main.go

package main

import (
	"github.com/danvolchek/AdventOfCode/lib"
	"strings"
)

type card struct {
	winners, yours lib.Set[int]
}

func parse(line string) card {
	winners, yours, _ := strings.Cut(line, "|")
	return card{
		winners: lib.NewSet(lib.Ints(winners)[1:]),
		yours:   lib.NewSet(lib.Ints(yours)),
	}
}

func solve(card card) int {
	value := 0

	for _, yours := range card.yours.Items() {
		if card.winners.Contains(yours) {
			switch value {
			case 0:
				value = 1
			default:
				value *= 2
			}
		}
	}

	return value
}

func main() {
	solver := lib.Solver[[]card, int]{
		ParseF: lib.ParseLine(parse),
		SolveF: lib.SolveSum(solve),
	}

	solver.Expect("Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53\nCard 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19\nCard 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1\nCard 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83\nCard 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36\nCard 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11", 13)
	solver.Verify(28538)
}