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[2024/8] Resonant Collinearity (Part 1)
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src/main/kotlin/adventofcode/year2024/Day08ResonantCollinearity.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| package adventofcode.year2024 | ||
|
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||
| import adventofcode.Puzzle | ||
| import adventofcode.PuzzleInput | ||
| import adventofcode.common.Tuple.minus | ||
| import adventofcode.common.Tuple.plus | ||
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| class Day08ResonantCollinearity(customInput: PuzzleInput? = null) : Puzzle(customInput) { | ||
| private val gridSize by lazy { input.lines().size } | ||
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| override fun partOne() = | ||
| input | ||
| .lines() | ||
| .flatMapIndexed { y, row -> row.mapIndexed { x, char -> (x to y) to char } } | ||
| .filterNot { (_, char) -> char == '.' } | ||
| .groupBy({ it.second }, { it.first }) | ||
| .map { (char, antennas) -> | ||
| char to antennas.flatMap { a -> antennas.mapNotNull { b -> if (a != b) setOf(a, b) else null } }.toSet() | ||
| } | ||
| .map { (char, antennaPairs) -> | ||
| char to | ||
| antennaPairs.map { pair -> | ||
| val distance = pair.last() - pair.first() | ||
| setOf(pair.first() - distance, pair.last() + distance).filter { it.isInBounds((gridSize)) } | ||
| } | ||
| } | ||
| .map { (_, antinodes) -> antinodes.flatten() } | ||
| .reduce { allAntinodes, antinodes -> allAntinodes + antinodes } | ||
| .toSet() | ||
| .size | ||
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| companion object { | ||
| fun Pair<Int, Int>.isInBounds(gridSize: Int) = toList().all { it in 0 until gridSize } | ||
| } | ||
| } |
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| .............4....O..........w....R............... | ||
| .................................f................ | ||
| ..............4...j......NW0...................... | ||
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| .....9L............l...N.........w................ | ||
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| ..........................V...l................... | ||
| ..........4....................................... | ||
| .....................j...................3.....U.. | ||
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| 2.............................J............3...... | ||
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| .....s...R...........J..................F......... | ||
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| .......2.....Q........3........x.................. | ||
| ...........v......................u............... | ||
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| .......f..................8........i.............. | ||
| .5..................1n..............P.....i....... | ||
| ............7............Q..................X..... | ||
| ......5...p....................V.................. | ||
| .................J..........nx............q....... | ||
| .......p............W...........................0. | ||
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| ............s.....r...w................V.......... | ||
| ...............or...6.................V........... | ||
| ............................PS.7.................. | ||
| ..........o...........................S........... | ||
| ...........5..............o..1.......n............ | ||
| ...........I.........r.......7.......6............ | ||
| .................o.r...........X.................. | ||
| ................................x.........u....... | ||
| .........p..Q....2................................ | ||
| .........v.................S.....................u | ||
| I...........................S.....6............... | ||
| .................................................. | ||
| .......I.......................................... | ||
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| .......................................6.......... | ||
| .................................X................ |
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src/test/kotlin/adventofcode/year2024/Day08ResonantCollinearitySpec.kt
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| Original file line number | Diff line number | Diff line change |
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| package adventofcode.year2024 | ||
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| import adventofcode.PuzzleBaseSpec | ||
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| class Day08ResonantCollinearitySpec : PuzzleBaseSpec(14) |
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| ............ | ||
| ........0... | ||
| .....0...... | ||
| .......0.... | ||
| ....0....... | ||
| ......A..... | ||
| ............ | ||
| ............ | ||
| ........A... | ||
| .........A.. | ||
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| ............ |