26 lines
560 B
TypeScript
26 lines
560 B
TypeScript
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import fs from "node:fs";
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const input = fs.readFileSync("inputs/day1").toString();
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const sort = (a: number, b: number) => a - b;
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const lists: number[][] = [];
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input.split("\n").forEach(line => {
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line.split(/\s+/g).forEach((i, list) => {
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lists[list] = lists[list] || [];
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lists[list].push(Number(i));
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})
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})
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lists.forEach(i => i.sort(sort));
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const rows: number[] = [];
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lists[0].forEach((a) => {
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rows.push(a * lists[1].filter(b => a === b).length);
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})
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const result = rows.reduce((prev, cur) => prev + cur);
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console.log(result);
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