25 lines
684 B
TypeScript
25 lines
684 B
TypeScript
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const input = await Deno.readTextFile("./input.txt").then(
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(f) =>
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f.split("\n").reduce<[number[], number[]]>(
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(
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acc,
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cur,
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) => [[...acc[0], +cur.split(" ")[0]], [
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...acc[1],
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+cur.split(" ")[1],
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]],
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[[], []],
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),
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).then(([first, second]) => [
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first,
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second.reduce((acc, cur) => {
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if (acc[cur] !== undefined) acc[cur]++;
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else acc[cur] = 1;
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return acc;
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}, {} as Record<number, number>),
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]).then(([first, map]) =>
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first.reduce((acc, cur) => acc + ((map[cur] ?? 0) * cur), 0)
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);
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console.log("Answer = " + input);
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