42 lines
807 B
TypeScript
42 lines
807 B
TypeScript
const fs = require('fs');
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const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
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const lines = input.split("\n");
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let instructionsStr = lines[4].split(' ')[1];
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const instructions = instructionsStr.split(',').map((i: string) => parseInt(i));
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function run(a: bigint) {
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return (((a & 7n) ^ 7n) ^ (a >> ((a & 7n) ^ 3n))) & 7n;
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}
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let regA = 0n;
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for (let i = instructions.length - 1; i >= 0; i--) {
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for (let a = 0n; a < 8n; a++) {
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const testA = (regA << 3n) + a;
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const out = run(testA);
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if (out === BigInt(instructions[i])) {
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regA = testA;
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break;
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}
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}
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}
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console.log(regA);
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/*
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b = a % 8;
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b = b ^ 3;
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c = a / (2 ** b)
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a = a / 4
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b = b ^ 4
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b = b ^ c
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x = (((a & 7) ^ 7) ^ (a / (2 ** ((a & 7) ^ 3)))) & 7
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*/
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/*
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a = a >> 3
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x = a & 7
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*/ |