🌅

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])
+}