2022 day 1

Author: pvainio

2022/go/day1/day1.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+)
+
+func main() {
+	elfs := readElfs("../../input/day1.txt")
+
+	sort.Sort(sort.Reverse(sort.IntSlice(elfs)))
+
+	fmt.Printf("part 1: %v\n", elfs[0])
+
+	sum := 0
+	for _, c := range elfs[0:3] {
+		sum += c
+	}
+
+	fmt.Printf("part 2: %v\n", sum)
+}
+
+func readElfs(name string) []int {
+	elfs := []int{0}
+	currentElf := &elfs[0]
+
+	fileByLine(name, func(line string) {
+		if line == "" {
+			elfs = append(elfs, 0)
+			currentElf = &elfs[len(elfs)-1]
+		} else {
+			cals, _ := strconv.Atoi(line)
+			*currentElf += cals
+		}
+	})
+	return elfs
+}
+
+func fileByLine(name string, handler func(line string)) {
+	file, err := os.Open(name)
+	if err != nil {
+		panic(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		handler(scanner.Text())
+	}
+}

2022/go/go.mod

@@ -0,0 +1,3 @@
+module aoc2022
+
+go 1.19