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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,187 @@ | ||
| import groovy.time.TimeCategory; | ||
| import groovy.time.TimeDuration; | ||
| import groovy.transform.EqualsAndHashCode; | ||
| import groovy.transform.ToString; | ||
| import groovy.transform.TupleConstructor; | ||
|
|
||
|
|
||
| @EqualsAndHashCode | ||
| @ToString | ||
| @TupleConstructor | ||
| class Pos { | ||
| final int x; | ||
| final int y; | ||
| } | ||
|
|
||
| @EqualsAndHashCode(callSuper = true) | ||
| class Beam extends Pos { | ||
| final int dir; | ||
| Beam(int x, int y, int dir) { | ||
| super(x, y); | ||
| this.dir = dir; | ||
| } | ||
|
|
||
| String toString() { | ||
| return "Beam($x, $y, $dir)" | ||
| } | ||
| } | ||
|
|
||
| class Platform { | ||
| char[] arr; | ||
| int width; | ||
| int height; | ||
|
|
||
| Platform(List<String> input) { | ||
| arr = input.join("").toCharArray(); | ||
| width = input[0].size(); | ||
| height = input.size(); | ||
| } | ||
|
|
||
| def getAt(Pos pos) { | ||
| int arrpos = pos.x + pos.y * width; | ||
| return arr[arrpos]; | ||
| } | ||
|
|
||
| def putAt(Pos pos, char value) { | ||
| int arrpos = pos.x + pos.y * width; | ||
| arr[arrpos] = value; | ||
| } | ||
|
|
||
| def posOf(char c) { | ||
| return arr.findIndexValues { it == c }.collect { | ||
| new Pos(it % width as int, Math.floor(it / width) as int) | ||
| }; | ||
| } | ||
|
|
||
| String toString() { | ||
| def result = ""; | ||
| for (int y = 0; y < height; y++) { | ||
| for (int x = 0; x < width; x++) { | ||
| result += this[new Pos(x, y)]; | ||
| } | ||
| result += "\n"; | ||
| } | ||
| return result; | ||
| } | ||
| } | ||
|
|
||
|
|
||
| def input = new File("input/day16.txt").readLines(); | ||
| def platform = new Platform(input); | ||
| // println(platform); | ||
|
|
||
| Beam[] moveBeam(Platform platform, Beam beam) { | ||
| switch (beam.dir) { | ||
| case 0: | ||
| def np = new Pos(beam.x, beam.y - 1); | ||
| if (np.y < 0) { | ||
| return []; | ||
| } | ||
| if (platform[np] == '.' as char || platform[np] == '|' as char) { | ||
| return [new Beam(np.x, np.y, beam.dir)]; | ||
| } else if (platform[np] == '\\' as char) { | ||
| return [new Beam(np.x, np.y, 3)]; | ||
| } else if (platform[np] == '/' as char) { | ||
| return [new Beam(np.x, np.y, 1)]; | ||
| } else if (platform[np] == '-' as char) { | ||
| return [new Beam(np.x, np.y, 1), new Beam(np.x, np.y, 3)]; | ||
| } else { | ||
| assert false; | ||
| } | ||
| case 1: | ||
| def np = new Pos(beam.x + 1, beam.y); | ||
| if (np.x >= platform.width) { | ||
| return []; | ||
| } | ||
| if (platform[np] == '.' as char || platform[np] == '-' as char) { | ||
| return [new Beam(np.x, np.y, beam.dir)]; | ||
| } else if (platform[np] == '\\' as char) { | ||
| return [new Beam(np.x, np.y, 2)]; | ||
| } else if (platform[np] == '/' as char) { | ||
| return [new Beam(np.x, np.y, 0)]; | ||
| } else if (platform[np] == '|' as char) { | ||
| return [new Beam(np.x, np.y, 0), new Beam(np.x, np.y, 2)]; | ||
| } else { | ||
| assert false; | ||
| } | ||
| case 2: | ||
| def np = new Pos(beam.x, beam.y + 1); | ||
| if (np.y >= platform.height) { | ||
| return []; | ||
| } | ||
| if (platform[np] == '.' as char || platform[np] == '|' as char) { | ||
| return [new Beam(np.x, np.y, beam.dir)]; | ||
| } else if (platform[np] == '\\' as char) { | ||
| return [new Beam(np.x, np.y, 1)]; | ||
| } else if (platform[np] == '/' as char) { | ||
| return [new Beam(np.x, np.y, 3)]; | ||
| } else if (platform[np] == '-' as char) { | ||
| return [new Beam(np.x, np.y, 1), new Beam(np.x, np.y, 3)]; | ||
| } else { | ||
| assert false; | ||
| } | ||
| case 3: | ||
| def np = new Pos(beam.x - 1, beam.y); | ||
| if (np.x < 0) { | ||
| return []; | ||
| } | ||
| if (platform[np] == '.' as char || platform[np] == '-' as char) { | ||
| return [new Beam(np.x, np.y, beam.dir)]; | ||
| } else if (platform[np] == '\\' as char) { | ||
| return [new Beam(np.x, np.y, 0)]; | ||
| } else if (platform[np] == '/' as char) { | ||
| return [new Beam(np.x, np.y, 2)]; | ||
| } else if (platform[np] == '|' as char) { | ||
| return [new Beam(np.x, np.y, 0), new Beam(np.x, np.y, 2)]; | ||
| } else { | ||
| assert false; | ||
| } | ||
| default: | ||
| assert false : "Invalid direction"; | ||
| } | ||
| } | ||
|
|
||
| int energize(Platform platform, Beam start) { | ||
| def beams = [start]; | ||
| def energizedTiles = [:]; | ||
| while (beams.size() > 0) { | ||
| def beam = beams.pop(); | ||
| if (energizedTiles[beam] != null) { | ||
| continue; | ||
| } | ||
| energizedTiles[beam] = 1; | ||
|
|
||
| beams.addAll(moveBeam(platform, beam)); | ||
| } | ||
|
|
||
| return energizedTiles.keySet() | ||
| .findAll { it != start } | ||
| .collectEntries { [new Pos(it.x, it.y), 1] } | ||
| .size(); | ||
| } | ||
|
|
||
| def printElapsedTime(Closure closure) { | ||
| Date start = new Date(); | ||
| closure(); | ||
| Date stop = new Date(); | ||
| println(TimeCategory.minus(stop, start)); | ||
| } | ||
|
|
||
| printElapsedTime { | ||
| println(energize(platform, new Beam(-1, 0, 1))); | ||
| } | ||
|
|
||
| printElapsedTime { | ||
| def max = 0; | ||
| for (int i = 0; i < platform.width; i++) { | ||
| max = Math.max(max, energize(platform, new Beam(i, -1, 2))); | ||
| max = Math.max(max, energize(platform, new Beam(i, platform.height, 0))); | ||
| } | ||
|
|
||
| for (int i = 0; i < platform.height; i++) { | ||
| max = Math.max(max, energize(platform, new Beam(-1, i, 1))); | ||
| max = Math.max(max, energize(platform, new Beam(platform.width, i, 3))); | ||
| } | ||
|
|
||
| println(max); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| \..|.....................|.-........\.............-................|./....|.....-...-......................... | ||
| .......\.........|..............-...||..............-...........--.|...............||..........\............|. | ||
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| ...............\/.............../.|............................/.|...................-............-........... | ||
| .................\.....\........./......../.....\.....|........-..\..........................|................ | ||
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| ......../...|........|..-.-.../..../..........|........|....../....../../...........\.............\....../.... | ||
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| ./......................../................-..........................................-.....--....|........... | ||
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| ...../....|................................-.....................................|./..........|.........\.\\.. | ||
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| |..\.|........../|..\..|\..-...................\.................../.....-/...............|................../ | ||
| ...........|..-..............|........................-..............-...............-.............\.........\ | ||
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| ./........./........-...................................\......-......................................-.....-. | ||
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