105 lines
1.9 KiB
Go
105 lines
1.9 KiB
Go
package main
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import (
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"fmt"
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"math"
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"strings"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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part1(inp)
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fmt.Println()
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part2(inp)
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}
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func part1(input []string) {
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var total int
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for i := range input {
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total += cardFromLine(input[i]).Value()
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}
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fmt.Println("# Part 1")
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fmt.Println(total)
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}
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func part2(input []string) {
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cards := make(map[int]*Card)
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for i := range input {
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c := cardFromLine(input[i])
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cards[c.id] = c
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}
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result := len(cards)
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for _, card := range cards {
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result += card.TotalCardsWon(cards)
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}
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fmt.Println("# Part 2")
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fmt.Println(result)
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}
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type Card struct {
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id int
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winners []int
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numbers []int
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winsCards []int
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totalCardsWon int
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}
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func (c Card) String() string {
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return fmt.Sprintf("Card %d: %v | %v", c.id, c.winners, c.numbers)
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}
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func cardFromLine(input string) *Card {
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pts := strings.Fields(input)
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ret := Card{id: h.Atoi(pts[1]), totalCardsWon: -1}
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winners := true
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for _, s := range pts[2:] {
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if s == "|" {
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winners = false
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} else {
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if winners {
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ret.winners = append(ret.winners, h.Atoi(s))
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} else {
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ret.numbers = append(ret.numbers, h.Atoi(s))
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}
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}
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}
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for _, w := range ret.winners {
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for _, n := range ret.numbers {
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skip := h.IntSliceContains(ret.winsCards, w)
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if n == w && !skip {
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ret.winsCards = append(ret.winsCards, w)
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}
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if skip {
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break
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}
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}
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}
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return &ret
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}
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func (c *Card) Value() int {
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return int(math.Pow(2, float64(len(c.winsCards)-1)))
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}
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func (c *Card) TotalCardsWon(cm map[int]*Card) int {
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if c.totalCardsWon != -1 {
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return c.totalCardsWon
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}
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result := len(c.winsCards)
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// TODO: It doesn't with cards that match the ID,
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// it wins X cards increasing from the current cards ID
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// where x is the number of winning numbers matched
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for i := 1; i <= len(c.winsCards); i++ {
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if v, ok := cm[c.id+i]; ok {
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result += v.TotalCardsWon(cm)
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}
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}
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c.totalCardsWon = result
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return result
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}
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