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| package me.gergo | ||
|
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||
| import java.io.File | ||
|
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||
| fun main() { | ||
| val elves = File("src/main/resources/input23.txt") | ||
| .readLines() | ||
| .mapIndexed { y, line -> | ||
| line.mapIndexedNotNull { x, c -> if (c == '#') Coordinate(x, y) else null } | ||
| }.flatten() | ||
| .toHashSet() | ||
| val simulateUntil = Int.MAX_VALUE | ||
|
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| val directions = listOf(::canMoveNorth, ::canMoveSouth, ::canMoveWest, ::canMoveEast) | ||
| val moves = listOf(Coordinate::north, Coordinate::south, Coordinate::west, Coordinate::east) | ||
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| val proposals = mutableMapOf<Coordinate, MutableList<Coordinate>>() | ||
| fun propose(target: Coordinate, elf: Coordinate) = proposals.computeIfAbsent(target) { mutableListOf() }.add(elf) | ||
|
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| var standing: Int | ||
| for (i in 0 until simulateUntil) { | ||
|
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||
| // Proposal round | ||
| proposals.clear() | ||
| standing = 0 | ||
| for (elf in elves) { | ||
| val canMove = directions.map { it(elf, elves) } | ||
| if (canMove.all { it }) standing++ // Could move anywhere, so we don't | ||
| else { | ||
| for (d in canMove.indices) { // Trying to move in priority order | ||
| if (canMove[(i + d) % directions.size]) { | ||
| val move = moves[(i + d) % moves.size] | ||
| propose(move(elf), elf) | ||
| break | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (standing == elves.size) { | ||
| println("Elves stopped moving at round ${i + 1}") | ||
| break | ||
| } | ||
|
|
||
| // Move round | ||
| proposals | ||
| .filter { it.value.size == 1 } | ||
| .forEach { (target, proposers) -> | ||
| elves.remove(proposers[0]) | ||
| elves.add(target) | ||
| } | ||
| } | ||
|
|
||
| // Calculating the rectangle | ||
| val minX = elves.minOf { it.x } | ||
| val minY = elves.minOf { it.y } | ||
| val maxX = elves.maxOf { it.x } | ||
| val maxY = elves.maxOf { it.y } | ||
| val result1 = (maxX - minX + 1) * (maxY - minY + 1) - elves.size | ||
| println("Empty ground tiles after round 10: $result1") | ||
| } | ||
|
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||
| private fun Coordinate.north() = Coordinate(x, y - 1) | ||
| private fun Coordinate.south() = Coordinate(x, y + 1) | ||
| private fun Coordinate.west() = Coordinate(x - 1, y) | ||
| private fun Coordinate.east() = Coordinate(x + 1, y) | ||
|
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| private fun canMoveNorth(c: Coordinate, elves: Set<Coordinate>) = !elves.contains(Coordinate(c.x - 1, c.y - 1)) | ||
| && !elves.contains(Coordinate(c.x, c.y - 1)) | ||
| && !elves.contains(Coordinate(c.x + 1, c.y - 1)) | ||
|
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||
| private fun canMoveSouth(c: Coordinate, elves: Set<Coordinate>) = !elves.contains(Coordinate(c.x - 1, c.y + 1)) | ||
| && !elves.contains(Coordinate(c.x, c.y + 1)) | ||
| && !elves.contains(Coordinate(c.x + 1, c.y + 1)) | ||
|
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||
| private fun canMoveEast(c: Coordinate, elves: Set<Coordinate>) = !elves.contains(Coordinate(c.x + 1, c.y - 1)) | ||
| && !elves.contains(Coordinate(c.x + 1, c.y)) | ||
| && !elves.contains(Coordinate(c.x + 1, c.y + 1)) | ||
|
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||
| private fun canMoveWest(c: Coordinate, elves: Set<Coordinate>) = !elves.contains(Coordinate(c.x - 1, c.y - 1)) | ||
| && !elves.contains(Coordinate(c.x - 1, c.y)) | ||
| && !elves.contains(Coordinate(c.x - 1, c.y + 1)) |
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