2024 day 6 part 2 (but very slow)
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2024/06/annotated.txt
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2024/06/annotated.txt
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..........#.............................#...............#...........#....................#...........#............................
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..............................#.......#...#.....#.....#...............#.#..#.......................#............#.................
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.............#...........#.#........#............#..........................#.........#.......#......#............................
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......................................................#....#..#.............#................................#...#............##..
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...............#.....#....................................#.................O.OOO...OOO.OO.........O..OO.........#................
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..................##............#......#..................O.O.......O..OOO...O.OO...OO..OO.........O...#...................#......
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.#......#...........OO..OOO...O......O...O.OOO..O.OO..OO....O.......#............................#................................
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#..#.............#...............................#.....#....#.............................#....#..............................#...
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#...##..........#.........................#.................................................#............#...............#........
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..............#...................#......##...#.....#.....O..............#..O...............O....................................#
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......#...........O.......#..........#...................O..O..........O.O..O...O#....#.....O.....................................
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.............................................O.#...#....##.................................................#.....#................
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............#.....O.....##.........O.....O...O.....O................O.............................#......................#........
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....................................................................O.OO.......O.....#...............#......O....#..........#.....
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..............O...O.#..........#................................#...............................................#.................
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....#....#..O.....O.....................O...................O......O..O..................#...#...........#............#...#...#...
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........................................O.....O..O.....##................O.....#O..#................................#.............
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.......#..........O##.....................O.O...#....O......O..#...O..O.......................#...................#......#........
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......#.........#.O.................................................O..O.......#........#..#..........#.....O.#..#...#.....#....#.
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....#.............O..............................O#........#....#..................................#..............................
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..........#.O.O..#O..........#...................O...O............#..............#.......#...#............#.O..O..................
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............O................O..O............OOO...O..O....O........O..O.OO....O.....O.O..O#....O..#..............................
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.#................O.................................#O.............O..O...........#..................#......O..O.........#........
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......#..#.#......O.........#...........O.....O..O#..O..........................O....#.............#...............#..............
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...................O....O...O..#........O...O....O#..O.....#.......O..O.....................................O..O..................
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......................#.............................................O.OO.O.....O....OO....O.O.OO......O..#..O..O...#..............
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...............................................................................................................................#..
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.......#.O........O...#............................................O..O...........#......................#.......................#
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#........O........O.............#...........O..................#...O..O#..........O..O......O.........#...#...#........#..........
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............................#....#...#.........#....#.....OOO.O..OO.OO.O.OO.O...OO......O.O.....O....................#............
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.........OO.O.O...O..#...........O.............O.....OO....O....O...O.OOO.O....O..O..O.#..#....#............O.....#...............
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.........OO.O.O...O...#.......O.....#............O................#.OOOO..O......OO..........O...O.O.....O...O........#...........
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....#.............O...#.#.........##O...OOO.OOOOOOO.#.....#...........O..O......O.....O.........O...........O..#.............#....
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..............................O#...#....O.....O..O.....#........O...O.OOOO.....O.....O......O.O#O.....#.O...O.....................
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....#..............................................O..............................................................................
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...#...............O..OOO...O.OO.O.OO..O.OOOOOOOOOOOOOOOOOO.OO.OO.OOO.OOOOOO.OOOOO..OOOOO.O.OOOOOO..O.OO.OO#O...........#.......#.
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..#.O....OO.O.O.##OOOO.OOOOO..O....................O...........................#...#........................O...#............#....
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....................#O..........#...O..........O................O...O.OOOO.....OO....O..O.#......#.......#O.O........#.....##.....
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......................#.........#................O.O#......#...........................................#..........................
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....O#.O.O....O....O..OOO......O..O#O...#.....O..O.O.......................#...................#...#......O.O....#................
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..............O....#...#...........#O..............O........#.............#........................#...#O.O.O........#..........#.
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...#O..O.OO...O#O.....#O....O.#...O.O........#....OO#.....O....#.....#O......O..OO....O...O..O.OO..O....O.........................
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........#...................O.O..O..O#.#..........O.......O.#...#...#......#.....#O.......................O.O....................#
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......................#......O....O.O....#...#...O.O.......#................##................#.......#...O.O.....#.O.......#.....
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#.....................O.O..O.....OOO...#.#.....O^O.O........O...................O.....O..O......#..O.O....O.O.......O.............
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......OO#O..OO.O.O..O..OO..O.O..OOO.O.OO.O.OOOOO.O.O....O...........#....O......O...#.O..O...........O....O.O.......O.............
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@ -2,10 +2,11 @@
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content = lib.trim input;
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chart = content
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chart = toChart content;
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toChart = s: s
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|> lib.strings.splitString "\n"
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|> map (lib.strings.splitString "")
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|> map (line: lib.sublist 1 (builtins.length line - 2) line)
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|> map (lib.stringToCharacters)
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;
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startingPos = let
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@ -22,7 +23,7 @@
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index = i: list: builtins.elemAt list i;
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getChar = {x, y}: chart
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getChar = {x, y}: chart: chart
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|> index y
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|> index x
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;
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@ -30,33 +31,101 @@
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height = builtins.length chart;
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width = chart |> index 0 |> builtins.length;
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progress = {visited ? {}, pos, dir, ...}: let
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nextChar = getChar (addVec pos dir);
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newDir = if nextChar == "#" then rotate dir else dir;
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replace2d = {x, y}: updated: chart: let
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newRow = chart |> index y |> replace x updated;
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in
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replace y newRow chart;
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replace = i: updated: list:
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let before = lib.sublist 0 i list;
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after = lib.sublist (i + 1) (builtins.length list - i) list;
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in
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if i < 0 || i > builtins.length list then list else
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before ++ [updated] ++ after;
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progress = {visited ? {}, pos, dir, obs ? [], charts ? chart, ...}: let
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newDir = if colliding then rotate dir else dir;
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newPos = addVec pos newDir;
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colliding = nextChar == "#";
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nextChar = getChar fwd charts;
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fwd = addVec pos dir;
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hash = posToString pos;
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exited = fwd.y >= height || fwd.x >= width || fwd.y < 0 || fwd.x < 0;
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canObstruct =
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# unique
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(!lib.elem (posToString fwd) obs)
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# inside map
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&& (!exited)
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# can't put an obstacle when there already is one
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&& (!colliding)
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# if I already visited the place in front, putting an obstacle there won't work, as I can't get to where I am now!
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&& (!lib.hasAttr (posToString fwd) visited)
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# see if I will end up in a loop turning right here
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&& getLoop {inherit pos visited dir; charts = replace2d fwd "#" charts;};
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in
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{
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visited = visited // {${posToString pos} = true;};
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exited = fwd.y >= height || fwd.x >= width || fwd.y < 0 || fwd.x < 0;
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pos = newPos;
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visited = visited // {${hash} = visited.${hash} or [] ++ [dir];};
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pos = if colliding then pos else newPos;
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dir = newDir;
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inherit exited charts;
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obs = obs ++ (if canObstruct then [(posToString fwd)] else []);
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};
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rotate = {x, y}: {x = -y; y = x;};
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startingDir = {x = 0; y = -1;};
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getVisits = {pos ? startingPos, dir ? startingDir, visited ? {}, ...}:
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getVisits = {pos ? startingPos
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, dir ? startingDir
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, visited ? {}
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, obs ? []
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, charts ? chart
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, ...}:
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let
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nextStep = progress {inherit pos dir visited;};
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in if nextStep.exited then visited else getVisits nextStep;
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nextStep = progress {inherit pos dir visited obs charts;};
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in if nextStep.exited then nextStep else getVisits nextStep;
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part1result = getVisits {}
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path = getVisits {};
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part1result = path.visited
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|> builtins.attrNames
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|> builtins.length
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# the last position
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|> (v: v + 1)
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;
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getLoop = state:
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let
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nextStep = progress state;
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hash = posToString state.pos;
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enteredLoop = lib.elem state.dir (state.visited.${hash} or []);
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in if enteredLoop then true
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else if nextStep.exited then false
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else getLoop nextStep;
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part2result = builtins.trace "This is very slow!" (path.obs |> builtins.length)
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;
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# visualisation stuff
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hashToVec = s: s |> lib.splitString "," |> map lib.strings.toInt |> (v: {x = index 0 v; y = index 1 v;});
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annotateObs = chart:
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builtins.foldl'
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(c: obs: let pos = hashToVec obs; in replace2d pos "O" c) chart path.obs;
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annotatePath = chart:
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builtins.foldl'
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(c: hash: let
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pos = hashToVec hash;
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||||
dir = index 0 path.visited.${hash};
|
||||
sym = if dir.x == 1 then ">" else if dir.x == -1 then "<" else if dir.y == 1 then "v" else "^";
|
||||
in replace2d pos sym c) chart
|
||||
(builtins.attrNames path.visited);
|
||||
|
||||
chartToStr = c: c
|
||||
|> map (lib.concatStringsSep "")
|
||||
|> lib.concatStringsSep "\n"
|
||||
;
|
||||
|
||||
annotated = chart |> annotatePath |> annotateObs |> chartToStr;
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -15,8 +15,19 @@
|
|||
example = (pkgs.lib.readFile ./06/example.txt);
|
||||
input = (pkgs.lib.readFile ./06/input.txt);
|
||||
in {
|
||||
part1example = (solution example);
|
||||
part1 = (solution input);
|
||||
example = (solution example);
|
||||
sample1 = (solution ''
|
||||
.#..
|
||||
.^#.
|
||||
.#..'');
|
||||
sample2 = (solution ''
|
||||
.#......
|
||||
........
|
||||
.....#..
|
||||
#.......
|
||||
..#.#...
|
||||
...^....'');
|
||||
real = (solution input);
|
||||
};
|
||||
|
||||
packages.x86_64-linux.watch = tix.watch {
|
||||
|
|
|
|||
4745
2024/results.nix
Normal file
4745
2024/results.nix
Normal file
File diff suppressed because it is too large
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Reference in a new issue