From 720aa224c5a65506192a1ee21383d05bc8198ffd Mon Sep 17 00:00:00 2001
From: Adam Wick <awick@uhsure.com>
Date: Fri, 13 Dec 2019 18:01:45 -0800
Subject: [PATCH] Day 1.

---
 .gitignore  |   2 ++
 Cargo.toml  |  10 ++++++
 inputs/day1 | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs |  69 ++++++++++++++++++++++++++++++++++++
 4 files changed, 181 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.toml
 create mode 100644 inputs/day1
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1e7caa9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+Cargo.lock
+target/
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2bdacd2
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "aoc"
+version = "0.1.0"
+authors = ["awick"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = "^2.33.0"
diff --git a/inputs/day1 b/inputs/day1
new file mode 100644
index 0000000..eb73ad9
--- /dev/null
+++ b/inputs/day1
@@ -0,0 +1,100 @@
+129880
+115705
+118585
+124631
+81050
+138183
+61173
+95354
+130788
+89082
+75554
+110104
+140528
+71783
+125889
+126602
+73089
+76822
+51774
+85940
+81004
+149584
+145921
+105570
+142370
+80823
+147779
+115651
+70250
+67763
+128192
+51298
+134963
+73510
+90976
+141216
+65134
+140468
+143998
+101711
+88477
+53335
+138328
+141186
+149804
+64950
+53107
+54648
+97557
+85927
+125038
+80514
+64912
+140591
+114229
+57089
+123464
+127572
+137169
+146550
+51138
+115504
+128034
+147244
+108107
+101205
+51498
+136829
+140171
+59441
+144489
+139384
+145841
+96771
+116821
+88599
+126780
+65012
+67621
+129699
+149639
+97590
+147527
+117462
+146709
+60527
+107643
+92956
+72177
+92285
+62475
+63099
+66904
+77268
+62945
+134364
+106924
+117842
+130016
+123712
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..688f216
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,69 @@
+use clap::{App,Arg,SubCommand};
+
+fn is_number(s: String) -> Result<(), String> {
+    match u64::from_str_radix(&s, 10) {
+        Ok(_) => Ok(()),
+        Err(e) => Err(e.to_string()),
+    }
+}
+
+fn calculate_base_fuel(mass: u64) -> u64 {
+    let div3 = mass / 3;
+
+    if div3 >= 2 {
+        div3 - 2
+    } else {
+        0
+    }
+}
+
+fn calculate_fuel(mass: u64) -> u64 {
+    let mut res = calculate_base_fuel(mass);
+    let mut last_round = res;
+
+    loop {
+        let new_round = calculate_base_fuel(last_round);
+        if new_round == 0 {
+            return res;
+        } else {
+            res += new_round;
+            last_round = new_round;
+        }
+    }
+}
+
+fn main() {
+    let matches = App::new("My Advent of Code Thing")
+                      .version("1.0")
+                      .author("Adam Wick <awick@uhsure.com>")
+                      .about("Runs advent of code programs")
+                      .subcommand(SubCommand::with_name("fuel")
+                                    .about("runs the fuel computation from day1")
+                                    .arg(Arg::with_name("NUM")
+                                             .help("The mass of the ship")
+                                             .multiple(true)
+                                             .validator(is_number)))
+                      .get_matches();
+
+    if let Some(problem1) = matches.subcommand_matches("fuel") {
+        let mut total = 0;
+
+        match problem1.values_of("NUM") {
+            None =>
+                println!("ERROR: No values to compute fuel for!"),
+            Some(masses) => {
+                for mass_str in masses {
+                    let mass = u64::from_str_radix(&mass_str, 10).unwrap();
+                    let fuel = calculate_fuel(mass);
+                    println!("Mass {}: {} fuel", mass, fuel);
+                    total += fuel;
+                }
+
+                println!("TOTAL FUEL: {}", total);
+                std::process::exit(0);
+            }
+        }
+    }
+
+    println!("Failed to run a reasonable command.");
+}