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main.go
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main.go
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package main
import (
"fmt"
"strings"
"github.com/jdrst/adventofgo/util"
)
type BingoNumber struct {
num int
marked bool
}
type Board [5][5]BingoNumber
func main() {
fmt.Printf("First part: %v\n", partOne(util.ReadFile("input.txt")))
fmt.Printf("Second part: %v\n", partTwo(util.ReadFile("input.txt")))
}
func partOne(file util.File) int {
lines := strings.Split(strings.TrimSpace(string(file)), util.NewLine()+util.NewLine())
nums := util.Line(lines[0]).SubSplitWith(",").AsInts()
boards := createBoardsFrom(lines[1:])
for _, n := range nums {
for j := range boards {
boards[j].MarkNum(n)
if boards[j].HasWon() {
return boards[j].CalculateScore(n)
}
}
}
return 0
}
func partTwo(file util.File) int {
lines := strings.Split(strings.TrimSpace(string(file)), util.NewLine()+util.NewLine())
nums := util.Line(lines[0]).SubSplitWith(",").AsInts()
boards := createBoardsFrom(lines[1:])
var lastWinningScore int
for _, n := range nums {
for j := 0; j < len(boards); j++ {
boards[j].MarkNum(n)
if boards[j].HasWon() {
lastWinningScore = boards[j].CalculateScore(n)
boards = append(boards[:j], boards[j+1:]...)
j--
}
}
}
return lastWinningScore
}
func (b *Board) CalculateScore(winNr int) int {
sum := 0
for _, r := range b {
for _, n := range r {
if !n.marked {
sum += n.num
}
}
}
return sum * winNr
}
func (b *Board) MarkNum(num int) {
for i, r := range b {
for j, n := range r {
if n.num == num {
b[i][j].marked = true
}
}
}
}
func (b Board) HasWon() bool {
nextRow:
for i, r := range b {
for _, n := range r {
if !n.marked {
goto cols
}
}
return true
cols:
for j := 0; j < len(b); j++ {
if !b[j][i].marked {
continue nextRow
}
}
return true
}
return false
}
func createBoardsFrom(a []string) []Board {
boards := make([]Board, len(a))
for i, s := range a {
var b Board
for j, r := range strings.Split(s, util.NewLine()) {
for k, n := range strings.Fields(r) {
b[j][k] = BingoNumber{util.ToInt(n), false}
}
}
boards[i] = b
}
return boards
}