54 lines
1.2 KiB
TypeScript
54 lines
1.2 KiB
TypeScript
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const txt = await Deno.readTextFile("input.txt");
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const map = txt.split("\n").map((row) => row.trim().split(""));
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function isOutOfBounds(map: string[][], [x, y]: [number, number]) {
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const w = map[0].length;
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const h = map.length;
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return x < 0 || x >= w || y < 0 || y >= h;
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}
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const patterns = [
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["M", "M", "S", "S"],
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["M", "S", "M", "S"],
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["S", "M", "S", "M"],
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["S", "S", "M", "M"],
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];
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const patternPositions = [
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[-1, -1],
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[1, -1],
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[-1, 1],
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[1, 1],
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];
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function findXMasPatternInPos(
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map: string[][],
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[x, y]: [number, number],
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) {
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if (isOutOfBounds(map, [x, y])) {
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return 0;
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}
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if (map[y][x] != "A") {
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return 0;
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}
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let count = 0;
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patterns.forEach((pattern) => {
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for (let i = 0; i < pattern.length; i++) {
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const [dx, dy] = patternPositions[i];
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const [nx, ny] = [x + dx, y + dy];
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if (isOutOfBounds(map, [nx, ny]) || map[ny][nx] != pattern[i]) {
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return;
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}
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}
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count++;
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});
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return count;
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}
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let count = 0;
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for (let i = 0; i < map.length; i++) {
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for (let j = 0; j < map[0].length; j++) {
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count += findXMasPatternInPos(map, [j, i]);
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}
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}
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console.log(count);
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