49 lines
1.4 KiB
TypeScript
49 lines
1.4 KiB
TypeScript
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const input = await Deno.readTextFile("input.txt");
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const initMap = input.split("\n").map(x => x.trim())
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.filter(x => x.length > 0)
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.map(x => x.split(""));
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function map2d<T, S>(map: T[][], fn: (ch: T, x: number, y: number) => S): S[][] {
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return map.map((line, y) => line.map((ch, x) => fn(ch, x, y)));
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}
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function mapToString(map: string[][]) {
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return map.map(x => x.join("")).join("\n");
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}
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let map = map2d(initMap, (ch, x, y) => {
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return ch === "S" ? "O" : ch;
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});
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for (let step = 0; step < 64; step++) {
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// copy map
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const nextMap = map2d(map, (ch) => { return ch; });
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// propagate O
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map2d(map, (ch, x, y) => {
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if (ch === "O") {
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nextMap[y][x] = ".";
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if (x > 0 && map[y][x - 1] === ".") {
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nextMap[y][x - 1] = "O";
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}
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if (x < map[0].length - 1 && map[y][x + 1] === ".") {
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nextMap[y][x + 1] = "O";
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}
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if (y > 0 && map[y - 1][x] === ".") {
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nextMap[y - 1][x] = "O";
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}
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if (y < map.length - 1 && map[y + 1][x] === ".") {
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nextMap[y + 1][x] = "O";
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}
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}
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return nextMap[y][x];
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});
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map = nextMap;
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}
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console.log(mapToString(map));
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function countO(map: string[][]): number {
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return map.flat().filter(x => x === "O").length
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}
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console.log(countO(map));
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