82 lines
1.5 KiB
Go
82 lines
1.5 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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type Game struct {
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id int
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sets []Set
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}
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type Set struct {
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red int
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green int
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blue int
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}
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func parseGame(input string) Game {
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idStr, setsStr, _ := strings.Cut(input, ": ")
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var game Game
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var err error
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game.id, err = strconv.Atoi(strings.TrimPrefix(idStr, "Game "))
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for i, setStr := range strings.Split(setsStr, "; ") {
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game.sets = append(game.sets, Set{})
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for _, colorStr := range strings.Split(setStr, ", ") {
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if strings.HasSuffix(colorStr, " red") {
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game.sets[i].red, err = strconv.Atoi(strings.TrimSuffix(colorStr, " red"))
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}
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if strings.HasSuffix(colorStr, " green") {
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game.sets[i].green, err = strconv.Atoi(strings.TrimSuffix(colorStr, " green"))
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}
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if strings.HasSuffix(colorStr, " blue") {
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game.sets[i].blue, err = strconv.Atoi(strings.TrimSuffix(colorStr, " blue"))
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}
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}
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}
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if err != nil {
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panic("day02: invalid game format")
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}
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return game
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}
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func isGameValid(game Game) bool {
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for _, set := range game.sets {
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if set.red > 12 || set.green > 13 || set.blue > 14 {
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return false
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}
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}
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return true
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}
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func ScanFile(file *os.File) (int, error) {
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scanner := bufio.NewScanner(file)
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sum := 0
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for scanner.Scan() {
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if game := parseGame(scanner.Text()); isGameValid(game) {
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sum += game.id
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}
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}
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if err := scanner.Err(); err != nil {
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return 0, err
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}
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return sum, nil
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}
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func main() {
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sum, err := ScanFile(os.Stdin)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Invalid input: %s\n", err)
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return
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}
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fmt.Println(sum)
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} |