96 lines
1.9 KiB
Go
96 lines
1.9 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"math"
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"os"
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"regexp"
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"strconv"
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"strings"
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)
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var (
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inputFile = flag.String("input", "input.txt", "input filename")
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subsetRegex = regexp.MustCompile(`(?mi)(\d+)+\s(\w+)([,;]?)`)
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startRegex = regexp.MustCompile(`(?mi)Game\s(\d+):`)
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)
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const (
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BlueCube = "blue"
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GreenCube = "green"
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RedCube = "red"
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MaxRed = 12
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MaxGreen = 13
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MaxBlue = 14
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)
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func main() {
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flag.Parse()
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input, err := os.ReadFile(*inputFile)
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if err != nil {
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panic(err)
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}
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var sum, powSum int
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for _, line := range strings.Split(string(input), "\n") {
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if strings.TrimSpace(line) == "" {
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continue
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}
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// find id
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idMatch := startRegex.FindAllStringSubmatch(line, -1)
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id, err := strconv.Atoi(idMatch[0][1])
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if err != nil {
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panic(err)
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}
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// find sets of digit + color + separator (e.g. "3 blue,")
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subsets := subsetRegex.FindAllStringSubmatch(line, -1)
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var red, green, blue int
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var minRed, minGreen, minBlue int
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possible := true
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for _, subset := range subsets {
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cubeAmount, err := strconv.Atoi(subset[1])
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if err != nil {
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panic(err)
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}
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// add cube amount to set
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switch strings.ToLower(subset[2]) {
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case BlueCube:
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blue += cubeAmount
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case GreenCube:
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green += cubeAmount
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case RedCube:
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red += cubeAmount
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}
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// end of set reached
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if subset[3] == "" || subset[3] == ";" {
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if red > MaxRed || green > MaxGreen || blue > MaxBlue {
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possible = false
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}
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minBlue = int(math.Max(float64(minBlue), float64(blue)))
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minRed = int(math.Max(float64(minRed), float64(red)))
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minGreen = int(math.Max(float64(minGreen), float64(green)))
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red = 0
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blue = 0
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green = 0
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}
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}
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// end of game reached
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powSum += minRed * minGreen * minBlue
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if possible {
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fmt.Printf("%d possible\n", id)
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sum += id
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}
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}
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fmt.Printf("Sum of IDs: %d\n", sum)
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fmt.Printf("Sum of the power of sets: %d", powSum)
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}
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