublist, element)
+			if rest[0] == ',' {
+				work = rest[1:]
+			} else if rest[0] == ']' {
+				work = rest[1:]
+				break
+			} else {
+				err = fmt.Errorf("don't know how to deal with list that ends with '%s'", rest)
+				return
+			}
+		}
+
+		retval = Element{false, 0, sublist}
+		remainder = work
+		return
+	} else if line[0] >= '0' && line[0] <= '9' {
+		var computed int
+
+		for computed = 0; line[0] >= '0' && line[0] <= '9'; line = line[1:] {
+			computed = (computed * 10) + int(line[0]-'0')
+		}
+
+		retval = Element{true, computed, nil}
+		remainder = line
+		return
+	} else {
+		err = fmt.Errorf("panic: Don't know how to parse line element '%s'", line)
+		return
+	}
+}
+
+func renderElement(element Element) string {
+	if element.isNumber {
+		return fmt.Sprintf("%d", element.number)
+	} else {
+		retval := "["
+
+		if len(element.sublist) > 0 {
+			retval += renderElement(element.sublist[0])
+		}
+
+		for i := 1; i < len(element.sublist); i++ {
+			retval += fmt.Sprintf(",%s", renderElement(element.sublist[i]))
+		}
+
+		retval += "]"
+		return retval
+	}
+}
+
+type OrderResult int
+
+const (
+	ProperlyOrdered OrderResult = iota
+	ImproperlyOrdered
+	Unknown
+)
+
+func compareElements(a Element, b Element) OrderResult {
+	if a.isNumber && b.isNumber {
+		return compareNumbers(a.number, b.number)
+	} else if a.isNumber && !b.isNumber {
+		return compareLists([]Element{{true, a.number, nil}}, b.sublist)
+	} else if !a.isNumber && b.isNumber {
+		return compareLists(a.sublist, []Element{{true, b.number, nil}})
+	} else {
+		return compareLists(a.sublist, b.sublist)
+	}
+}
+
+func compareNumbers(a int, b int) OrderResult {
+	if a < b {
+		return ProperlyOrdered
+	}
+
+	if a > b {
+		return ImproperlyOrdered
+	}
+
+	return Unknown
+}
+
+func compareLists(a []Element, b []Element) OrderResult {
+	if len(a) > 0 && len(b) > 0 {
+		headResult := compareElements(a[0], b[0])
+
+		if headResult != Unknown {
+			return headResult
+		}
+
+		return compareLists(a[1:], b[1:])
+	}
+
+	if len(a) == 0 && len(b) == 0 {
+		return Unknown
+	}
+
+	if len(a) == 0 {
+		return ProperlyOrdered
+	}
+
+	return ImproperlyOrdered
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	elements := []Element{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if len(line) == 0 {
+			continue
+		}
+		element, remainder, err := parseElement(line)
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+		if len(remainder) > 0 {
+			fmt.Printf("Unexpected remainder in line: '%s'\n", remainder)
+			return
+		}
+		fmt.Println("Parsed element", renderElement(element))
+		elements = append(elements, element)
+	}
+
+	total := 0
+	for i := 0; i < len(elements); i += 2 {
+		index := i/2 + 1
+		switch compareElements(elements[i], elements[i+1]) {
+		case ProperlyOrdered:
+			fmt.Printf("Pair #%d is properly ordered\n", index)
+			total += index
+		case ImproperlyOrdered:
+			fmt.Printf("Pair #%d is NOT properly ordered\n", index)
+		case Unknown:
+			fmt.Printf("Pair #%d is UNKNOWN\n", index)
+		default:
+			fmt.Printf("PANIC PANIC PANIC: Unknown ordering?!\n")
+		}
+	}
+	fmt.Println("\nTotal proper index value is", total)
+
+	divider2, _, _ := parseElement("[[2]]")
+	divider6, _, _ := parseElement("[[6]]")
+	elements = append(elements, divider2, divider6)
+
+	sort.SliceStable(elements, func(i, j int) bool {
+		return compareElements(elements[i], elements[j]) == ProperlyOrdered
+	})
+
+	fmt.Println()
+	fmt.Println("Sorted order:")
+	decoderKey := 1
+	for i := 0; i < len(elements); i++ {
+		fmt.Println(renderElement(elements[i]))
+		if compareElements(elements[i], divider2) == Unknown || compareElements(elements[i], divider6) == Unknown {
+			decoderKey *= i + 1
+		}
+	}
+	fmt.Println("Decoder key is", decoderKey)
+
+	file.Close()
+}
diff --git a/solutions/day14/day14.go b/solutions/day14/day14.go
new file mode 100644
index 0000000..f033111
--- /dev/null
+++ b/solutions/day14/day14.go
@@ -0,0 +1,295 @@
+package day14
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Point struct {
+	x int
+	y int
+}
+
+func parsePoint(v string) (result Point, err error) {
+	var parts []string = strings.Split(v, ",")
+	if len(parts) != 2 {
+		err = errors.New("Weird number of parts in point")
+		return
+	}
+
+	x, xerr := strconv.Atoi(parts[0])
+	if xerr != nil {
+		err = xerr
+		return
+	}
+
+	y, yerr := strconv.Atoi(parts[1])
+	if yerr != nil {
+		err = yerr
+		return
+	}
+
+	result = Point{x, y}
+	return
+}
+
+type Segment struct {
+	start Point
+	end   Point
+}
+
+func parseSegments(line string) (result []Segment, err error) {
+	parts := strings.Split(line, " -> ")
+	result = []Segment{}
+	var left *Point = nil
+
+	for _, rightString := range parts {
+		right, rerr := parsePoint(rightString)
+		if rerr != nil {
+			err = rerr
+			return
+		}
+		if left != nil {
+			result = append(result, Segment{*left, right})
+		}
+		left = &right
+	}
+
+	return
+}
+
+func segmentPoints(segments []Segment) []Point {
+	retval := []Point{}
+
+	for _, segment := range segments {
+		retval = append(retval, segment.start, segment.end)
+	}
+
+	return retval
+}
+
+func findExtents(segments []Segment) (leftmost int, rightmost int, bottom int) {
+	leftmost = int(^uint(0) >> 1)
+	rightmost = 0
+	bottom = 0
+
+	for _, point := range segmentPoints(segments) {
+		if point.x < leftmost {
+			leftmost = point.x
+		}
+		if point.x > rightmost {
+			rightmost = point.x
+		}
+		if point.y > bottom {
+			bottom = point.y
+		}
+	}
+
+	return
+}
+
+type Cell int
+
+const (
+	Air Cell = iota
+	Stone
+	Sand
+	Start
+)
+
+func drawGraph(graph [][]Cell) {
+	for _, line := range graph {
+		for _, v := range line {
+			switch v {
+			case Air:
+				fmt.Printf(".")
+			case Stone:
+				fmt.Printf("#")
+			case Sand:
+				fmt.Printf("O")
+			case Start:
+				fmt.Printf("+")
+			default:
+				fmt.Printf("?")
+			}
+		}
+		fmt.Println()
+	}
+	fmt.Println()
+}
+
+type State int
+
+const (
+	Good State = iota
+	Stop
+	Done
+)
+
+func nextStep(curX int, curY int, graph [][]Cell) (nextX int, nextY int, state State) {
+	if curY+1 >= len(graph) {
+		state = Done
+		return
+	}
+
+	if graph[curY+1][curX] == Air {
+		nextX = curX
+		nextY = curY + 1
+		state = Good
+		return
+	}
+
+	if curX == 0 {
+		state = Done
+		return
+	}
+
+	if graph[curY+1][curX-1] == Air {
+		nextX = curX - 1
+		nextY = curY + 1
+		state = Good
+		return
+	}
+
+	if curX+1 >= len(graph[0]) {
+		state = Done
+		return
+	}
+
+	if graph[curY+1][curX+1] == Air {
+		nextX = curX + 1
+		nextY = curY + 1
+		state = Good
+		return
+	}
+
+	state = Stop
+	return
+}
+
+func dropGrain(startX int, graph [][]Cell) bool {
+	curX := startX
+	curY := 0
+
+	for true {
+		nextX, nextY, result := nextStep(curX, curY, graph)
+		switch result {
+		case Done:
+			return true
+		case Stop:
+			result := graph[curY][curX] == Start
+			graph[curY][curX] = Sand
+			return result
+		case Good:
+			curX = nextX
+			curY = nextY
+		}
+	}
+
+	return true
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	segments := []Segment{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		newSegments, err := parseSegments(line)
+
+		if err != nil {
+			fmt.Println("PANIC", err)
+			return
+		}
+
+		for _, segment := range newSegments {
+			segments = append(segments, segment)
+		}
+	}
+
+	file.Close()
+
+	fmt.Println(segments)
+	leftmostX, rightmostX, bottomY := findExtents(segments)
+	fmt.Println("Leftmost X value is", leftmostX)
+	fmt.Println("Rightmost X value is", rightmostX)
+	fmt.Println("Bottom Y value is", bottomY)
+	leftmostX = 0
+	rightmostX += 500
+	width := rightmostX - leftmostX
+	graph := [][]Cell{}
+	for y := 0; y <= bottomY+2; y++ {
+		line := []Cell{}
+
+		for x := 0; x <= width; x++ {
+			line = append(line, Air)
+		}
+		graph = append(graph, line)
+	}
+	segments = append(segments, Segment{Point{leftmostX, bottomY + 2}, Point{rightmostX, bottomY + 2}})
+	for _, segment := range segments {
+		if segment.start.x == segment.end.x {
+			var top int
+			var bottom int
+
+			if segment.start.y < segment.end.y {
+				top = segment.start.y
+				bottom = segment.end.y
+			} else {
+				top = segment.end.y
+				bottom = segment.start.y
+			}
+
+			for current := top; current <= bottom; current++ {
+				graph[current][segment.start.x-leftmostX] = Stone
+			}
+
+			continue
+		}
+
+		if segment.start.y == segment.end.y {
+			var left int
+			var right int
+
+			if segment.start.x < segment.end.x {
+				left = segment.start.x
+				right = segment.end.x
+			} else {
+				left = segment.end.x
+				right = segment.start.x
+			}
+
+			for current := left; current <= right; current++ {
+				graph[segment.start.y][current-leftmostX] = Stone
+			}
+
+			continue
+		}
+
+		fmt.Println("PANIC: Diagonal line!?")
+		return
+	}
+	graph[0][500-leftmostX] = Start
+	drawGraph(graph)
+	count := 0
+	for !dropGrain(500-leftmostX, graph) {
+		count += 1
+	}
+	drawGraph(graph)
+	fmt.Println("Dropped", count, "grains of sand")
+	if graph[0][500-leftmostX] != Sand {
+		fmt.Println("PANIC: NOT WIDE ENOUGH")
+	}
+}
diff --git a/solutions/day15/day15.go b/solutions/day15/day15.go
new file mode 100644
index 0000000..4eb2090
--- /dev/null
+++ b/solutions/day15/day15.go
@@ -0,0 +1,182 @@
+package day15
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+type Point struct {
+	x int
+	y int
+}
+
+func pointDistance(a Point, b Point) int {
+	return diff(a.x, b.x) + diff(a.y, b.y)
+}
+
+func diff(a int, b int) int {
+	if a > b {
+		return a - b
+	} else {
+		return b - a
+	}
+}
+
+type Sensor struct {
+	location Point
+	distance int
+}
+
+func parseLine(line string) (sensor Sensor, beacon Point) {
+	var sensorX int
+	var sensorY int
+	var beaconX int
+	var beaconY int
+
+	fmt.Sscanf(line, "Sensor at x=%d, y=%d: closest beacon is at x=%d, y=%d", &sensorX, &sensorY, &beaconX, &beaconY)
+	sensorLoc := Point{sensorX, sensorY}
+	beacon = Point{beaconX, beaconY}
+	distance := pointDistance(sensorLoc, beacon)
+	sensor = Sensor{sensorLoc, distance}
+	return
+}
+
+func isBeacon(x int, y int, beacons []Point) bool {
+	for _, beacon := range beacons {
+		if beacon.x == x && beacon.y == y {
+			return true
+		}
+	}
+	return false
+}
+
+func inSensorRange(x int, y int, sensors []Sensor) *Sensor {
+	point := Point{x, y}
+	for _, sensor := range sensors {
+		distance := pointDistance(point, sensor.location)
+		if distance <= sensor.distance {
+			return &sensor
+		}
+	}
+	return nil
+}
+
+func leftmostPoint(sensors []Sensor) int {
+	leftmost := 0
+
+	for _, sensor := range sensors {
+		candidate := sensor.location.x - sensor.distance
+		if candidate < leftmost {
+			leftmost = candidate
+		}
+	}
+
+	return leftmost
+}
+
+func rightmostPoint(sensors []Sensor) int {
+	rightmost := 0
+
+	for _, sensor := range sensors {
+		candidate := sensor.location.x + sensor.distance
+		if candidate > rightmost {
+			rightmost = candidate
+		}
+	}
+
+	return rightmost
+}
+
+func addLinePoints(pointSet *[]Point, start Point, end Point) {
+	offsetX := 1
+	offsetY := 1
+
+	if end.x < start.x {
+		offsetX = -1
+	}
+	if end.y < start.y {
+		offsetY = -1
+	}
+
+	for x, y := start.x, start.y; y != end.y; x, y = x+offsetX, y+offsetY {
+		*pointSet = append(*pointSet, Point{x, y})
+	}
+}
+
+func addEdgePoints(pointSet *[]Point, sensor Sensor) {
+	distance := sensor.distance + 1
+	top := Point{sensor.location.x, sensor.location.y - distance}
+	right := Point{sensor.location.x + distance, sensor.location.y}
+	bottom := Point{sensor.location.x, sensor.location.y + distance}
+	left := Point{sensor.location.x - distance, sensor.location.y}
+
+	addLinePoints(pointSet, top, right)
+	addLinePoints(pointSet, right, bottom)
+	addLinePoints(pointSet, bottom, left)
+	addLinePoints(pointSet, left, top)
+}
+
+func Run(filename string, yStr string, maxCoordStr string) {
+	y, err := strconv.Atoi(yStr)
+	if err != nil {
+		fmt.Println("PANIC: bad y argument", yStr)
+		return
+	}
+
+	maxCoord, err := strconv.Atoi(maxCoordStr)
+	if err != nil {
+		fmt.Println("PANIC: bad y argument", maxCoordStr)
+		return
+	}
+
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	sensors := []Sensor{}
+	beacons := []Point{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		sensor, beacon := parseLine(line)
+		sensors = append(sensors, sensor)
+		beacons = append(beacons, beacon)
+	}
+
+	file.Close()
+
+	fmt.Println(sensors)
+
+	count := 0
+	for x := leftmostPoint(sensors); x <= rightmostPoint(sensors); x++ {
+		if isBeacon(x, y, beacons) {
+			continue
+		}
+
+		if inSensorRange(x, y, sensors) != nil {
+			count += 1
+		}
+	}
+	fmt.Println("Beacons couldn't be in", count, "places on line", y)
+
+	candidates := []Point{}
+	for _, sensor := range sensors {
+		addEdgePoints(&candidates, sensor)
+	}
+
+	for _, candidate := range candidates {
+		if candidate.x >= 0 && candidate.y >= 0 && candidate.x <= maxCoord && candidate.y <= maxCoord {
+			closestSensor := inSensorRange(candidate.x, candidate.y, sensors)
+			if closestSensor == nil {
+				fmt.Printf("Found possible beacon location at (%d, %d). Frequency value is %d\n", candidate.x, candidate.y, candidate.x*4000000+candidate.y)
+			}
+		}
+	}
+}
diff --git a/solutions/day16/day16.go b/solutions/day16/day16.go
new file mode 100644
index 0000000..b87ae12
--- /dev/null
+++ b/solutions/day16/day16.go
@@ -0,0 +1,185 @@
+package day16
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+	"unicode"
+)
+
+type Valve struct {
+	flowRate int
+	leadsTo  []string
+}
+
+type SimulationPoint struct {
+	time       int
+	imAt       string
+	elephantAt string
+	opened     string
+}
+
+type MovePair struct {
+	me       string
+	elephant string
+}
+
+func newMovePair(useElephant bool, a string, b string) MovePair {
+	if useElephant && a != "**" && b != "**" && b < a {
+		return MovePair{b, a}
+	} else {
+		return MovePair{a, b}
+	}
+}
+
+func addMovePair(pair MovePair, list *[]MovePair) {
+	for _, existing := range *list {
+		if existing.me == pair.me && existing.elephant == pair.elephant {
+			return
+		}
+	}
+	*list = append(*list, pair)
+}
+
+func alreadyVisited(place string, point SimulationPoint) bool {
+	for i := 0; i < len(point.opened); i += 2 {
+		if place[0] == point.opened[i] && place[1] == point.opened[i+1] {
+			return true
+		}
+	}
+	return false
+}
+
+func addPlace(place string, opened string) string {
+	injectionPoint := 0
+
+	for injectionPoint < len(opened) && (opened[injectionPoint] < place[0] || (opened[injectionPoint] == place[0] && opened[injectionPoint+1] < place[1])) {
+		injectionPoint += 2
+	}
+
+	return opened[0:injectionPoint] + place + opened[injectionPoint:]
+}
+
+var everythingOpened string
+var simulatedItems map[SimulationPoint]int
+
+func runSimulations(useElephant bool, time int, myPlace string, elephantAt string, opened string, valves map[string]Valve) int {
+	maxTime := 30
+	if useElephant {
+		maxTime = 26
+	}
+
+	if time == maxTime || everythingOpened == opened {
+		return 0
+	}
+
+	point := SimulationPoint{time, myPlace, elephantAt, opened}
+
+	if previousValue, ok := simulatedItems[point]; ok {
+		return previousValue
+	}
+
+	bestResult := 0
+
+	myMoves := []string{}
+	if !alreadyVisited(myPlace, point) && valves[myPlace].flowRate != 0 {
+		myMoves = append(myMoves, "**")
+	}
+	myMoves = append(myMoves, valves[myPlace].leadsTo...)
+
+	elephantMoves := []string{"AA"}
+	if useElephant {
+		elephantMoves = []string{}
+		if !alreadyVisited(elephantAt, point) && valves[elephantAt].flowRate != 0 && myPlace != elephantAt {
+			elephantMoves = append(elephantMoves, "**")
+		}
+		elephantMoves = append(elephantMoves, valves[elephantAt].leadsTo...)
+	}
+
+	moves := []MovePair{}
+	for _, myMove := range myMoves {
+		for _, elephantMove := range elephantMoves {
+			pair := newMovePair(useElephant, myMove, elephantMove)
+			addMovePair(pair, &moves)
+		}
+	}
+
+	for _, pair := range moves {
+		myMove := pair.me
+		elephantMove := pair.elephant
+		openReleases := 0
+		myNext := myPlace
+		elephantNext := elephantAt
+		nowOpen := opened
+
+		if myMove == "**" {
+			openReleases += valves[myPlace].flowRate * (maxTime - (time + 1))
+			nowOpen = addPlace(myPlace, nowOpen)
+		} else {
+			myNext = myMove
+		}
+
+		if elephantMove == "**" {
+			openReleases += valves[elephantAt].flowRate * (maxTime - (time + 1))
+			nowOpen = addPlace(elephantAt, nowOpen)
+		} else {
+			elephantNext = elephantMove
+		}
+
+		candidate := openReleases + runSimulations(useElephant, time+1, myNext, elephantNext, nowOpen, valves)
+		if candidate > bestResult {
+			bestResult = candidate
+		}
+	}
+
+	simulatedItems[point] = bestResult
+
+	return bestResult
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	valveMap := map[string]Valve{}
+	everythingOpened = ""
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		var valve string
+		var rate int
+		fmt.Sscanf(line, "Valve %s has flow rate=%d", &valve, &rate)
+		_, after_semi, found_semi := strings.Cut(line, ";")
+		if !found_semi {
+			fmt.Println("PANIC: Couldn't find semi colon in line.")
+			return
+		}
+		after_semi = strings.TrimLeftFunc(after_semi, func(r rune) bool {
+			return !unicode.IsUpper(r)
+		})
+		targets := strings.Split(after_semi, ", ")
+
+		if rate > 0 {
+			everythingOpened = addPlace(valve, everythingOpened)
+		}
+
+		valveMap[valve] = Valve{rate, targets}
+	}
+
+	simulatedItems = map[SimulationPoint]int{}
+	bestRelease1 := runSimulations(false, 0, "AA", "AA", "", valveMap)
+	fmt.Println("Working on my own, best pressure release found is", bestRelease1)
+
+	simulatedItems = map[SimulationPoint]int{}
+	bestRelease2 := runSimulations(true, 0, "AA", "AA", "", valveMap)
+	fmt.Println("Working with an elephant, best pressure release found is", bestRelease2)
+
+	file.Close()
+}
diff --git a/solutions/day17/day17.go b/solutions/day17/day17.go
new file mode 100644
index 0000000..272bb87
--- /dev/null
+++ b/solutions/day17/day17.go
@@ -0,0 +1,301 @@
+package day17
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type Piece []string
+
+var horizontalBar Piece = Piece{"@@@@"}
+var plus Piece = Piece{".@.", "@@@", ".@."}
+var backwardsL Piece = Piece{"..@", "..@", "@@@"}
+var verticalBar Piece = Piece{"@", "@", "@", "@"}
+var block Piece = Piece{"@@", "@@"}
+
+var pieces []Piece = []Piece{horizontalBar, plus, backwardsL, verticalBar, block}
+
+type Board [][]rune
+
+func newBoard() Board {
+	return Board{}
+}
+
+func pieceToRows(piece Piece) Board {
+	retval := Board{}
+
+	for i := range piece {
+		newRow := append([]rune(".."), []rune(piece[i])...)
+
+		for len(newRow) < 7 {
+			newRow = append(newRow, '.')
+		}
+
+		retval = append(retval, newRow)
+	}
+
+	return retval
+}
+
+func rowEmpty(row int, board Board) bool {
+	if row >= len(board) {
+		return false
+	}
+
+	for i := 0; i < 7; i++ {
+		if board[row][i] != '.' {
+			return false
+		}
+	}
+
+	return true
+}
+
+func addPiece(piece Piece, board *Board) {
+	rows := pieceToRows(piece)
+	for !(rowEmpty(0, *board) && rowEmpty(1, *board) && rowEmpty(2, *board)) {
+		*board = append(Board{[]rune(".......")}, *board...)
+	}
+	for len(*board) >= 3 && rowEmpty(3, *board) {
+		*board = (*board)[1:]
+	}
+	*board = append(rows, *board...)
+}
+
+func printBoard(board *Board) {
+	for _, row := range *board {
+		fmt.Printf("|")
+		for _, r := range row {
+			fmt.Printf("%c", r)
+		}
+		fmt.Printf("|\n")
+	}
+	fmt.Printf("+-------+\n")
+}
+
+func copyBoard(clearPiece bool, currentBoard *Board, newBoard *Board) {
+	for len(*newBoard) < len(*currentBoard) {
+		*newBoard = append(Board{[]rune(".......")}, *newBoard...)
+	}
+	for len(*newBoard) > len(*currentBoard) {
+		*newBoard = (*newBoard)[1:]
+	}
+	for y, row := range *currentBoard {
+		for x, value := range row {
+			if clearPiece && value == '@' {
+				(*newBoard)[y][x] = '.'
+			} else {
+				(*newBoard)[y][x] = (*currentBoard)[y][x]
+			}
+		}
+	}
+}
+
+func movePiece(direction rune, currentBoard *Board, newBoard *Board) bool {
+	/// match the values
+	copyBoard(true, currentBoard, newBoard)
+	for y, row := range *currentBoard {
+		for x, value := range row {
+			if value == '@' {
+				newX := x
+				newY := y
+
+				switch direction {
+				case '<':
+					newX = x - 1
+				case '>':
+					newX = x + 1
+				case 'v':
+					newY = y + 1
+				default:
+					fmt.Printf("PANIC: Invalid direction %c\n", direction)
+					return false
+				}
+
+				if newX < 0 || newX >= 7 || newY >= len(*currentBoard) {
+					return false
+				}
+
+				if (*currentBoard)[newY][newX] == '#' {
+					return false
+				}
+
+				(*newBoard)[newY][newX] = '@'
+			}
+		}
+	}
+
+	return true
+}
+
+func freezeBoard(board *Board) int {
+	for _, row := range *board {
+		for x, value := range row {
+			if value == '@' {
+				row[x] = '#'
+			}
+		}
+	}
+
+	for y := 0; y < len(*board)-3; y++ {
+		allCovered := true
+		for x := 0; x < 7; x++ {
+			allCovered = allCovered && ((*board)[y][x] == '#' || (*board)[y+1][x] == '#' || (*board)[y+2][x] == '#' || (*board)[y+3][x] == '#')
+		}
+
+		if allCovered {
+			originalLength := len(*board)
+			//fmt.Println("--- original board ---")
+			//printBoard(board)
+			*board = (*board)[0 : y+4]
+			//fmt.Println("--- cleaned board ---")
+			//printBoard(board)
+			//fmt.Println("---", originalLength-len(*board), "rows removed ---")
+			removedRows := originalLength - len(*board)
+			//if removedRows > 0 {
+			//	fmt.Println("Removed", removedRows, "rows.")
+			//}
+			return removedRows
+		}
+	}
+
+	return 0
+}
+
+func sameBoard(board1 Board, board2 Board) bool {
+	if len(board1) != len(board2) {
+		return false
+	}
+
+	for y, row := range board1 {
+		for x := range row {
+			if board1[y][x] != board2[y][x] {
+				return false
+			}
+		}
+	}
+
+	return true
+}
+
+func duplicateBoard(board Board) Board {
+	newBoard := Board{}
+
+	for _, row := range board {
+		newRow := []rune(".......")
+		copy(newRow, row)
+		newBoard = append(newBoard, newRow)
+	}
+
+	return newBoard
+}
+
+type PreviousState struct {
+	moveIndex  int
+	pieceIndex int
+}
+
+type PreviousLocation struct {
+	dropNo      int
+	removedRows int
+	board       Board
+}
+
+func Run(filename string, targetStr string) {
+	targetPieces, err := strconv.Atoi(targetStr)
+	if err != nil {
+		fmt.Println("PANIC: Don't understand target number")
+		return
+	}
+
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	instructions := []rune{}
+	for scanner.Scan() {
+		line := scanner.Text()
+		line = strings.TrimFunc(line, func(r rune) bool {
+			return r != '>' && r != '<'
+		})
+		instructions = append(instructions, []rune(line)...)
+	}
+	file.Close()
+
+	board1 := newBoard()
+	board2 := newBoard()
+
+	moveIndex := 0
+	pieceIndex := 0
+	previousStates := map[PreviousState][]PreviousLocation{}
+	removedRows := 0
+	skippedAhead := false
+
+	for dropNo := 1; dropNo <= targetPieces; dropNo++ {
+		//fmt.Println("Dropping piece", dropNo, "with piece", pieceIndex, "and move", moveIndex)
+
+		if !skippedAhead {
+			state := PreviousState{moveIndex, pieceIndex}
+			previousLocations, previousStateExisted := previousStates[state]
+			if previousStateExisted {
+				for _, location := range previousLocations {
+					if sameBoard(board1, location.board) {
+						dropDifference := dropNo - location.dropNo
+						removedRowsDifference := removedRows - location.removedRows
+						fmt.Println("Got it, current drop", dropNo, "previous version", location.dropNo, "removed row diff", removedRowsDifference)
+						repeats := (targetPieces - dropNo) / dropDifference
+						fmt.Println("Drop difference of", dropDifference, "meaning we can do this gap", repeats, "more times")
+						fmt.Println("removed rows", removedRows, "+", repeats*removedRowsDifference, "=", removedRows+(repeats*removedRowsDifference))
+						removedRows += repeats * removedRowsDifference
+						fmt.Println("Drop number", dropNo, "+", repeats*dropDifference, "=", dropNo+(repeats*dropDifference))
+						dropNo += repeats*dropDifference - 1
+						skippedAhead = true
+						break
+					}
+				}
+
+				if skippedAhead {
+					continue
+				} else {
+					previousStates[state] = append(previousStates[state], PreviousLocation{dropNo, removedRows, duplicateBoard(board1)})
+				}
+			} else {
+				previousStates[state] = []PreviousLocation{{dropNo, removedRows, duplicateBoard(board1)}}
+			}
+		}
+
+		addPiece(pieces[pieceIndex], &board1)
+		for {
+			//fmt.Println("Move", moveIndex, "is", string(instructions[moveIndex]))
+			if !movePiece(instructions[moveIndex], &board1, &board2) {
+				copyBoard(false, &board1, &board2)
+			}
+			moveIndex = (moveIndex + 1) % len(instructions)
+			if !movePiece('v', &board2, &board1) {
+				copyBoard(false, &board2, &board1)
+				break
+			}
+		}
+
+		removedRows += freezeBoard(&board1)
+		pieceIndex = (pieceIndex + 1) % len(pieces)
+	}
+
+	//printBoard(&board1)
+	fmt.Println("Removed", removedRows, "rows.")
+	rowsWithRocks := removedRows
+	for i := 0; i < len(board1); i++ {
+		if !rowEmpty(i, board1) {
+			rowsWithRocks += 1
+		}
+	}
+	fmt.Println("Rocks are", rowsWithRocks, "rows tall.")
+}
diff --git a/solutions/day18/day18.go b/solutions/day18/day18.go
new file mode 100644
index 0000000..5cee1c8
--- /dev/null
+++ b/solutions/day18/day18.go
@@ -0,0 +1,148 @@
+package day18
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+type Point struct {
+	x int
+	y int
+	z int
+}
+
+const (
+	Lava int = iota
+	Air
+	Steam
+)
+
+func surroundingPoints(point Point) []Point {
+	return []Point{
+		{point.x - 1, point.y, point.z},
+		{point.x + 1, point.y, point.z},
+		{point.x, point.y - 1, point.z},
+		{point.x, point.y + 1, point.z},
+		{point.x, point.y, point.z - 1},
+		{point.x, point.y, point.z + 1},
+	}
+}
+
+func countBlankSides(points map[Point]int, against int) int {
+	blankSides := 0
+	for point, original := range points {
+		if original == Lava {
+			pointBlankSides := 0
+			for _, surrounding := range surroundingPoints(point) {
+				if points[surrounding] == against {
+					pointBlankSides += 1
+				}
+			}
+			//fmt.Println("Point", point, "had", pointBlankSides, "blank sides.")
+			blankSides += pointBlankSides
+		}
+	}
+	return blankSides
+}
+
+func inUniverse(point Point, min Point, max Point) bool {
+	return point.x >= min.x && point.x <= max.x &&
+		point.y >= min.y && point.y <= max.y &&
+		point.z >= min.z && point.z <= max.x
+}
+
+func floodSteam(minPoint Point, maxPoint Point, points map[Point]int) {
+	stack := []Point{minPoint}
+
+	for len(stack) > 0 {
+		nextIdx := len(stack) - 1
+		next := stack[nextIdx]
+		stack = stack[0:nextIdx]
+
+		if inUniverse(next, minPoint, maxPoint) && points[next] == Air {
+			points[next] = Steam
+			stack = append(stack, surroundingPoints(next)...)
+		}
+	}
+}
+
+func findExtendedBoundingBox(points map[Point]int) (minPoint Point, maxPoint Point) {
+	minPoint = Point{1000000, 100000, 100000}
+	maxPoint = Point{0, 0, 0}
+
+	for point := range points {
+		if point.x < minPoint.x {
+			minPoint.x = point.x
+		}
+		if point.x > maxPoint.x {
+			maxPoint.x = point.x
+		}
+		if point.y < minPoint.y {
+			minPoint.y = point.y
+		}
+		if point.y > maxPoint.y {
+			maxPoint.y = point.y
+		}
+		if point.z < minPoint.z {
+			minPoint.z = point.z
+		}
+		if point.z > maxPoint.z {
+			maxPoint.z = point.z
+		}
+	}
+
+	fmt.Println("Min point", minPoint)
+	fmt.Println("Max point", maxPoint)
+
+	minPoint.x -= 1
+	minPoint.y -= 1
+	minPoint.z -= 1
+	maxPoint.x += 1
+	maxPoint.y += 1
+	maxPoint.z += 1
+
+	return
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	points := map[Point]int{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		var x int
+		var y int
+		var z int
+		fmt.Sscanf(line, "%d,%d,%d", &x, &y, &z)
+		point := Point{x, y, z}
+		points[point] = Lava
+	}
+	file.Close()
+
+	minPoint, maxPoint := findExtendedBoundingBox(points)
+
+	for x := minPoint.x; x <= maxPoint.x; x++ {
+		for y := minPoint.y; y <= maxPoint.y; y++ {
+			for z := minPoint.z; z <= maxPoint.z; z++ {
+				point := Point{x, y, z}
+				_, exists := points[point]
+				if !exists {
+					points[point] = Air
+				}
+			}
+		}
+	}
+
+	fmt.Println("Found", countBlankSides(points, Air), "blank sides in base solid.")
+	floodSteam(minPoint, maxPoint, points)
+	fmt.Println("Found", countBlankSides(points, Steam), "blank sides after filling interior.")
+
+}
diff --git a/solutions/day19/day19.go b/solutions/day19/day19.go
new file mode 100644
index 0000000..4efc181
--- /dev/null
+++ b/solutions/day19/day19.go
@@ -0,0 +1,171 @@
+package day19
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+type Blueprint struct {
+	blueprintNumber   int
+	oreRobotOreCost   int
+	clayRobotOreCost  int
+	obsRobotOreCost   int
+	obsRobotClayCost  int
+	geodeRobotOreCost int
+	geodeRobotObsCost int
+}
+
+type State struct {
+	minute   int
+	ore      int
+	clay     int
+	obsidian int
+	geodes   int
+
+	oreRobots      int
+	clayRobots     int
+	obsidianRobots int
+	geodeRobots    int
+}
+
+var initialState State = State{0, 0, 0, 0, 0, 1, 0, 0, 0}
+
+func copyState(state State) State {
+	return State{
+		state.minute,
+		state.ore,
+		state.clay,
+		state.obsidian,
+		state.geodes,
+		state.oreRobots,
+		state.clayRobots,
+		state.obsidianRobots,
+		state.geodeRobots,
+	}
+}
+
+func nextStates(current State, minutes int, blueprint Blueprint) []State {
+	if current.minute == minutes {
+		return []State{}
+	}
+
+	buyNothing := State{
+		current.minute + 1,
+		current.ore + current.oreRobots,
+		current.clay + current.clayRobots,
+		current.obsidian + current.obsidianRobots,
+		current.geodes + current.geodeRobots,
+		current.oreRobots,
+		current.clayRobots,
+		current.obsidianRobots,
+		current.geodeRobots,
+	}
+
+	retval := []State{buyNothing}
+
+	if current.ore >= blueprint.oreRobotOreCost {
+		buyOre := copyState(buyNothing)
+		buyOre.ore -= blueprint.oreRobotOreCost
+		buyOre.oreRobots += 1
+		retval = append(retval, buyOre)
+	}
+
+	if current.ore >= blueprint.clayRobotOreCost {
+		buyClay := copyState(buyNothing)
+		buyClay.ore -= blueprint.clayRobotOreCost
+		buyClay.clayRobots += 1
+		retval = append(retval, buyClay)
+	}
+
+	if current.ore >= blueprint.obsRobotOreCost && current.clay >= blueprint.obsRobotClayCost {
+		buyObsidian := copyState(buyNothing)
+		buyObsidian.ore -= blueprint.obsRobotOreCost
+		buyObsidian.clay -= blueprint.obsRobotClayCost
+		buyObsidian.obsidianRobots += 1
+		retval = append(retval, buyObsidian)
+	}
+
+	if current.ore >= blueprint.geodeRobotOreCost && current.obsidian >= blueprint.geodeRobotObsCost {
+		buyGeode := copyState(buyNothing)
+		buyGeode.ore -= blueprint.geodeRobotOreCost
+		buyGeode.obsidian -= blueprint.geodeRobotObsCost
+		buyGeode.geodeRobots += 1
+		retval = append(retval, buyGeode)
+	}
+
+	return retval
+}
+
+func runSimulation(blueprint Blueprint, minutes int) int {
+	visited := map[State]bool{}
+	queue := []State{initialState}
+	bestResult := 0
+
+	for len(queue) > 0 {
+		nextState := queue[len(queue)-1]
+		queue = queue[0 : len(queue)-1]
+
+		_, alreadyDone := visited[nextState]
+		if alreadyDone {
+			continue
+		}
+		visited[nextState] = true
+
+		minutesLeft := minutes - nextState.minute
+		bestPossibleFuture := nextState.geodes + (minutesLeft*(2*nextState.geodeRobots+(minutesLeft-1)))/2
+		if bestPossibleFuture < bestResult {
+			continue
+		}
+
+		newStates := nextStates(nextState, minutes, blueprint)
+		if len(newStates) == 0 {
+			if nextState.geodes > bestResult {
+				bestResult = nextState.geodes
+			}
+		}
+		queue = append(queue, newStates...)
+	}
+
+	return bestResult
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	blueprints := []Blueprint{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		var blueprintNumber, oreRobotOre, clayRobotOre, obsRobotOre, obsRobotClay, geodeRobotOre, geodeRobotObs int
+		fmt.Sscanf(line, "Blueprint %d: Each ore robot costs %d ore. Each clay robot costs %d ore. Each obsidian robot costs %d ore and %d clay. Each geode robot costs %d ore and %d obsidian.", &blueprintNumber, &oreRobotOre, &clayRobotOre, &obsRobotOre, &obsRobotClay, &geodeRobotOre, &geodeRobotObs)
+		blueprints = append(blueprints, Blueprint{blueprintNumber, oreRobotOre, clayRobotOre, obsRobotOre, obsRobotClay, geodeRobotOre, geodeRobotObs})
+	}
+	file.Close()
+
+	fmt.Println("Blueprints", blueprints)
+	totalQualityLevel := 0
+	for _, blueprint := range blueprints {
+		geodesHarvested := runSimulation(blueprint, 24)
+		fmt.Println("Found", geodesHarvested, "geodes for blueprint", blueprint.blueprintNumber)
+		totalQualityLevel += geodesHarvested * blueprint.blueprintNumber
+	}
+	fmt.Println("Total quality level of all blueprints at 24 minutes is", totalQualityLevel)
+
+	multipliedGeodes := 1
+	if len(blueprints) > 3 {
+		blueprints = blueprints[0:3]
+	}
+	for _, blueprint := range blueprints {
+		geodesHarvested := runSimulation(blueprint, 32)
+		fmt.Println("Found", geodesHarvested, "geodes for blueprint", blueprint.blueprintNumber)
+		multipliedGeodes *= geodesHarvested
+	}
+	fmt.Println("Multiplied number of geodes of first three blueprints at 32 minutes is", multipliedGeodes)
+}
diff --git a/solutions/day2/day2.go b/solutions/day2/day2.go
new file mode 100644
index 0000000..efd1586
--- /dev/null
+++ b/solutions/day2/day2.go
@@ -0,0 +1,166 @@
+package day2
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+
+	"golang.org/x/exp/utf8string"
+)
+
+type Move = int
+
+const (
+	Rock     Move = 1
+	Paper         = 2
+	Scissors      = 3
+)
+
+type Result = int
+
+const (
+	Loss Result = 0
+	Tie         = 3
+	Win         = 6
+)
+
+func score(opponent Move, us Move) int {
+	switch opponent {
+	case Rock:
+		switch us {
+		case Rock:
+			return Rock + Tie
+		case Paper:
+			return Paper + Win
+		case Scissors:
+			return Scissors + Loss
+		}
+
+	case Paper:
+		switch us {
+		case Rock:
+			return Rock + Loss
+		case Paper:
+			return Paper + Tie
+		case Scissors:
+			return Scissors + Win
+		}
+
+	case Scissors:
+		switch us {
+		case Rock:
+			return Rock + Win
+		case Paper:
+			return Paper + Loss
+		case Scissors:
+			return Scissors + Tie
+		}
+	}
+
+	fmt.Println("PANIC: Unknown combo: them", opponent, "us", us)
+	return 0
+}
+
+func compute_move(opponent Move, goal Result) Move {
+	switch opponent {
+	case Rock:
+		switch goal {
+		case Loss:
+			return Scissors
+		case Tie:
+			return Rock
+		case Win:
+			return Paper
+		}
+
+	case Paper:
+		switch goal {
+		case Loss:
+			return Rock
+		case Tie:
+			return Paper
+		case Win:
+			return Scissors
+		}
+
+	case Scissors:
+		switch goal {
+		case Loss:
+			return Paper
+		case Tie:
+			return Scissors
+		case Win:
+			return Rock
+		}
+	}
+
+	fmt.Println("PANIC: Unknown combo: them", opponent, "goal", goal)
+	return 0
+
+}
+
+func move(r rune) Move {
+	switch r {
+	case 'A':
+		return Rock
+	case 'B':
+		return Paper
+	case 'C':
+		return Scissors
+	case 'X':
+		return Rock
+	case 'Y':
+		return Paper
+	case 'Z':
+		return Scissors
+	}
+	fmt.Println("PANIC: Unknown character", r)
+	return 0
+}
+
+func result(r rune) Result {
+	switch r {
+	case 'X':
+		return Loss
+	case 'Y':
+		return Tie
+	case 'Z':
+		return Win
+	}
+	fmt.Println("PANIC: Unknown character for result", r)
+	return 99
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	var total_score_base int = 0
+	var total_score_extended int = 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		utf8 := utf8string.NewString(line)
+
+		opponent := move(utf8.At(0))
+		us := move(utf8.At(2))
+
+		total_score_base += score(opponent, us)
+
+		target := result(utf8.At(2))
+		computed_move := compute_move(opponent, target)
+		total_score_extended += score(opponent, computed_move)
+	}
+
+	file.Close()
+
+	fmt.Println("Total initial score is", total_score_base)
+	fmt.Println("Total score with back compute is", total_score_extended)
+}
diff --git a/solutions/day20/day20.go b/solutions/day20/day20.go
new file mode 100644
index 0000000..42a29d7
--- /dev/null
+++ b/solutions/day20/day20.go
@@ -0,0 +1,144 @@
+package day20
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func printNumbers(numbers []int, nexts []int) {
+	current := 0
+
+	for nexts[current] == -1 {
+		current += 1
+	}
+
+	first := numbers[current]
+	fmt.Printf("%d", first)
+	current = nexts[current]
+	for numbers[current] != first {
+		fmt.Printf(" %d", numbers[current])
+		current = nexts[current]
+	}
+	fmt.Println()
+}
+
+func removeIndex(idx int, prevs []int, nexts []int) (before int, after int) {
+	before = prevs[idx]
+	after = nexts[idx]
+
+	nexts[before] = after
+	prevs[after] = before
+	prevs[idx] = -1
+	nexts[idx] = -1
+
+	return
+}
+
+func insertAfter(idx int, after int, prevs []int, nexts []int) {
+	afterNext := nexts[after]
+	prevs[idx] = after
+	nexts[idx] = afterNext
+	prevs[afterNext] = idx
+	nexts[after] = idx
+}
+
+func insertBefore(idx int, before int, prevs []int, nexts []int) {
+	beforePrev := prevs[before]
+	prevs[idx] = beforePrev
+	nexts[idx] = before
+	prevs[before] = idx
+	nexts[beforePrev] = idx
+}
+
+func shift(count int, idx int, prevs []int, nexts []int) {
+	count %= len(prevs) - 1
+	for count != 0 {
+		before, after := removeIndex(idx, prevs, nexts)
+		if count > 0 {
+			insertAfter(idx, after, prevs, nexts)
+			count -= 1
+		} else {
+			insertBefore(idx, before, prevs, nexts)
+			count += 1
+		}
+	}
+}
+
+func indexPast(count int, current int, nexts []int) int {
+	for count > 0 {
+		current = nexts[current]
+		count -= 1
+	}
+	return current
+}
+
+func Run(filename string, keyString string, countString string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	key, err := strconv.Atoi(keyString)
+	if err != nil {
+		fmt.Println("Invalid key value", err)
+		return
+	}
+
+	roundCount, err := strconv.Atoi(countString)
+	if err != nil {
+		fmt.Println("Invalid round count", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	numbers := []int{}
+	nexts := []int{}
+	prevs := []int{}
+	zeroIndex := -1
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		x, err := strconv.Atoi(line)
+		if err != nil {
+			fmt.Println("Couldn't parse number", line)
+			return
+		}
+		numbers = append(numbers, x*key)
+		nexts = append(nexts, 0)
+		prevs = append(prevs, 0)
+
+		if x == 0 {
+			zeroIndex = len(numbers) - 1
+		}
+	}
+
+	for idx := range nexts {
+		nexts[idx] = (idx + 1) % len(nexts)
+		if idx == 0 {
+			prevs[idx] = len(prevs) - 1
+		} else {
+			prevs[idx] = idx - 1
+		}
+	}
+	file.Close()
+
+	for round := 0; round < roundCount; round++ {
+		for idx := range numbers {
+			fmt.Println("Working round", round+1, "index", idx, "with value/count", numbers[idx])
+			shift(numbers[idx], idx, prevs, nexts)
+			//printNumbers(numbers, nexts)
+		}
+	}
+
+	idx1k := indexPast(1000, zeroIndex, nexts)
+	idx2k := indexPast(1000, idx1k, nexts)
+	idx3k := indexPast(1000, idx2k, nexts)
+	val1k := numbers[idx1k]
+	val2k := numbers[idx2k]
+	val3k := numbers[idx3k]
+	fmt.Println("Value 1k after 0", val1k, "2k", val2k, "3k", val3k, "sum", val1k+val2k+val3k)
+}
diff --git a/solutions/day21/day21.go b/solutions/day21/day21.go
new file mode 100644
index 0000000..f09cfd8
--- /dev/null
+++ b/solutions/day21/day21.go
@@ -0,0 +1,221 @@
+package day21
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+const (
+	OpAdd int = iota
+	OpMul
+	OpSub
+	OpDiv
+	OpTarget
+)
+
+func opString(v int) string {
+	switch v {
+	case OpAdd:
+		return "+"
+	case OpMul:
+		return "*"
+	case OpSub:
+		return "-"
+	case OpDiv:
+		return "/"
+	case OpTarget:
+		return "=="
+	default:
+		return "???????"
+	}
+}
+
+type MonkeyState struct {
+	valueSet  bool
+	value     int
+	operation int
+	left      string
+	right     string
+}
+
+func step(monkeys map[string]MonkeyState) bool {
+	changedSomething := false
+
+	for monkey, state := range monkeys {
+		if !state.valueSet && monkeys[state.left].valueSet && monkeys[state.right].valueSet {
+			switch state.operation {
+			case OpAdd:
+				state.value = monkeys[state.left].value + monkeys[state.right].value
+			case OpSub:
+				state.value = monkeys[state.left].value - monkeys[state.right].value
+			case OpMul:
+				state.value = monkeys[state.left].value * monkeys[state.right].value
+			case OpDiv:
+				state.value = monkeys[state.left].value / monkeys[state.right].value
+			}
+			state.valueSet = true
+			monkeys[monkey] = state
+			changedSomething = true
+		}
+	}
+
+	return changedSomething
+}
+
+func contains(ls []string, x string) bool {
+	for _, tester := range ls {
+		if tester == x {
+			return true
+		}
+	}
+	return false
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	monkeys := map[string]MonkeyState{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		monkey := line[0:4]
+		data := line[6:]
+		value, err := strconv.Atoi(data)
+		if err == nil {
+			monkeys[monkey] = MonkeyState{true, value, 0, "", ""}
+		} else {
+			left := data[0:4]
+			right := data[7:]
+			switch data[5] {
+			case '+':
+				monkeys[monkey] = MonkeyState{false, 0, OpAdd, left, right}
+			case '-':
+				monkeys[monkey] = MonkeyState{false, 0, OpSub, left, right}
+			case '*':
+				monkeys[monkey] = MonkeyState{false, 0, OpMul, left, right}
+			case '/':
+				monkeys[monkey] = MonkeyState{false, 0, OpDiv, left, right}
+			default:
+				fmt.Println("Bad operation", string(data[5]))
+				return
+			}
+		}
+	}
+	file.Close()
+
+	for !monkeys["root"].valueSet {
+		step(monkeys)
+	}
+	fmt.Println("Root monkey value, part 1:", monkeys["root"].value)
+
+	humn := monkeys["humn"]
+	humn.valueSet = false
+	humn.operation = OpTarget
+	monkeys["humn"] = humn
+	unwoundMonkeys := []string{"humn"}
+	updatedSomething := true
+	for updatedSomething {
+		updatedSomething = false
+		for monkey, state := range monkeys {
+			if contains(unwoundMonkeys, state.left) || contains(unwoundMonkeys, state.right) {
+				if state.valueSet {
+					state.valueSet = false
+					monkeys[monkey] = state
+					unwoundMonkeys = append(unwoundMonkeys, monkey)
+					updatedSomething = true
+				}
+			}
+		}
+	}
+
+	fmt.Println("monkeys now", monkeys)
+	var targetValue int
+	var nextNode string
+
+	if monkeys[monkeys["root"].left].valueSet {
+		targetValue = monkeys[monkeys["root"].left].value
+		nextNode = monkeys["root"].right
+		fmt.Println("Root's right is the unknown one", nextNode)
+	} else {
+		targetValue = monkeys[monkeys["root"].right].value
+		nextNode = monkeys["root"].left
+		fmt.Println("Root's left is the unknown one", nextNode)
+	}
+
+	for !monkeys["humn"].valueSet {
+		nextState := monkeys[nextNode]
+
+		if nextState.valueSet {
+			fmt.Println("PANIC: Grounded in a node with the value set")
+			return
+		} else if nextState.operation == OpTarget {
+			nextState.value = targetValue
+			nextState.valueSet = true
+			monkeys[nextNode] = nextState
+		} else if monkeys[nextState.left].valueSet {
+			nextState.value = targetValue
+			nextState.valueSet = true
+			monkeys[nextNode] = nextState
+			switch nextState.operation {
+			case OpAdd:
+				// T = V + X
+				// T - V = X
+				targetValue = targetValue - monkeys[nextState.left].value
+			case OpMul:
+				// T = V * X
+				// T / V = X
+				targetValue = targetValue / monkeys[nextState.left].value
+			case OpSub:
+				// T = V - X
+				// T + X = V
+				// X = V - T
+				targetValue = monkeys[nextState.left].value - targetValue
+			case OpDiv:
+				// T = V / X
+				// TX = V
+				// X = V / T
+				targetValue = monkeys[nextState.left].value / targetValue
+			default:
+				fmt.Println("PANIC: Bad operation in back compute")
+			}
+			nextNode = nextState.right
+		} else if monkeys[nextState.right].valueSet {
+			nextState.value = targetValue
+			nextState.valueSet = true
+			monkeys[nextNode] = nextState
+			switch nextState.operation {
+			case OpAdd:
+				// T = X + V
+				// T - V = X
+				targetValue = targetValue - monkeys[nextState.right].value
+			case OpMul:
+				// T = X * V
+				targetValue = targetValue / monkeys[nextState.right].value
+			case OpSub:
+				// T = X - V
+				// T + V = X
+				targetValue = targetValue + monkeys[nextState.right].value
+			case OpDiv:
+				// T = X / V
+				// TV = X
+				targetValue = targetValue * monkeys[nextState.right].value
+			default:
+				fmt.Println("PANIC: Bad operation in back compute")
+			}
+			nextNode = nextState.left
+		} else {
+			fmt.Println("PANIC: Trouble with a double split in search")
+			return
+		}
+	}
+	fmt.Println("Actually, my value should be", monkeys["humn"].value)
+}
diff --git a/solutions/day22/day22.go b/solutions/day22/day22.go
new file mode 100644
index 0000000..fcc9fff
--- /dev/null
+++ b/solutions/day22/day22.go
@@ -0,0 +1,635 @@
+package day22
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+type Command int
+type Tile int
+type Direction int
+type Face int
+type Board [][]Tile
+type FaceMap map[Face]Board
+
+const (
+	TurnRight Command = -1
+	TurnLeft          = -2
+)
+
+const (
+	Void Tile = iota
+	Empty
+	Wall
+)
+
+const (
+	Right Direction = 0
+	Down            = 1
+	Left            = 2
+	Up              = 3
+)
+
+const (
+	TopFace Face = iota
+	BottomFace
+	LeftFace
+	RightFace
+	FrontFace
+	BackFace
+)
+
+func printBoard(board Board) {
+	for _, row := range board {
+		for _, tile := range row {
+			switch tile {
+			case Void:
+				fmt.Printf(" ")
+			case Empty:
+				fmt.Printf(".")
+			case Wall:
+				fmt.Printf("#")
+			}
+		}
+		fmt.Println()
+	}
+}
+
+func parseCommands(runes []rune) []Command {
+	result := []Command{}
+	accum := 0
+
+	for _, r := range runes {
+		if r >= '0' && r <= '9' {
+			accum = (accum * 10) + int(r-'0')
+		} else {
+			result = append(result, Command(accum))
+			accum = 0
+			if r == 'R' {
+				result = append(result, TurnRight)
+			} else {
+				result = append(result, TurnLeft)
+			}
+		}
+	}
+
+	if accum > 0 {
+		result = append(result, Command(accum))
+	}
+
+	return result
+}
+
+func parseBoardLine(runes []rune) []Tile {
+	result := []Tile{}
+
+	for _, r := range runes {
+		switch r {
+		case ' ':
+			result = append(result, Void)
+		case '.':
+			result = append(result, Empty)
+		case '#':
+			result = append(result, Wall)
+		default:
+			fmt.Println("PANIC: Illegal character in board map", string(r))
+		}
+	}
+
+	return result
+}
+
+func initialPosition(board Board) (x int, y int) {
+	for idx, tile := range board[0] {
+		if tile == Empty {
+			x = idx
+			y = 0
+			return
+		}
+	}
+	fmt.Println("PANIC: Couldn't figure out initial position")
+	x = 0
+	y = 0
+	return
+}
+
+func turn(direction Direction, turn Command) Direction {
+	switch direction {
+	case Up:
+		switch turn {
+		case TurnLeft:
+			return Left
+		case TurnRight:
+			return Right
+		}
+	case Right:
+		switch turn {
+		case TurnLeft:
+			return Up
+		case TurnRight:
+			return Down
+		}
+	case Down:
+		switch turn {
+		case TurnLeft:
+			return Right
+		case TurnRight:
+			return Left
+		}
+	case Left:
+		switch turn {
+		case TurnLeft:
+			return Down
+		case TurnRight:
+			return Up
+		}
+	}
+	fmt.Println("PANIC: turn default WTF")
+	return Down
+}
+
+type State2D struct {
+	x         int
+	y         int
+	direction Direction
+	board     Board
+}
+
+func step2d(count int, state *State2D) {
+	if count == 0 {
+		return
+	}
+
+	keepGoing := true
+
+	switch state.direction {
+	case Right:
+		currentRow := state.board[state.y]
+		tester := (state.x + 1) % len(currentRow)
+		for {
+			if currentRow[tester] == Void {
+				tester = (tester + 1) % len(currentRow)
+				continue
+			} else if currentRow[tester] == Wall {
+				keepGoing = false
+				break
+			} else {
+				(*state).x = tester
+				break
+			}
+		}
+
+	case Left:
+		currentRow := state.board[state.y]
+		tester := state.x - 1
+		for {
+			if tester < 0 {
+				tester = len(currentRow) - 1
+			}
+			if currentRow[tester] == Void {
+				tester -= 1
+				continue
+			} else if currentRow[tester] == Wall {
+				keepGoing = false
+				break
+			} else {
+				(*state).x = tester
+				break
+			}
+		}
+
+	case Up:
+		tester := state.y - 1
+		for {
+			if tester < 0 {
+				tester = len(state.board) - 1
+			}
+			if state.board[tester][state.x] == Void {
+				tester -= 1
+				continue
+			} else if state.board[tester][state.x] == Wall {
+				keepGoing = false
+				break
+			} else {
+				(*state).y = tester
+				break
+			}
+		}
+
+	case Down:
+		fmt.Println("Moving down count is", count, "y value", state.y)
+		tester := (state.y + 1) % len(state.board)
+		for {
+			if state.board[tester][state.x] == Void {
+				tester = (tester + 1) % len(state.board)
+				continue
+			} else if state.board[tester][state.x] == Wall {
+				fmt.Println("Hit wall at tester", tester)
+				keepGoing = false
+				break
+			} else {
+				(*state).y = tester
+				break
+			}
+		}
+
+	default:
+		fmt.Println("BAD")
+	}
+
+	if keepGoing {
+		step2d(count-1, state)
+	}
+}
+
+func copyFace(startX int, startY int, faceSize int, board Board) Board {
+	retval := Board{}
+
+	for y := 0; y < faceSize; y++ {
+		newRow := []Tile{}
+
+		for x := 0; x < faceSize; x++ {
+			newRow = append(newRow, board[y+startY][x+startX])
+		}
+		retval = append(retval, newRow)
+	}
+
+	return retval
+}
+
+func validPoint(x int, y int, board Board) bool {
+	return (x >= 0) && (y >= 0) && (x < len(board[0])) && (y < len(board))
+}
+
+var faceMoves map[Face]map[Direction]Face = map[Face]map[Direction]Face{
+	TopFace: map[Direction]Face{
+		Up:    BackFace,
+		Left:  LeftFace,
+		Right: RightFace,
+		Down:  FrontFace,
+	},
+	BottomFace: map[Direction]Face{
+		Up:    FrontFace,
+		Left:  LeftFace,
+		Right: RightFace,
+		Down:  BackFace,
+	},
+	LeftFace: map[Direction]Face{
+		Up:    TopFace,
+		Left:  BackFace,
+		Right: FrontFace,
+		Down:  BottomFace,
+	},
+	RightFace: map[Direction]Face{
+		Up:    TopFace,
+		Left:  FrontFace,
+		Right: BackFace,
+		Down:  BottomFace,
+	},
+	FrontFace: map[Direction]Face{
+		Up:    TopFace,
+		Left:  LeftFace,
+		Right: RightFace,
+		Down:  BottomFace,
+	},
+	BackFace: map[Direction]Face{
+		Up:    BackFace,
+		Left:  RightFace,
+		Right: FrontFace,
+		Down:  FrontFace,
+	},
+}
+
+var faceName map[Face]string = map[Face]string{
+	TopFace:    "top",
+	BottomFace: "bottom",
+	LeftFace:   "left",
+	RightFace:  "right",
+	FrontFace:  "front",
+	BackFace:   "back",
+}
+
+var dirName map[Direction]string = map[Direction]string{
+	Up:    "up",
+	Down:  "down",
+	Left:  "left",
+	Right: "right",
+}
+
+var tileName map[Tile]string = map[Tile]string{
+	Void:  "void",
+	Empty: "empty",
+	Wall:  "wall",
+}
+
+type State3D struct {
+	x         int
+	y         int
+	face      Face
+	direction Direction
+	board     FaceMap
+}
+
+func translate(x int, y int, faceSize int, face Face, dir Direction) (resx int, resy int, resdir Direction) {
+	switch face {
+	case TopFace:
+		resdir = Down
+		switch dir {
+		case Right, Left:
+			resy = 0
+			resx = y
+		case Up, Down:
+			resy = 0
+			resx = x
+		}
+	case FrontFace:
+		resdir = dir
+		switch dir {
+		case Up:
+			resy = faceSize - 1
+			resx = x
+		case Down:
+			resy = 0
+			resx = x
+		case Left:
+			resy = y
+			resx = faceSize - 1
+		case Right:
+			resy = y
+			resx = 0
+		}
+	case LeftFace:
+		switch dir {
+		case Up:
+			resx = 0
+			resy = x
+			resdir = Right
+		case Down:
+			resx = 0
+			resy = x
+			resdir = Right
+		case Left:
+			resy = y
+			resx = faceSize - 1
+			resdir = Left
+		case Right:
+			resy = y
+			resx = 0
+			resdir = Right
+		}
+	case RightFace:
+		switch dir {
+		case Up:
+			resx = faceSize - 1
+			resy = x
+			resdir = Left
+		case Down:
+			resx = faceSize - 1
+			resy = x
+			resdir = Left
+		case Left:
+			resx = faceSize - 1
+			resy = y
+			resdir = Left
+		case Right:
+			resy = y
+			resx = 0
+			resdir = Right
+		}
+	case BackFace:
+		switch dir {
+		case Up:
+			resx = x
+			resy = 0
+			resdir = Down
+		case Down:
+			resx = x
+			resy = faceSize - 1
+			resdir = Up
+		case Left:
+			resx = faceSize - 1
+			resy = y
+			resdir = Right
+		case Right:
+			resy = y
+			resx = 0
+			resdir = Left
+		}
+	case BottomFace:
+		switch dir {
+		case Up:
+			resx = x
+			resy = faceSize - 1
+			resdir = Up
+		case Down:
+			resx = x
+			resy = faceSize - 1
+			resdir = Up
+		case Left:
+			resx = y
+			resy = faceSize - 1
+			resdir = Up
+		case Right:
+			resy = faceSize - 1
+			resx = y
+			resdir = Up
+		}
+	}
+
+	return
+}
+
+func step3d(count int, state *State3D) {
+	if count == 0 {
+		return
+	}
+
+	for i := 0; i < count; i++ {
+		newX := state.x
+		newY := state.y
+		newFace := state.face
+		newDirection := state.direction
+
+		switch state.direction {
+		case Up:
+			newY -= 1
+		case Down:
+			newY += 1
+		case Left:
+			newX -= 1
+		case Right:
+			newX += 1
+		}
+
+		if !validPoint(newX, newY, state.board[state.face]) {
+			newFace = faceMoves[state.face][state.direction]
+			newX, newY, newDirection = translate(newX, newY, len(state.board[state.face]), state.face, state.direction)
+		}
+		fmt.Printf("(%d, %d) going %s on %s ---> (%d, %d) going %s on %s [%s]\n", state.x, state.y, dirName[state.direction], faceName[state.face], newX, newY, dirName[newDirection], faceName[newFace], tileName[state.board[newFace][newY][state.x]])
+
+		if state.board[newFace][newY][newX] == Wall {
+			return
+		}
+
+		(*state).x = newX
+		(*state).y = newY
+		(*state).face = newFace
+		(*state).direction = newDirection
+	}
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	var commands []Command
+	initialBoard := Board{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		runes := []rune(line)
+
+		if len(runes) > 0 {
+			if runes[0] >= '0' && runes[0] <= '9' {
+				commands = parseCommands(runes)
+			} else {
+				initialBoard = append(initialBoard, parseBoardLine(runes))
+			}
+		}
+	}
+	file.Close()
+
+	maximumRowLength := 0
+	for _, row := range initialBoard {
+		if len(row) > maximumRowLength {
+			maximumRowLength = len(row)
+		}
+	}
+
+	board := Board{}
+
+	for _, row := range initialBoard {
+		for len(row) < maximumRowLength {
+			row = append(row, Void)
+		}
+		board = append(board, row)
+	}
+
+	printBoard(board)
+
+	startX, startY := initialPosition(board)
+	x, y := startX, startY
+	fmt.Println("initial position is", x, y)
+	state := State2D{x, y, Right, board}
+	for _, command := range commands {
+		fmt.Println("x", state.x, "y", state.y, "direction", dirName[state.direction])
+		fmt.Println("Running", command)
+		switch command {
+		case TurnRight:
+			state.direction = turn(state.direction, TurnRight)
+		case TurnLeft:
+			state.direction = turn(state.direction, TurnLeft)
+		default:
+			step2d(int(command), &state)
+		}
+	}
+
+	finalRow := state.y + 1
+	finalColumn := state.x + 1
+	finalPassword := 1000*finalRow + 4*finalColumn + int(state.direction)
+	fmt.Println("Final row is", finalRow, "final column is", finalColumn, "final password is", finalPassword)
+
+	narrowestSection := len(board[0])
+	for _, row := range board {
+		startIdx := -1
+		endIdx := -1
+
+		for idx, tile := range row {
+			if tile != Void && startIdx == -1 {
+				startIdx = idx
+			}
+
+			if tile == Void && (startIdx != -1) && (endIdx == -1) {
+				endIdx = idx
+			}
+		}
+
+		if endIdx == -1 {
+			endIdx = len(row) - 1
+		}
+
+		if (endIdx - startIdx) < narrowestSection {
+			narrowestSection = endIdx - startIdx
+		}
+	}
+
+	cubeFaceSize := narrowestSection
+	fmt.Println("Cube face size is", cubeFaceSize)
+
+	faceMap := FaceMap{}
+	currentFace := TopFace
+	currentSpineX := startX
+	currentSpineY := startY
+
+	for validPoint(currentSpineX, currentSpineY, board) {
+		faceMap[currentFace] = copyFace(currentSpineX, currentSpineY, cubeFaceSize, board)
+		fmt.Printf("Found %s face at (%d,%d)\n", faceName[currentFace], currentSpineX, currentSpineY)
+
+		leftwardsFace := faceMoves[currentFace][Left]
+		for leftX := currentSpineX - cubeFaceSize; validPoint(leftX, currentSpineY, board) && board[currentSpineY][leftX] != Void; leftX -= cubeFaceSize {
+			faceMap[leftwardsFace] = copyFace(leftX, currentSpineY, cubeFaceSize, board)
+			fmt.Printf("Found %s face at (%d,%d)\n", faceName[leftwardsFace], leftX, currentSpineY)
+			fmt.Println("Moving face", faceName[leftwardsFace], "left to", faceName[faceMoves[leftwardsFace][Left]])
+			leftwardsFace = faceMoves[leftwardsFace][Left]
+		}
+
+		rightwardsFace := faceMoves[currentFace][Right]
+		for rightX := currentSpineX + cubeFaceSize; validPoint(rightX, currentSpineY, board) && board[currentSpineY][rightX] != Void; rightX += cubeFaceSize {
+			faceMap[rightwardsFace] = copyFace(rightX, currentSpineY, cubeFaceSize, board)
+			fmt.Printf("Found %s face at (%d,%d)\n", faceName[rightwardsFace], rightX, currentSpineY)
+			fmt.Println("Moving face", faceName[rightwardsFace], "right to", faceName[faceMoves[rightwardsFace][Left]])
+			rightwardsFace = faceMoves[rightwardsFace][Right]
+		}
+
+		currentSpineY += cubeFaceSize
+		fmt.Println("Moving face", faceName[currentFace], "down to", faceName[faceMoves[currentFace][Down]])
+		currentFace = faceMoves[currentFace][Down]
+	}
+
+	if len(faceMap) != 6 {
+		fmt.Println("COULD NOT FIND ALL SIX FACES")
+		return
+	}
+
+	for face, board := range faceMap {
+		fmt.Println("Board", faceName[face])
+		printBoard(board)
+	}
+
+	fmt.Println("initial position is", x, y)
+	state3 := State3D{0, 0, TopFace, Right, faceMap}
+	for _, command := range commands {
+		fmt.Println("x", state3.x, "y", state3.y, "face", faceName[state3.face], "direction", dirName[state3.direction])
+		fmt.Println("Running", command)
+		switch command {
+		case TurnRight:
+			state3.direction = turn(state3.direction, TurnRight)
+		case TurnLeft:
+			state3.direction = turn(state3.direction, TurnLeft)
+		default:
+			step3d(int(command), &state3)
+		}
+	}
+
+	finalRow = state3.y + 1
+	finalColumn = state3.x + 1
+	finalPassword = 1000*finalRow + 4*finalColumn + int(state.direction)
+	fmt.Println("Final row is", finalRow, "final column is", finalColumn, "final password is", finalPassword)
+
+}
diff --git a/solutions/day23/day23.go b/solutions/day23/day23.go
new file mode 100644
index 0000000..3922ad2
--- /dev/null
+++ b/solutions/day23/day23.go
@@ -0,0 +1,237 @@
+package day23
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+type Direction int
+
+const (
+	North Direction = iota
+	South
+	East
+	West
+)
+
+type Point struct {
+	x int
+	y int
+}
+
+type ElfLocations map[Point]bool
+
+func extents(locations ElfLocations) (topLeft Point, bottomRight Point) {
+	lowestX := 1000000000000000000
+	highestX := -1000000000000000000
+	lowestY := 1000000000000000000
+	highestY := -1000000000000000000
+
+	for location := range locations {
+		if location.x < lowestX {
+			lowestX = location.x
+		}
+
+		if location.x > highestX {
+			highestX = location.x
+		}
+
+		if location.y < lowestY {
+			lowestY = location.y
+		}
+
+		if location.y > highestY {
+			highestY = location.y
+		}
+	}
+
+	topLeft = Point{lowestX, lowestY}
+	bottomRight = Point{highestX, highestY}
+	return
+}
+
+func hasElf(x int, y int, locations ElfLocations) bool {
+	_, exists := locations[Point{x, y}]
+	return exists
+}
+
+func printMap(locations ElfLocations) {
+	topLeft, bottomRight := extents(locations)
+
+	fmt.Println("top left", topLeft)
+	fmt.Println("bottom right", bottomRight)
+	for y := topLeft.y; y <= bottomRight.y; y++ {
+		for x := topLeft.x; x <= bottomRight.x; x++ {
+			if hasElf(x, y, locations) {
+				fmt.Printf("#")
+			} else {
+				fmt.Printf(".")
+			}
+		}
+		fmt.Println()
+	}
+}
+
+func directionIsEmpty(direction Direction, x int, y int, locations ElfLocations) bool {
+	switch direction {
+	case North:
+		return !hasElf(x-1, y-1, locations) && !hasElf(x, y-1, locations) && !hasElf(x+1, y-1, locations)
+	case South:
+		return !hasElf(x-1, y+1, locations) && !hasElf(x, y+1, locations) && !hasElf(x+1, y+1, locations)
+	case West:
+		return !hasElf(x-1, y-1, locations) && !hasElf(x-1, y, locations) && !hasElf(x-1, y+1, locations)
+	case East:
+		return !hasElf(x+1, y-1, locations) && !hasElf(x+1, y, locations) && !hasElf(x+1, y+1, locations)
+	}
+	return false
+}
+
+func showDirection(dir *Direction) string {
+	if dir == nil {
+		return "<nil>"
+	}
+
+	switch *dir {
+	case North:
+		return "north"
+	case South:
+		return "south"
+	case East:
+		return "east"
+	case West:
+		return "west"
+	}
+
+	return "<???>"
+}
+
+func proposeMove(x int, y int, directionPreference []Direction, locations ElfLocations) *Point {
+	var firstEmpty *Direction = nil
+	allEmpty := true
+
+	for _, dir := range directionPreference {
+		if directionIsEmpty(dir, x, y, locations) {
+			if firstEmpty == nil {
+				firstEmpty = new(Direction)
+				*firstEmpty = dir
+			}
+		} else {
+			allEmpty = false
+		}
+	}
+
+	if allEmpty {
+		return nil
+	}
+
+	if firstEmpty == nil {
+		return nil
+	}
+
+	switch *firstEmpty {
+	case North:
+		return &Point{x, y - 1}
+	case South:
+		return &Point{x, y + 1}
+	case East:
+		return &Point{x + 1, y}
+	case West:
+		return &Point{x - 1, y}
+	}
+
+	fmt.Println("PANIC: fell through?!")
+	return nil
+}
+
+func runRound(locations ElfLocations, preferredDirections []Direction) (newLocations ElfLocations, done bool) {
+	suggestedMoves := map[Point]Point{}
+	takenPoints := map[Point]int{}
+
+	for location := range locations {
+		proposed := proposeMove(location.x, location.y, preferredDirections, locations)
+		if proposed != nil {
+			fmt.Println("Proposed to move", location, "to", proposed)
+			suggestedMoves[location] = *proposed
+			curVal := takenPoints[*proposed]
+			takenPoints[*proposed] = curVal + 1
+		}
+	}
+
+	newLocations = ElfLocations{}
+	done = true
+	for originalLocation := range locations {
+		newPlace, hasNewPlace := suggestedMoves[originalLocation]
+		if hasNewPlace && takenPoints[newPlace] <= 1 {
+			newLocations[newPlace] = true
+			done = false
+		} else {
+			newLocations[originalLocation] = true
+		}
+	}
+
+	return
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	elfLocations := ElfLocations{}
+	y := 0
+
+	for scanner.Scan() {
+		line := []rune(scanner.Text())
+
+		for x, r := range line {
+			if r == '#' {
+				elfLocations[Point{x, y}] = true
+			}
+		}
+		y += 1
+	}
+	file.Close()
+
+	preferredDirections := []Direction{North, South, West, East}
+	for i := 0; i < 10; i++ {
+		fmt.Println("Round", i)
+		printMap(elfLocations)
+		newLocations, done := runRound(elfLocations, preferredDirections)
+		preferredDirections = append(preferredDirections[1:], preferredDirections[0])
+		if done {
+			fmt.Println("No one moves after this round, so we're done.")
+			break
+		}
+		elfLocations = newLocations
+	}
+	printMap(elfLocations)
+
+	topLeft, bottomRight := extents(elfLocations)
+	emptyGround := 0
+	for x := topLeft.x; x <= bottomRight.x; x++ {
+		for y := topLeft.y; y <= bottomRight.y; y++ {
+			if !hasElf(x, y, elfLocations) {
+				emptyGround += 1
+			}
+		}
+	}
+	fmt.Println(emptyGround, "empty spots in smallest bounding box.")
+
+	round := 11
+	for {
+		fmt.Println("Starting round", round)
+		newLocations, done := runRound(elfLocations, preferredDirections)
+		if done {
+			fmt.Println("No one moved after round", round)
+			break
+		}
+		elfLocations = newLocations
+		preferredDirections = append(preferredDirections[1:], preferredDirections[0])
+		round += 1
+	}
+}
diff --git a/solutions/day3/day3.go b/solutions/day3/day3.go
new file mode 100644
index 0000000..d5dcc32
--- /dev/null
+++ b/solutions/day3/day3.go
@@ -0,0 +1,92 @@
+package day3
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func in_set(target rune, set []rune) bool {
+	for _, char := range set {
+		if char == target {
+			return true
+		}
+	}
+	return false
+}
+
+func priority(value rune) int {
+	var base_value int = 0
+
+	if value >= 'A' && value <= 'Z' {
+		base_value = int('A') - 27
+	}
+
+	if value >= 'a' && value <= 'z' {
+		base_value = int('a') - 1
+	}
+
+	return int(value) - base_value
+}
+
+func part1_addition(runes []rune) int {
+	var total int = 0
+
+	midpoint := len(runes) / 2
+	left_runes := runes[0:midpoint]
+	right_runes := runes[midpoint:]
+
+	for pos, char := range left_runes {
+		if !in_set(char, left_runes[0:pos]) {
+			if in_set(char, right_runes) {
+				total += priority(char)
+			}
+		}
+	}
+
+	return total
+}
+
+func score_badge(set1 []rune, set2 []rune, set3 []rune) int {
+	for pos, char := range set1 {
+		if !in_set(char, set1[0:pos]) {
+			if in_set(char, set2) && in_set(char, set3) {
+				return priority(char)
+			}
+		}
+	}
+	fmt.Println("PANIC: Couldn't find overlapping badge item")
+	return 0
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	var total_overlap int = 0
+	var total_badge int = 0
+	var grouping [][]rune = [][]rune{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		runes := []rune(line)
+		total_overlap += part1_addition(runes)
+
+		grouping = append(grouping, runes)
+		if len(grouping) == 3 {
+			total_badge += score_badge(grouping[0], grouping[1], grouping[2])
+			grouping = [][]rune{}
+		}
+	}
+
+	file.Close()
+
+	fmt.Println("Total initial score is", total_overlap)
+	fmt.Println("Total badge score is", total_badge)
+}
diff --git a/solutions/day4/day4.go b/solutions/day4/day4.go
new file mode 100644
index 0000000..eee62e3
--- /dev/null
+++ b/solutions/day4/day4.go
@@ -0,0 +1,114 @@
+package day4
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type SectionRange struct {
+	start int
+	end   int
+}
+
+func total_overlap(a SectionRange, b SectionRange) bool {
+	return ((a.start >= b.start) && (a.end <= b.end)) ||
+		((b.start >= a.start) && (b.end <= a.end))
+}
+
+func partial_overlap(a SectionRange, b SectionRange) bool {
+	return (a.start >= b.start && a.start <= b.end) ||
+		(a.end >= b.end && a.end <= b.end) ||
+		(b.start >= a.start && b.start <= a.end) ||
+		(b.end >= a.start && b.end <= a.end)
+}
+
+func range_from_string(s string) (ret_range SectionRange, err error) {
+	ret_range = SectionRange{0, 0}
+	items := strings.Split(s, "-")
+
+	if len(items) != 2 {
+		err = errors.New("invalid range format")
+		return
+	}
+
+	start, start_err := strconv.Atoi(items[0])
+	if start_err != nil {
+		err = start_err
+		return
+	}
+	ret_range.start = start
+
+	end, end_err := strconv.Atoi(items[1])
+	if end_err != nil {
+		err = end_err
+		return
+	}
+	ret_range.end = end
+
+	err = nil
+
+	return
+}
+
+func line_to_pair(s string) (left SectionRange, right SectionRange, err error) {
+	items := strings.Split(s, ",")
+
+	if len(items) != 2 {
+		err = errors.New("invalid range format")
+		return
+	}
+
+	left, left_err := range_from_string(items[0])
+	if left_err != nil {
+		err = left_err
+		return
+	}
+
+	right, right_err := range_from_string(items[1])
+	if right_err != nil {
+		err = right_err
+		return
+	}
+
+	return
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	var total_overlapping int = 0
+	var partial_overlapping int = 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		left, right, err := line_to_pair(line)
+
+		if err != nil {
+			fmt.Println("ERROR: failed to parse line:", err)
+		} else {
+			if total_overlap(left, right) {
+				total_overlapping += 1
+			}
+
+			if partial_overlap(left, right) {
+				partial_overlapping += 1
+			}
+		}
+	}
+
+	file.Close()
+
+	fmt.Println("# of overlapping pairs", total_overlapping)
+	fmt.Println("# of partially overlapping pairs", partial_overlapping)
+}
diff --git a/solutions/day5/day5.go b/solutions/day5/day5.go
new file mode 100644
index 0000000..accb527
--- /dev/null
+++ b/solutions/day5/day5.go
@@ -0,0 +1,282 @@
+package day5
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"unicode"
+)
+
+type Stack struct {
+	identity rune
+	then     *Stack
+}
+
+func newStack() *Stack {
+	return nil
+}
+
+func push(box rune, stack *Stack) *Stack {
+	var retval *Stack = new(Stack)
+	retval.identity = box
+	retval.then = stack
+	return retval
+}
+
+func pushToEnd(box rune, stack *Stack) *Stack {
+	if stack == nil {
+		retval := new(Stack)
+		retval.identity = box
+		retval.then = nil
+		return retval
+	} else {
+		stack.then = pushToEnd(box, stack.then)
+		return stack
+	}
+}
+
+func pushSet(front *Stack, stack *Stack) *Stack {
+	var prev *Stack = nil
+	current := front
+
+	for current != nil {
+		prev = current
+		current = current.then
+	}
+
+	if prev == nil {
+		return stack
+	} else {
+		prev.then = stack
+	}
+
+	return front
+}
+
+func pop(stack *Stack) (newStack *Stack, value rune, err error) {
+	if stack == nil {
+		newStack = nil
+		value = 'X'
+		err = errors.New("attempt to pop from empty stack")
+		return
+	}
+
+	value = stack.identity
+	newStack = stack.then
+	return
+}
+
+func popSet(amt int, stack *Stack) (newStack *Stack, set *Stack, err error) {
+	var prev *Stack = nil
+	var current *Stack = stack
+
+	for i := 0; i < amt; i++ {
+		if current == nil {
+			err = errors.New("tried to take more items than existed in stack")
+			return
+		}
+
+		prev = current
+		current = current.then
+	}
+
+	if prev != nil {
+		set = stack
+		prev.then = nil
+	} else {
+		set = nil
+	}
+	newStack = current
+
+	return
+}
+
+func stackLength(stack *Stack) int {
+	if stack == nil {
+		return 0
+	} else {
+		return 1 + stackLength(stack.then)
+	}
+}
+
+type Workspace []*Stack
+
+func addLine(line string, input *Workspace) (err error) {
+	currentColumn := 0
+
+	fmt.Println("Workspace line's length is", len(line))
+	for len(line) >= 3 {
+		fmt.Println("  line length now", len(line))
+		// make sure we've got enough space in the workspace
+		for currentColumn+1 >= len(*input) {
+			*input = append(*input, newStack())
+		}
+
+		// see if there's actually something there
+		if line[0] == '[' && unicode.IsLetter(rune(line[1])) {
+			fmt.Println("Adding", rune(line[1]), "to column", currentColumn)
+			(*input)[currentColumn] = pushToEnd(rune(line[1]), (*input)[currentColumn])
+		} else if line[0] != ' ' {
+			err = errors.New("doesn't start with square or blank")
+			return
+		}
+
+		currentColumn += 1
+		if len(line) == 3 {
+			return
+		}
+
+		if len(line) > 3 {
+			line = line[4:]
+		}
+	}
+
+	return
+}
+
+func runMove(problem int, move OperatorMove, workspace *Workspace) error {
+	switch problem {
+	case 1:
+		for i := 0; i < move.count; i++ {
+			newFrom, value, err := pop((*workspace)[move.from])
+			if err != nil {
+				return err
+			}
+			(*workspace)[move.from] = newFrom
+			(*workspace)[move.to] = push(value, (*workspace)[move.to])
+		}
+		return nil
+
+	case 2:
+		newFrom, poppedSet, err := popSet(move.count, (*workspace)[move.from])
+		if err != nil {
+			return err
+		}
+		(*workspace)[move.from] = newFrom
+		(*workspace)[move.to] = pushSet(poppedSet, (*workspace)[move.to])
+		return nil
+
+	default:
+		return errors.New("weird problem number found in runMove")
+	}
+}
+
+func printWorkspace(input Workspace) {
+	maxLength := 0
+
+	for _, element := range input {
+		current := stackLength(element)
+		if current > maxLength {
+			maxLength = current
+		}
+	}
+
+	for _, element := range input {
+		current := stackLength(element)
+		blanks := maxLength - current
+		outputString := ""
+
+		for i := 0; i < blanks; i++ {
+			outputString = outputString + "    "
+		}
+
+		node := element
+		for node != nil {
+			outputString = outputString + fmt.Sprintf("[%c] ", node.identity)
+			node = node.then
+		}
+
+		fmt.Println(outputString)
+	}
+
+}
+
+type OperatorMove struct {
+	count int
+	from  int
+	to    int
+}
+
+func parseMove(line string) (move OperatorMove, err error) {
+	words := strings.Split(line, " ")
+
+	if len(words) != 6 {
+		err = errors.New("wrong number of words in move line")
+		return
+	}
+
+	if words[0] != "move" || words[2] != "from" || words[4] != "to" {
+		err = fmt.Errorf("illegal words in move line: %s/%s/%s", words[0], words[2], words[4])
+		return
+	}
+
+	count, cerr := strconv.Atoi(words[1])
+	from, ferr := strconv.Atoi(words[3])
+	to, terr := strconv.Atoi(words[5])
+
+	if cerr != nil || ferr != nil || terr != nil {
+		err = fmt.Errorf("illegal number found: %s/%s/%s", words[1], words[3], words[5])
+	}
+
+	move = OperatorMove{count, from - 1, to - 1}
+
+	return
+}
+
+func Run(filename string, problemStr string) {
+	problem, err := strconv.Atoi(problemStr)
+	if err != nil || (problem < 1 || problem > 2) {
+		fmt.Println("Didn't understand problem number", os.Args[2], "should be 1 or 2")
+	}
+
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	workspace := new(Workspace)
+	moves := []OperatorMove{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if strings.Contains(line, "[") {
+			fmt.Println("Adding workspace line")
+			addLine(line, workspace)
+		} else {
+			move, err := parseMove(line)
+
+			if err == nil {
+				fmt.Println("Adding move", move)
+				moves = append(moves, move)
+			} else {
+				fmt.Println("Skipping dead line")
+			}
+		}
+	}
+
+	file.Close()
+
+	printWorkspace(*workspace)
+	for count, move := range moves {
+		fmt.Println("-----", count+1, "-----")
+		runMove(problem, move, workspace)
+		printWorkspace(*workspace)
+	}
+
+	resultString := ""
+	for _, stack := range *workspace {
+		if stack == nil {
+			resultString += "*"
+		} else {
+			resultString += fmt.Sprintf("%c", rune((*stack).identity))
+		}
+	}
+	fmt.Println("Final string is", resultString)
+}
diff --git a/solutions/day6/day6.go b/solutions/day6/day6.go
new file mode 100644
index 0000000..6422e20
--- /dev/null
+++ b/solutions/day6/day6.go
@@ -0,0 +1,58 @@
+package day6
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func allDifferent(a string) bool {
+	length := len(a)
+
+	for i := 0; i < length; i++ {
+		for j := i + 1; j < length; j++ {
+			if a[i] == a[j] {
+				return false
+			}
+		}
+	}
+
+	return true
+}
+
+func Run(filename string, problemStr string) {
+	problem, err := strconv.Atoi(problemStr)
+	if err != nil || !(problem == 4 || problem == 14) {
+		fmt.Println("Didn't understand problem number", os.Args[2], "should be 4 or 14")
+	}
+
+	file, err := os.Open(filename)
+
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if len(line) > 0 {
+			var index int
+			offset := problem - 1
+
+			for index = offset; index < len(line); index++ {
+				if allDifferent(line[index-offset : index+1]) {
+					break
+				}
+			}
+
+			fmt.Println("First marker after character", index+1)
+		}
+	}
+
+	file.Close()
+}
diff --git a/solutions/day7/day7.go b/solutions/day7/day7.go
new file mode 100644
index 0000000..511519f
--- /dev/null
+++ b/solutions/day7/day7.go
@@ -0,0 +1,159 @@
+package day7
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type FileSystem struct {
+	name           string
+	parent         *FileSystem
+	subdirectories []*FileSystem
+	files          []FileInfo
+}
+
+func newFileSystem(name string, parent *FileSystem) *FileSystem {
+	return &FileSystem{name, parent, []*FileSystem{}, []FileInfo{}}
+}
+
+func printFileTree(tree *FileSystem, prefix string) {
+	fmt.Println(prefix, "-", tree.name, fmt.Sprintf("(dir size=%d)", totalSize(tree)))
+
+	for _, file := range tree.files {
+		fmt.Println(prefix, " ", "-", file.name, fmt.Sprintf("(file, size=%d)", file.size))
+	}
+
+	for _, dir := range tree.subdirectories {
+		printFileTree(dir, prefix+"  ")
+	}
+}
+
+func totalSize(tree *FileSystem) int {
+	total := 0
+
+	for _, file := range tree.files {
+		total += file.size
+	}
+
+	for _, dir := range tree.subdirectories {
+		total += totalSize(dir)
+	}
+
+	return total
+}
+
+func computePart1(tree *FileSystem) int {
+	result := 0
+
+	for _, dir := range tree.subdirectories {
+		result += computePart1(dir)
+	}
+
+	currentSize := totalSize(tree)
+	if currentSize <= 100000 {
+		result += currentSize
+	}
+
+	return result
+}
+
+func computePart2(tree *FileSystem, size int) int {
+	result := 70000000
+
+	for _, dir := range tree.subdirectories {
+		subResult := computePart2(dir, size)
+		if subResult < result {
+			result = subResult
+		}
+	}
+
+	currentSize := totalSize(tree)
+	if currentSize > size && currentSize < result {
+		result = currentSize
+	}
+
+	return result
+}
+
+type FileInfo struct {
+	name string
+	size int
+}
+
+func parseFileInfo(line string) (result FileInfo, err error) {
+	splits := strings.Split(line, " ")
+	if len(splits) != 2 {
+		err = errors.New("too many values from file info split")
+		return
+	}
+
+	size, err := strconv.Atoi(splits[0])
+	if err != nil {
+		err = errors.New(fmt.Sprintf("could not parse file size: '%s'", splits[0]))
+		return
+	}
+
+	result = FileInfo{splits[1], size}
+	return
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	root := newFileSystem("/", nil)
+	current := root
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		fmt.Println("line", line)
+		if strings.HasPrefix(line, "$ cd /") {
+			current = root
+		} else if strings.HasPrefix(line, "$ cd ..") {
+			current = current.parent
+		} else if strings.HasPrefix(line, "$ cd ") {
+			for _, subdir := range current.subdirectories {
+				if subdir.name == line[5:] {
+					current = subdir
+					continue
+				}
+			}
+		} else if strings.HasPrefix(line, "$ ls") {
+			// don't do anything
+		} else if strings.HasPrefix(line, "dir ") {
+			newTree := newFileSystem(line[4:], current)
+			current.subdirectories = append(current.subdirectories, newTree)
+		} else {
+			fileInfo, err := parseFileInfo(line)
+			if err != nil {
+				fmt.Println("PANIC:", err)
+				return
+			}
+
+			current.files = append((*current).files, fileInfo)
+		}
+	}
+
+	file.Close()
+
+	printFileTree(root, "")
+	fmt.Println("example first part", computePart1(root))
+
+	unusedSpace := 70000000 - totalSize(root)
+	fmt.Println("unused space is currently", unusedSpace)
+	needToGet := 30000000 - unusedSpace
+	fmt.Println("need to find a directory at least", needToGet, "bytes big")
+	fmt.Println("that directory has size", computePart2(root, needToGet))
+
+}
diff --git a/solutions/day8/day8.go b/solutions/day8/day8.go
new file mode 100644
index 0000000..092d66f
--- /dev/null
+++ b/solutions/day8/day8.go
@@ -0,0 +1,142 @@
+package day8
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func isVisible(treeMap [][]int, x int, y int) bool {
+	treeHeight := treeMap[y][x]
+
+	left_test := true
+	for trial := 0; trial < x; trial++ {
+		left_test = left_test && treeMap[y][trial] < treeHeight
+	}
+
+	right_test := true
+	for trial := x + 1; trial < len(treeMap[y]); trial++ {
+		right_test = right_test && treeMap[y][trial] < treeHeight
+	}
+
+	up_test := true
+	for trial := 0; trial < y; trial++ {
+		up_test = up_test && treeMap[trial][x] < treeHeight
+	}
+
+	down_test := true
+	for trial := y + 1; trial < len(treeMap); trial++ {
+		down_test = down_test && treeMap[trial][x] < treeHeight
+	}
+	fmt.Println("Test for x", x, "y", y, "which has height", treeHeight, "tests are", left_test, right_test, up_test, down_test)
+
+	return (left_test || right_test || up_test || down_test)
+}
+
+func score(treeMap [][]int, x int, y int) int {
+	treeHeight := treeMap[y][x]
+
+	if x == 0 || y == 0 {
+		return 0
+	}
+
+	final := 1
+
+	score := 0
+	for trial := x - 1; trial >= 0; trial-- {
+		if treeMap[y][trial] >= treeHeight {
+			score += 1
+			break
+		}
+		score += 1
+	}
+	final *= score
+
+	score = 0
+	for trial := x + 1; trial < len(treeMap[y]); trial++ {
+		if treeMap[y][trial] >= treeHeight {
+			score += 1
+			break
+		}
+		score += 1
+	}
+	final *= score
+
+	score = 0
+	for trial := y - 1; trial >= 0; trial-- {
+		if treeMap[trial][x] >= treeHeight {
+			score += 1
+			break
+		}
+		score += 1
+	}
+	final *= score
+
+	score = 0
+	for trial := y + 1; trial < len(treeMap); trial++ {
+		if treeMap[trial][x] >= treeHeight {
+			score += 1
+			break
+		}
+		score += 1
+	}
+	final *= score
+
+	return final
+}
+
+func Run(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	treeMap := [][]int{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		row := []int{}
+		for _, c := range line {
+			value, err := strconv.Atoi(string(c))
+			if err != nil {
+				fmt.Println("PANIC: bad character")
+				return
+			}
+			row = append(row, value)
+		}
+		treeMap = append(treeMap, row)
+	}
+
+	file.Close()
+
+	width := len(treeMap[0])
+	height := len(treeMap)
+
+	visibleTrees := 2*width + 2*height - 4
+	bestScore := 1
+
+	for y := 1; y < (height - 1); y++ {
+		for x := 1; x < (width - 1); x++ {
+			if isVisible(treeMap, x, y) {
+				visibleTrees += 1
+				//fmt.Printf("*")
+			} else {
+				//fmt.Printf("%d", treeMap[y][x])
+			}
+
+			current := score(treeMap, x, y)
+			if current > bestScore {
+				bestScore = current
+			}
+		}
+		//fmt.Println()
+	}
+
+	fmt.Println("There are", visibleTrees, "visible trees")
+	fmt.Println("Best score is", bestScore)
+}
diff --git a/solutions/day9/day9.go b/solutions/day9/day9.go
new file mode 100644
index 0000000..825c5df
--- /dev/null
+++ b/solutions/day9/day9.go
@@ -0,0 +1,153 @@
+package day9
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+type Point struct {
+	x int
+	y int
+}
+
+func makeSnake(length int) []*Point {
+	snake := []*Point{}
+
+	for i := 0; i < length; i++ {
+		snake = append(snake, &Point{0, 0})
+	}
+
+	return snake
+}
+
+func move(direction rune, point *Point) {
+	switch direction {
+	case 'U':
+		point.y -= 1
+	case 'R':
+		point.x += 1
+	case 'D':
+		point.y += 1
+	case 'L':
+		point.x -= 1
+	default:
+		fmt.Println("PANIC! Bad direction", string(direction))
+	}
+}
+
+func abs(x int) int {
+	if x >= 0 {
+		return x
+	} else {
+		return -x
+	}
+}
+
+func areTouching(head *Point, tail *Point) bool {
+	return abs(head.x-tail.x) <= 1 && abs(head.y-tail.y) <= 1
+}
+
+func updateTail(head *Point, tail *Point) {
+	if areTouching(head, tail) {
+		return
+	}
+
+	if head.x == tail.x {
+		if head.y <= tail.y-2 {
+			tail.y -= 1
+			return
+		}
+
+		if head.y >= tail.y+2 {
+			tail.y += 1
+			return
+		}
+	}
+
+	if head.y == tail.y {
+		if head.x <= tail.x-2 {
+			tail.x -= 1
+			return
+		}
+		if head.x >= tail.x+2 {
+			tail.x += 1
+			return
+		}
+	}
+
+	proposedTails := []Point{
+		{tail.x - 1, tail.y - 1},
+		{tail.x - 1, tail.y + 1},
+		{tail.x + 1, tail.y - 1},
+		{tail.x + 1, tail.y + 1}}
+
+	for _, proposed := range proposedTails {
+		if areTouching(head, &proposed) {
+			tail.x = proposed.x
+			tail.y = proposed.y
+			return
+		}
+	}
+
+	fmt.Println("PANIC, couldn't figure out next step for", *head, "and", *tail)
+}
+
+func contains(array *[]Point, point Point) bool {
+	for _, val := range *array {
+		if val == point {
+			return true
+		}
+	}
+	return false
+}
+
+func runMove(direction rune, amount int, snake []*Point, visitedPoints *[]Point) {
+	for i := 0; i < amount; i++ {
+		move(direction, snake[0])
+		for t := 1; t < len(snake); t++ {
+			updateTail(snake[t-1], snake[t])
+		}
+		lastPoint := snake[len(snake)-1]
+		if !contains(visitedPoints, *lastPoint) {
+			*visitedPoints = append(*visitedPoints, *lastPoint)
+		}
+	}
+}
+
+func Run(filename string, lengthStr string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Error opening file:", err)
+		return
+	}
+
+	snakeLength, err := strconv.Atoi(lengthStr)
+	if err != nil {
+		fmt.Println("Error parsing snake length:", err)
+		return
+	}
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+
+	snake := makeSnake(snakeLength)
+	visitedPoints := []Point{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		amount, err := strconv.Atoi(line[2:])
+		if err != nil {
+			fmt.Println("Could not parse argument", line)
+			return
+		}
+
+		runMove(rune(line[0]), amount, snake, &visitedPoints)
+	}
+
+	fmt.Println("The tail visited", len(visitedPoints), "points")
+
+	file.Close()
+}