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December 4, 2022 15:29
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a Go solution for AoC day 2 question
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package main | |
import ( | |
"fmt" | |
"os" | |
"strings" | |
) | |
func check(e error) { | |
if e != nil { | |
panic(e) | |
} | |
} | |
const WINNING_POINTS = 6 | |
const TIE_POINTS = 3 | |
func main() { | |
data, err := os.ReadFile("./input.txt") | |
check(err) | |
fmt.Println("Part 1") | |
fmt.Println(part1(data)) | |
fmt.Println("Part 2") | |
fmt.Println(part2(data)) | |
} | |
func part1(raw []byte) int { | |
pairs := parse(string(raw)) | |
// X Rock, Y Paper, Z Scissors | |
scores := map[string]int{ | |
"X": 1, | |
"Y": 2, | |
"Z": 3, | |
} | |
win := map[string]string{ | |
"X": "C", | |
"Y": "A", | |
"Z": "B", | |
} | |
tie := map[string]string{ | |
"X": "A", | |
"Y": "B", | |
"Z": "C", | |
} | |
score := 0 | |
for _, pair := range pairs { | |
his := pair[0] | |
my := pair[1] | |
score += scores[my] | |
if win[my] == his { | |
score += WINNING_POINTS | |
} | |
if tie[my] == his { | |
score += TIE_POINTS | |
} | |
} | |
return score | |
} | |
func part2(raw []byte) int { | |
var pairs = parse(string(raw)) | |
// X Lose, Y Tie, Z Win | |
scores := map[string]int{ | |
"X": 1, | |
"Y": 2, | |
"Z": 3, | |
} | |
win := map[string]string{ | |
"C": "X", | |
"A": "Y", | |
"B": "Z", | |
} | |
tie := map[string]string{ | |
"A": "X", | |
"B": "Y", | |
"C": "Z", | |
} | |
lose := map[string]string{ | |
"A": "Z", | |
"B": "X", | |
"C": "Y", | |
} | |
score := 0 | |
for _, pair := range pairs { | |
hisMove := pair[0] | |
myMove := pair[1] | |
// we lose | |
if myMove == "X" { | |
score += scores[lose[hisMove]] | |
} | |
// we end in a tie | |
if myMove == "Y" { | |
score += TIE_POINTS | |
score += scores[tie[hisMove]] | |
} | |
// we win | |
if myMove == "Z" { | |
score += WINNING_POINTS | |
score += scores[win[hisMove]] | |
} | |
} | |
return score | |
} | |
func parse(raw string) [][]string { | |
chunks := strings.Split(string(raw), "\n") | |
pairs := make([][]string, len(chunks)) | |
for i := range pairs { | |
pairs[i] = strings.Split(chunks[i], " ") | |
} | |
return pairs | |
} |
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