95 lines
2.4 KiB
JavaScript
95 lines
2.4 KiB
JavaScript
import { promises as fsPromises } from "node:fs";
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async function asyncReadFile(filename) {
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try {
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const contents = await fsPromises.readFile(filename, "utf-8");
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const arr = contents.split(/\r?\n/);
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return arr;
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} catch (err) {
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console.error(err);
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}
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}
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const useTestData = false;
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const testDataToParse = `
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..@@.@@@@.
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@@@.@.@.@@
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@@@@@.@.@@
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@.@@@@..@.
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@@.@@@@.@@
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.@@@@@@@.@
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.@.@.@.@@@
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@.@@@.@@@@
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.@@@@@@@@.
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@.@.@@@.@.
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`;
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const dataToParse = await asyncReadFile("../input.txt");
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const rows = useTestData
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? testDataToParse
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.trim()
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.split("\n")
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.map((val) => Array.from(val))
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: dataToParse.map((val) => Array.from(val));
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const newData = Array.from({ length: rows.length }, () =>
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new Array(rows[0].length).fill(".")
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);
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let countWithLessThanFourAdjacent = 0;
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rows.forEach((row, rowIndex) => {
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row.forEach((val, colIndex) => {
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if (val !== "@") return;
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let adjacentCount = 0;
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if (rowIndex > 0 && rows[rowIndex - 1][colIndex] === "@")
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adjacentCount++; // UM
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if (
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rowIndex > 0 &&
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colIndex < row.length - 1 &&
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rows[rowIndex - 1][colIndex + 1] === "@"
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)
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adjacentCount++; // UR
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if (colIndex < row.length - 1 && row[colIndex + 1] === "@")
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adjacentCount++; // MR
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if (
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rowIndex < rows.length - 1 &&
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colIndex < row.length - 1 &&
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rows[rowIndex + 1][colIndex + 1] === "@"
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)
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adjacentCount++; // DR
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if (rowIndex < rows.length - 1 && rows[rowIndex + 1][colIndex] === "@")
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adjacentCount++; // DM
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if (
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rowIndex < rows.length - 1 &&
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colIndex > 0 &&
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rows[rowIndex + 1][colIndex - 1] === "@"
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)
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adjacentCount++; // DL
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if (colIndex > 0 && row[colIndex - 1] === "@") adjacentCount++; // LM
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if (
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rowIndex > 0 &&
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colIndex > 0 &&
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rows[rowIndex - 1][colIndex - 1] === "@"
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)
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adjacentCount++; // UL
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if (adjacentCount < 4) {
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countWithLessThanFourAdjacent++;
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newData[rowIndex][colIndex] = "x";
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} else newData[rowIndex][colIndex] = "@";
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});
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});
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console.log(`Found ${countWithLessThanFourAdjacent}`);
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if (useTestData)
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console.log("\n", {
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newData: `\n${newData.map((row) => row.join("")).join(`\n`)}`,
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});
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