advent-of-code/2021
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day(04): add solution

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Signed-off-by: Matej Focko <mfocko@redhat.com>
This commit is contained in:
Matej Focko 2021-12-04 14:21:56 +01:00
parent 5b448e201e
commit 5485bf27b7
3 changed files with 747 additions and 0 deletions
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127
src/Day04.kt Normal file
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fun main() {
class Bingo(description: List<String>) {
private val draws: List<Int> = description[0].split(",").map { it.toInt() }
private var nextDraw: Int = 0
private val boards: List<MutableList<MutableList<Int>>> = description.drop(1).chunked(6)
.map { board ->
board.drop(1)
.map { row ->
row
.split(Regex("\\s+"))
.filter { it != "" }
.map { it.toInt() }
.toMutableList()
}
.toMutableList()
}
private var orderOfWin: MutableList<MutableList<MutableList<Int>>> = mutableListOf()
fun mark(board: MutableList<MutableList<Int>>, number: Int) {
for (i in board.indices) {
for (j in board[i].indices) {
if (board[i][j] == number) {
val before = isWinningBoard(board)
board[i][j] = -1
val after = isWinningBoard(board)
if (before != after) {
orderOfWin.add(board)
}
}
}
}
}
fun isWinningBoard(board: MutableList<MutableList<Int>>): Boolean {
for (i in board.indices) {
val inRow = board[i].count { it == -1 }
val inColumn = (board.indices).count { board[it][i] == -1 }
if (inRow == board.size || inColumn == board.size) {
return true
}
}
return false
}
fun winningBoardsCount(): Int {
var counter = 0
for (board in boards) {
if (isWinningBoard(board)) {
counter++
}
}
return counter
}
fun boardsCount(): Int {
return boards.size
}
val hasWinner: Boolean
get() {
for (board in boards) {
if (isWinningBoard(board)) {
return true
}
}
return false
}
fun draw() {
val number = draws[nextDraw++]
for (board in boards) {
mark(board, number)
}
}
fun sumOfUnmarked(): Int {
for (board in boards) {
if (!isWinningBoard(board)) {
continue
}
return board.sumOf { row -> row.filter { it != -1 }.sum() }
}
return -1
}
fun sumOfLast(): Int {
return orderOfWin.last().sumOf { row -> row.filter { it != -1 }.sum() }
}
fun lastDraw(): Int {
check(nextDraw > 0)
return draws[nextDraw - 1]
}
}
fun part1(input: Bingo): Int {
while (!input.hasWinner) {
input.draw()
}
return input.sumOfUnmarked() * input.lastDraw()
}
fun part2(input: Bingo): Int {
while (input.winningBoardsCount() < input.boardsCount()) {
input.draw()
}
return input.sumOfLast() * input.lastDraw()
}
val testInput = Bingo(readInput("Day04_test"))
val input = Bingo(readInput("Day04"))
check(part1(testInput) == 4512)
println(part1(input))
check(part2(testInput) == 1924)
println(part2(input))
}

601
src/Day04.txt Normal file
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57,9,8,30,40,62,24,70,54,73,12,3,71,95,58,88,23,81,53,80,22,45,98,37,18,72,14,20,66,0,19,31,82,34,55,29,27,96,48,28,87,83,36,26,63,21,5,46,33,86,32,56,6,38,52,16,41,74,99,77,13,35,65,4,78,91,90,43,1,2,64,60,94,85,61,84,42,76,68,10,49,89,11,17,79,69,39,50,25,51,47,93,44,92,59,75,7,97,67,15
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7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
22 13 17 11 0
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2 0 12 3 7