33 lines
859 B
TypeScript
33 lines
859 B
TypeScript
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export function mix(a: bigint, b: bigint): bigint {
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return a ^ b;
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}
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export function prune(a: bigint): bigint {
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// return a % 16777216n; // 2^24
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return a & 0xFFFFFFn;
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}
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export function generate(secret: bigint): bigint {
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let r = secret;
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r = mix(r, r << 6n); // multiply by 64
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r = prune(r);
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r = mix(r, r >> 5n); // shift right 5
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r = prune(r);
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r = mix(r, r << 11n);
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r = prune(r);
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return r;
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}
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export function advance(secret: bigint, n: number): bigint {
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let r = secret;
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for (let i = 0; i < n; i++) {
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r = generate(r);
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}
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return r;
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}
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if (import.meta.main) {
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const initialNumbers = (await Deno.readTextFile("input.txt")).replaceAll("\r","").split("\n").map(x => BigInt(parseInt(x)));
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const sum = initialNumbers.map(x => (advance(x, 2000))).reduce((a, b) => a + b, 0n);
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console.log(sum);
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}
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