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@@ -0,0 +1,90 @@
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "log"
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+ "os"
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+)
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+
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+type round struct {
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+ elf byte
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+ me byte
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+ score int
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+}
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+
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+func fight(elf byte, me byte) int {
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+ if me == 'X' && elf == 'C' {
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+ return 6
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+ } else if me == 'Z' && elf == 'B' {
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+ return 6
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+ } else if me == 'Y' && elf == 'A' {
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+ return 6
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+ }
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+
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+ return 0
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+}
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+
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+func readInput(file *os.File, points map[byte]int) []round {
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+ scanner := bufio.NewScanner(file)
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+ var rounds []round
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+
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+ for scanner.Scan() {
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+ line := scanner.Text()
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+ if line == "" {
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+ continue
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+ }
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+
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+ var elf byte
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+ var me byte
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+ n, err := fmt.Sscanf(line, "%c %c", &elf, &me)
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+ if n != 2 || err != nil {
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+ log.Fatal("Can't parse input")
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+ }
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+
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+ score := 0
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+ if points[elf] == points[me] {
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+ score += 3
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+ } else {
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+ score += fight(elf, me)
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+ }
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+
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+ score += points[me]
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+ rounds = append(rounds, round{elf, me, score})
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+ }
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+
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+ return rounds
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+}
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+
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+func roundsScore(rounds []round) int {
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+ sum := 0
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+ for i := range rounds {
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+ sum += rounds[i].score
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+ }
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+
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+ return sum
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+}
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+
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+func main() {
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+ if len(os.Args) < 2 {
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+ log.Fatal("You need to specify a file!")
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+ }
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+
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+ filePath := os.Args[1]
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+ file, err := os.Open(filePath)
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+ if err != nil {
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+ log.Fatalf("Failed to open %s!\n", filePath)
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+
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+ }
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+
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+ points := make(map[byte]int)
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+ points['A'] = 1
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+ points['X'] = 1
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+ points['B'] = 2
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+ points['Y'] = 2
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+ points['C'] = 3
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+ points['Z'] = 3
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+
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+ rounds := readInput(file, points)
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+ fmt.Println("Part1:", roundsScore(rounds))
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+}
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