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2024 day 6 part 1

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tristan 2024-12-06 07:13:59 +00:00
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{lib, ...}: input: rec {
content = lib.trim input;
chart = content
|> lib.strings.splitString "\n"
|> map (lib.strings.splitString "")
|> map (line: lib.sublist 1 (builtins.length line - 2) line)
;
startingPos = let
xs = map (lib.lists.findFirstIndex (char: char == "^") null) chart;
y = lib.lists.findFirstIndex (x: !isNull x) null xs;
x = builtins.elemAt xs y;
in
{inherit x y;}
;
posToString = {x, y}: "${toString x},${toString y}";
addVec = a: b: {x = a.x + b.x; y = a.y + b.y;};
index = i: list: builtins.elemAt list i;
getChar = {x, y}: chart
|> index y
|> index x
;
height = builtins.length chart;
width = chart |> index 0 |> builtins.length;
progress = {visited ? {}, pos, dir, ...}: let
nextChar = getChar (addVec pos dir);
newDir = if nextChar == "#" then rotate dir else dir;
newPos = addVec pos newDir;
fwd = addVec pos dir;
in
{
visited = visited // {${posToString pos} = true;};
exited = fwd.y >= height || fwd.x >= width || fwd.y < 0 || fwd.x < 0;
pos = newPos;
dir = newDir;
};
rotate = {x, y}: {x = -y; y = x;};
startingDir = {x = 0; y = -1;};
getVisits = {pos ? startingPos, dir ? startingDir, visited ? {}, ...}:
let
nextStep = progress {inherit pos dir visited;};
in if nextStep.exited then visited else getVisits nextStep;
part1result = getVisits {}
|> builtins.attrNames
|> builtins.length
# the last position
|> (v: v + 1)
;
}