Day 24 Part 1

2024/24/index.ts

@@ -0,0 +1,54 @@
+const fs = require('fs');
+
+const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
+
+const [initStr, gatesStr] = input.split("\n\n");
+
+const valMap: { [key: string]: number }= {};
+const gateMap: { [key: string]: [string, string, string] } = {};
+
+const outputWires: Array<string> = [];
+
+initStr.split("\n").forEach((s: string) => {
+    const [wire, val] = s.split(': ');
+    valMap[wire] = parseInt(val, 2);
+});
+
+gatesStr.split("\n").forEach((s: string) => {
+    const [inp, out] = s.split(' -> ');
+    const [val1, op, val2] = inp.split(' ');
+    gateMap[out] = [val1, op, val2];
+    if (out.startsWith('z')) {
+        outputWires.push(out);
+    }
+});
+
+function getWireVal(wire: string): number {
+    if (Object.hasOwn(valMap, wire)) {
+        return valMap[wire];
+    }
+    const val = getVal(...gateMap[wire])
+    valMap[wire] = val;
+    return val;
+}
+
+function getVal(wire1: string, op: string, wire2: string): number {
+    const val1 = getWireVal(wire1);
+    const val2 = getWireVal(wire2);
+
+    return {
+        AND: () => val1 & val2,
+        OR: () => val1 | val2,
+        XOR: () => val1 ^ val2,
+    }[op]!();
+}
+
+outputWires.sort().reverse();
+
+let outputStr = '';
+
+outputWires.forEach((wire) => {
+    outputStr += getWireVal(wire);
+});
+
+console.log(outputStr, parseInt(outputStr, 2));