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47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
4 years ago
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const fs = require("fs");
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const input = fs.readFileSync("input", "utf-8").trim().split("\n");
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function main() {
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// original mask string
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let mask = null;
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const memory = [];
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for (const line of input) {
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if (line.startsWith("mask")) {
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mask = line.slice(7);
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} else {
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const address = parseInt(line.slice(4));
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const num = BigInt(parseInt(line.split(" = ")[1]));
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memory[address] = apply(num, mask);
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// debug(num, mask);
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}
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}
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const sum = memory.reduce((a, b) => a + b, 0n);
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console.log("Solution:");
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console.log(sum.toString());
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}
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function debug(value, mask) {
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const result = apply(value, mask);
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console.log("=".repeat(18), " DEBUG ", "=".repeat(18));
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console.log(`value: ${numToBin(value)} (decimal ${value})`);
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console.log(`mask: ${mask}`);
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console.log(`result: ${numToBin(result)} (decimal ${result})`);
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}
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function numToBin(num) {
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return num.toString(2).padStart(36, "0");
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}
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function binToNum(bin) {
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return BigInt(parseInt(bin, 2));
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}
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function apply(num, mask) {
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num = num & binToNum(mask.replaceAll("X", 1));
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num = num | binToNum(mask.replaceAll("X", 0));
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return num;
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}
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main();
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