aoc2023/day-2/two.go

package main

import (
	"strconv"
	"strings"
)

// powerForGame returns the power of the minimum set of cubes for a game
func powerForGame(data string) (int, error) {
	var counter = map[string]int{
		"red":   0,
		"green": 0,
		"blue":  0,
	}

	for _, colour := range []string{"red", "green", "blue"} {
		m := regex[colour].FindAllStringSubmatch(data, -1)
		for _, s := range m {
			n, err := strconv.Atoi(s[1])
			if err != nil {
				return 0, err
			}
			if counter[colour] == 0 {
				counter[colour] = n
			} else if counter[colour] < n {
				counter[colour] = n
			}
		}
	}
	return counter["red"] * counter["green"] * counter["blue"], nil
}

// two returns the sum of powers for all games
func two(lines []string) (int, error) {
	sum := 0

	for _, line := range lines {
		_, data := func() (string, string) {
			x := strings.Split(line, ":")
			return x[0], x[1]
		}()

		pow, err := powerForGame(data)
		if err != nil {
			return 0, err
		}
		sum += pow
	}

	return sum, nil
}