69 lines
1.5 KiB
JavaScript
69 lines
1.5 KiB
JavaScript
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import fs from "fs-extra";
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import fp from "lodash/fp.js";
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import _ from "lodash";
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export const processInput = (file) =>
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fs.readFile(file, "utf8").then((content) =>
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content
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.split("\n")
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.filter((x) => x)
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.map((line) => line.split("").map((x) => parseInt(x)))
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);
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export const genNeighbours = (maxX, maxY) => (x, y) =>
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[
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[-1, 0],
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[1, 0],
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[0, 1],
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[0, -1],
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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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.map((delta) => _.zip(delta, [x, y]).map(_.sum))
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.filter(([x, y]) => {
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if (x < 0 || y < 0) return false;
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if (x >= maxX || y >= maxY) return false;
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return true;
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});
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function powerUp(x, y, grid, toClear) {
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grid[x][y]++;
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if (grid[x][y] !== 10) return 0;
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// FLASH!
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toClear.push([x, y]);
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return _.sum([
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1,
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...genNeighbours(grid.length, grid[0].length)(x, y).map((coords) =>
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powerUp(...coords, grid, toClear)
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),
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]);
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}
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export function playTurn(grid) {
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let flashes = 0;
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let toClear = [];
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for (const x in grid) {
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for (const y in grid[x]) {
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flashes += powerUp(parseInt(x), parseInt(y), grid, toClear);
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}
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}
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for (const [x, y] of toClear) {
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grid[x][y] = 0;
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}
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return flashes;
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}
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export const printGrid = (grid) =>
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grid.forEach((line) => console.log(line.join("")));
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export const solution = (grid) =>
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_.sum(_.range(100).map(() => playTurn(grid)));
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