62 lines
No EOL
2.4 KiB
Kotlin
Executable file
62 lines
No EOL
2.4 KiB
Kotlin
Executable file
#!/usr/bin/env kotlin
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import java.io.File
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import java.util.LinkedList
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data class Block (
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var type: Type,
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var seen: Boolean = false,
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var distance: Int = Int.MAX_VALUE
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) {
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enum class Type {
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Empty,
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Byte,
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}
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}
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val bytes = File("input.txt").readLines().subList(0, 1024).map { it.split(",").let { s -> s[0].toInt() to s[1].toInt() } }.toSet()
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val grid = (0..70).map { row -> (0..70).map { col ->
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Block(
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type = if (bytes.contains(col to row)) Block.Type.Byte
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else Block.Type.Empty,
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)
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}.toMutableList() }.toMutableList()
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grid[0][0].seen = true
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grid[0][0].distance = 0
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val queue = LinkedList<Pair<Int, Int>>()
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queue.addFirst(0 to 0)
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while (!queue.isEmpty()) {
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// Take one off the queue
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val next = queue.pollLast() ?: break
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// Check if we reached goal
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if (next.first == 70 && next.second == 70) {
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break
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}
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// Add neighbors
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if ((0..70).contains(next.first + 1) && grid[next.first + 1][next.second].let { it.type == Block.Type.Empty && it.distance > grid[next.first][next.second].distance + 1 }) {
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grid[next.first + 1][next.second].seen = true
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grid[next.first + 1][next.second].distance = grid[next.first][next.second].distance + 1
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queue.addFirst(next.first + 1 to next.second)
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}
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if ((0..70).contains(next.second + 1) && grid[next.first][next.second + 1].let { it.type == Block.Type.Empty && it.distance > grid[next.first][next.second].distance + 1 }) {
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grid[next.first][next.second + 1].seen = true
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grid[next.first][next.second + 1].distance = grid[next.first][next.second].distance + 1
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queue.addFirst(next.first to next.second + 1)
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}
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if ((0..70).contains(next.first - 1) && grid[next.first - 1][next.second].let { it.type == Block.Type.Empty && it.distance > grid[next.first][next.second].distance + 1 }) {
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grid[next.first - 1][next.second].seen = true
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grid[next.first - 1][next.second].distance = grid[next.first][next.second].distance + 1
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queue.addFirst(next.first - 1 to next.second)
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}
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if ((0..70).contains(next.second - 1) && grid[next.first][next.second - 1].let { it.type == Block.Type.Empty && it.distance > grid[next.first][next.second].distance + 1 }) {
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grid[next.first][next.second - 1].seen = true
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grid[next.first][next.second - 1].distance = grid[next.first][next.second].distance + 1
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queue.addFirst(next.first to next.second - 1)
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}
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}
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println(grid[70][70].distance) |