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Day 15

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Bas Dado
2019-12-15 17:59:34 +01:00
parent fd597fc181
commit c90804bc0a
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src/main/kotlin/com/basdado/adventofcode/AllDays.kt Normal file
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package com.basdado.adventofcode
import com.basdado.adventofcode.day1.Day1
import com.basdado.adventofcode.day10.Day10
import com.basdado.adventofcode.day11.Day11
import com.basdado.adventofcode.day12.Day12
import com.basdado.adventofcode.day13.Day13
import com.basdado.adventofcode.day14.Day14
import com.basdado.adventofcode.day15.Day15
import com.basdado.adventofcode.day2.Day2
import com.basdado.adventofcode.day3.Day3
import com.basdado.adventofcode.day4.Day4
import com.basdado.adventofcode.day5.Day5
import com.basdado.adventofcode.day6.Day6
import com.basdado.adventofcode.day7.Day7
import com.basdado.adventofcode.day8.Day8
import com.basdado.adventofcode.day9.Day9
fun main() {
Day1.puzzle1()
Day1.puzzle2()
Day2.puzzle1()
Day2.puzzle2()
Day3.puzzle1()
Day3.puzzle2()
Day4.puzzle1()
Day4.puzzle2()
Day5.puzzle1()
Day5.puzzle2()
Day6.puzzle1()
Day6.puzzle2()
Day7.puzzle1()
Day7.puzzle2()
Day8.puzzle1()
Day8.puzzle2()
Day9.puzzle1()
Day9.puzzle2()
Day10.puzzle1()
Day10.puzzle2()
Day11.puzzle1()
Day11.puzzle2()
Day12.puzzle1()
Day12.puzzle2()
Day13.puzzle1()
Day13.puzzle2()
Day14.puzzle1()
Day14.puzzle2()
Day15.puzzle1()
Day15.puzzle2()
}

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src/main/kotlin/com/basdado/adventofcode/day15/Day15.kt Normal file
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package com.basdado.adventofcode.day15
import com.basdado.adventofcode.IntCodeProgram
import com.basdado.adventofcode.StackBasedInputProvider
import com.basdado.adventofcode.day11.Day11
import com.basdado.adventofcode.loadProgramData
const val DAY15_INPUT_PATH = "/day/15/input.txt"
fun main() {
Day15.puzzle1()
Day15.puzzle2()
}
object Day15 {
val movementDirections = mapOf(
// North
Pair(1L, Vector2i(0, 1)),
// South
Pair(2L, Vector2i(0, -1)),
// West
Pair(3L, Vector2i(-1, 0)),
// East
Pair(4L, Vector2i(1, 0))
)
fun puzzle1() {
val programData = loadProgramData(DAY15_INPUT_PATH)
val maze = Maze()
val distances = mutableMapOf(Pair(Vector2i(0, 0), 0))
pathFind(mutableMapOf(Pair(Vector2i(0, 0), programData)), maze, distances)
// maze.print()
val oxygenPosition = maze.find(Cell.OXYGEN)
println(distances[oxygenPosition])
}
fun puzzle2() {
val programData = loadProgramData(DAY15_INPUT_PATH)
val maze = Maze()
val distances = mutableMapOf(Pair(Vector2i(0, 0), 0))
pathFind(mutableMapOf(Pair(Vector2i(0, 0), programData)), maze, distances)
val oxygenPosition = maze.find(Cell.OXYGEN)
val oxygenDistances = mutableMapOf(Pair(oxygenPosition, 0))
floodFill(oxygenPosition, maze, oxygenDistances)
println(oxygenDistances.values.max())
}
fun pathFind(unexplored: MutableMap<Vector2i, LongArray>, maze: Maze, distances: MutableMap<Vector2i, Int>) {
while (unexplored.isNotEmpty()) {
val state = unexplored.minBy { distances[it.key] ?: Int.MAX_VALUE }!!
unexplored.remove(state.key)
// println("Exploring ${state.key}")
for (direction in movementDirections.entries) {
val target = state.key + direction.value
if (maze[target] == null) {
// Move there, find out
val program = IntCodeProgram(state.value.copyOf(), StackBasedInputProvider(longArrayOf(direction.key)))
when (program.executeUntilOutput()!!) {
// Hit a wall
0L -> maze[target] = Cell.WALL
1L -> {
maze[target] = Cell.EMPTY
}
2L -> {
maze[target] = Cell.OXYGEN
}
}
distances[target] = distances[state.key]!! + 1
if (maze[target] != Cell.WALL) {
unexplored[target] = program.data
}
} else {
// Check if this path was faster than the existing one
if (distances[target]!! > distances[state.key]!! + 1) {
error("Found a target that was visited using a longer route? this shouldn't happen...")
}
}
}
}
}
fun floodFill(pos: Vector2i, maze: Maze, distances: MutableMap<Vector2i, Int>) {
val distanceToPos = distances[pos]!!
for (direction in movementDirections.values) {
val target = pos + direction
if (maze[target] != null && maze[target] != Cell.WALL) {
val targetDistance = distances[target]
if (targetDistance == null || targetDistance > distanceToPos + 1) {
distances[target] = distanceToPos + 1
floodFill(target, maze, distances)
}
}
}
}
class Maze {
private val data = mutableMapOf(Pair(Vector2i(0, 0), Cell.EMPTY))
operator fun get(pos: Vector2i): Cell? = data[pos]
operator fun set(pos: Vector2i, cell: Cell) {
data[pos] = cell
}
fun print() {
val min = Vector2i(
data.keys.map { it.x }.min()!!,
data.keys.map { it.y }.min()!!
)
val max = Vector2i(
data.keys.map { it.x }.max()!!,
data.keys.map { it.y }.max()!!
)
for(y in (min.y..max.y)) {
for (x in (min.x..max.x)) {
if (x == 0 && y == 0) print("O") else {
print(
when (data[Vector2i(x, y)]) {
null -> " "
Cell.EMPTY -> "."
Cell.WALL -> "#"
Cell.OXYGEN -> "o"
}
)
}
}
println()
}
}
fun find(cell: Day15.Cell): Vector2i {
return data.entries.first { it.value == cell }.key
}
}
enum class Cell {
EMPTY, WALL, OXYGEN
}
data class Vector2i(val x: Int, val y: Int) {
operator fun div(d: Int) = Vector2i(x / d, y / d)
operator fun minus(n: Int) = Vector2i(x - n, y - n)
operator fun minus(v: Vector2i) = Vector2i(x - v.x, y - v.y)
operator fun plus(n: Int) = Vector2i(x + n, y + n)
operator fun plus(v: Vector2i) = Vector2i(x + v.x, y + v.y)
}
}

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src/main/resources/day/15/input.txt Normal file
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3,1033,1008,1033,1,1032,1005,1032,31,1008,1033,2,1032,1005,1032,58,1008,1033,3,1032,1005,1032,81,1008,1033,4,1032,1005,1032,104,99,1001,1034,0,1039,1001,1036,0,1041,1001,1035,-1,1040,1008,1038,0,1043,102,-1,1043,1032,1,1037,1032,1042,1105,1,124,102,1,1034,1039,1002,1036,1,1041,1001,1035,1,1040,1008,1038,0,1043,1,1037,1038,1042,1106,0,124,1001,1034,-1,1039,1008,1036,0,1041,1002,1035,1,1040,1001,1038,0,1043,1002,1037,1,1042,1106,0,124,1001,1034,1,1039,1008,1036,0,1041,1002,1035,1,1040,101,0,1038,1043,1001,1037,0,1042,1006,1039,217,1006,1040,217,1008,1039,40,1032,1005,1032,217,1008,1040,40,1032,1005,1032,217,1008,1039,35,1032,1006,1032,165,1008,1040,35,1032,1006,1032,165,1102,1,2,1044,1105,1,224,2,1041,1043,1032,1006,1032,179,1102,1,1,1044,1105,1,224,1,1041,1043,1032,1006,1032,217,1,1042,1043,1032,1001,1032,-1,1032,1002,1032,39,1032,1,1032,1039,1032,101,-1,1032,1032,101,252,1032,211,1007,0,44,1044,1106,0,224,1102,0,1,1044,1106,0,224,1006,1044,247,1001,1039,0,1034,1002,1040,1,1035,102,1,1041,1036,101,0,1043,1038,1001,1042,0,1037,4,1044,1106,0,0,9,21,23,46,38,21,77,24,34,41,9,82,3,32,97,21,67,23,67,35,41,27,93,13,82,38,74,16,91,25,34,64,47,43,50,15,81,21,30,27,63,88,9,98,95,42,69,23,57,15,52,22,65,43,7,36,90,13,8,83,68,37,6,48,22,53,21,87,86,77,23,14,56,40,32,77,15,9,70,2,28,88,35,37,98,91,29,84,4,62,75,99,40,57,68,35,79,47,78,41,88,20,92,24,76,8,8,51,16,21,75,97,15,71,34,21,77,26,5,98,92,13,94,36,39,61,78,19,96,12,28,3,68,17,8,83,29,50,10,17,46,9,18,56,2,75,53,47,12,66,18,62,67,10,73,35,69,33,58,39,24,68,17,90,77,35,83,22,98,46,6,46,41,45,69,33,12,70,21,47,13,25,54,36,53,23,83,6,31,33,79,55,29,55,42,9,53,25,29,66,60,83,37,9,56,35,2,28,50,84,92,1,50,40,1,59,93,5,85,82,31,74,34,70,28,37,51,50,31,24,83,62,36,29,16,9,93,49,40,13,50,51,54,23,66,88,46,15,31,90,10,59,38,87,36,32,54,71,35,6,24,43,76,53,17,60,41,64,66,12,5,84,22,47,24,94,39,40,51,20,33,61,35,10,9,97,8,79,56,19,59,41,91,67,9,12,70,55,78,78,31,25,45,3,62,10,87,20,17,54,66,14,28,58,3,12,94,80,4,93,93,18,70,92,7,43,30,99,21,81,68,23,19,75,49,42,37,72,14,17,16,50,77,12,33,92,84,26,83,35,52,32,53,5,49,3,94,72,39,51,41,64,4,99,77,67,30,60,52,4,1,75,96,10,12,54,58,4,66,62,84,38,2,46,83,12,33,99,17,3,42,64,84,38,62,6,72,42,20,82,30,36,63,27,75,11,65,16,36,79,9,58,33,48,56,20,11,13,41,65,28,99,15,31,56,89,26,58,5,13,93,24,11,4,25,49,83,96,15,93,60,2,8,86,76,10,41,60,53,13,45,70,33,35,88,38,76,75,26,88,73,52,19,32,88,17,65,35,23,3,74,93,40,77,19,10,57,1,53,12,84,32,39,96,16,55,38,77,52,24,1,58,5,90,88,33,78,36,16,61,22,36,76,64,23,38,56,18,67,32,86,53,21,76,52,34,57,4,19,1,74,67,9,61,80,9,35,31,80,12,97,28,41,72,24,38,64,25,87,21,54,15,84,55,9,33,16,52,51,37,79,43,54,20,98,33,45,89,18,25,33,9,12,52,27,67,62,92,27,95,35,47,13,52,22,63,51,19,50,50,40,19,90,13,67,49,18,83,6,58,9,62,16,74,20,16,51,56,90,36,50,3,48,26,50,31,24,74,83,73,10,55,90,83,4,1,46,21,88,26,56,35,10,77,2,40,90,14,68,27,62,38,6,61,66,10,8,72,35,79,74,38,76,46,43,83,25,25,75,11,18,74,18,3,59,94,22,42,79,85,9,10,26,78,27,13,94,28,57,25,19,59,1,89,54,84,41,9,71,6,30,73,29,58,87,43,61,17,66,9,69,23,58,36,11,45,86,45,28,62,97,6,31,19,99,65,36,58,36,45,3,26,27,33,46,75,19,97,24,65,75,33,15,21,83,98,38,29,77,83,15,62,7,51,86,12,11,37,7,86,9,80,37,92,28,50,52,69,16,55,76,59,9,85,30,97,69,93,13,63,4,74,80,88,31,80,36,51,40,98,95,83,23,92,7,91,63,68,40,73,0,0,21,21,1,10,1,0,0,0,0,0,0