41 lines
1,023 B
TypeScript
41 lines
1,023 B
TypeScript
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import fs from "node:fs";
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const input = fs.readFileSync("inputs/day3").toString();
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function puzzle1() {
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const mul_regex = /mul\(([0-9]{1,3}),([0-9]{1,3})\)/g;
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let sum = 0;
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let match: RegExpExecArray | null = null;
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while ((match = mul_regex.exec(input)) !== null) {
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sum += +match[1] * + +match[2];
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}
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return sum;
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}
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console.log("Puzzle 1", puzzle1());
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function puzzle2() {
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const toggle_regex = /(?:do|don't)\(\)|mul\(([0-9]{1,3}),([0-9]{1,3})\)/g;
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let enabled = true;
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let sum = 0;
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let match: RegExpExecArray | null = null;
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while ((match = toggle_regex.exec(input)) !== null) {
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switch (match[0]) {
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case "do()":
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enabled = true;
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break;
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case "don't()":
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enabled = false;
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break;
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default:
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if (!enabled) break;
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sum += +match[1] * + +match[2];
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break;
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}
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}
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return sum;
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}
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console.log("Puzzle 2", puzzle2());
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