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package part_01
import (
"os"
"regexp"
"strconv"
"strings"
)
type cubes struct {
red int
blue int
green int
}
func Solve() {
contents, err := os.ReadFile("../_input/day_02.txt")
if err != nil {
panic(err)
}
lines := strings.Split(string(contents), "\n")
possibleGameIds := processLines(lines)
println(accumulate(possibleGameIds))
}
func processLines(lines []string) []int {
var possibleGames []int
maxCubes := cubes{red: 12, blue: 14, green: 13}
for _, line := range lines {
if line == "" || line == "\n" {
continue
}
shownCubes := convertLineToCubes(line)
isPossible := isPossibleGame(shownCubes, maxCubes)
if isPossible {
gameId := getGameId(line)
possibleGames = append(possibleGames, gameId)
}
}
return possibleGames
}
func convertLineToCubes(line string) []cubes {
var shownCubes []cubes
redRegex := regexp.MustCompile(`(\d+) red`)
blueRegex := regexp.MustCompile(`(\d+) blue`)
greenRegex := regexp.MustCompile(`(\d+) green`)
for _, round := range strings.Split(line, ";") {
var cubes cubes
redMatches := redRegex.FindStringSubmatch(round)
if redMatches != nil {
red, err := strconv.Atoi(redMatches[1])
if err != nil {
panic("Could not convert red to int: " + redMatches[1])
} else {
cubes.red = red
}
}
blueMatches := blueRegex.FindStringSubmatch(round)
if blueMatches != nil {
blue, err := strconv.Atoi(blueMatches[1])
if err != nil {
panic("Could not convert green to int: " + blueMatches[1])
} else {
cubes.blue = blue
}
}
greenMatches := greenRegex.FindStringSubmatch(round)
if greenMatches != nil {
green, err := strconv.Atoi(greenMatches[1])
if err != nil {
panic("Could not convert green to int: " + greenMatches[1])
} else {
cubes.green = green
}
}
shownCubes = append(shownCubes, cubes)
}
return shownCubes
}
func isPossibleGame(shownCubes []cubes, maxCubes cubes) bool {
for _, cubes := range shownCubes {
if cubes.red > maxCubes.red {
return false
}
if cubes.blue > maxCubes.blue {
return false
}
if cubes.green > maxCubes.green {
return false
}
}
return true
}
func getGameId(line string) int {
regex := regexp.MustCompile(`^Game (\d+):`)
matches := regex.FindStringSubmatch(line)
if matches == nil || len(matches) < 2 {
println(matches)
panic("No game id found in line: '" + line + "'")
}
gameId, err := strconv.Atoi(matches[1])
if err != nil {
panic("Could not convert game id to int: " + matches[1])
}
return gameId
}
func accumulate(gameIds []int) int {
var acc int
for _, gameId := range gameIds {
acc += gameId
}
return acc
}
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