Day 24 Part 2 Complete

2024/24/index2.ts

@@ -34,6 +34,9 @@ const gates: Array<[string, string, string, string]> = gatesStr.split("\n").map(
     return [val1, op, val2, out];
 });
 gates.forEach(([val1, op, val2, out]) => {
+    if (out[0] === 'z') {
+        outputWires.push(out);
+    }
     gateMap[out] = [val1, op, val2];
 });
 
@@ -61,7 +64,7 @@ function getVal(wire1: string, op: string, wire2: string, trace: Array<string> =
     }[op]!();
 }
 
-outputWires.sort().reverse();
+outputWires.sort();
 const expected = (parseInt(xStr, 2) + parseInt(yStr, 2)).toString(2);
 
 function calculate() {
@@ -78,6 +81,13 @@ function swap(wire1: string, wire2: string): void {
     const wire2Gate = gateMap[wire2];
     gateMap[wire1] = wire2Gate;
     gateMap[wire2] = wire1Gate;
+    gates.forEach((gate) => {
+        if (gate[3] === wire1) {
+            gate[3] = wire2;
+        } else if (gate[3] === wire2) {
+            gate[3] = wire1;
+        }
+    });
 }
 
 interface HalfAdder {
@@ -102,22 +112,95 @@ interface FullAdder {
     carryGate: [string, string, string, string],
 }
 
-function getGate(a: string, b: string, operator: string): undefined|[string, string, string, string] {
+const swaps: Array<string> = [];
-    return gates.find(([val1, op, val2]) => {
+
+function getGate(a: string, b: string, operator: string): [string, string, string, string] {
+    const gate = gates.find(([val1, op, val2]) => {
         return op === operator
-            && ((a === val1 && b === val2) || a === val2 && b === val1);
+            && (a === val1 || b === val2 || a === val2 || b === val1);
     });
+    if (!gate) {
+        throw new Error(`Two bad inputs, could not find gate, ${a}, ${b}`);
+    }
+    if ((gate[0] === a && gate[2] === b) || (gate[0] === b && gate[2] === a)) {
+        return gate;
+    }
+    console.log(gate, a, b, operator);
+    let wrongInput: string;
+    let shouldBe: string;
+    if (gate[0] === a) {
+        wrongInput = b;
+        shouldBe = gate[2]
+    } else if (gate[0] === b) {
+        wrongInput = a;
+        shouldBe = gate[2]
+    } if (gate[2] === a) {
+        wrongInput = b;
+        shouldBe = gate[0]
+    } else {
+        wrongInput = a;
+        shouldBe = gate[0]
+    }
+    swaps.push(wrongInput);
+    swaps.push(shouldBe);
+    swap(wrongInput, shouldBe);
+
+    console.log(`Wrong input found, ${wrongInput} should be ${shouldBe}`)
+    return gate;
 }
 
 const carryGate = getGate('x00', 'y00', 'AND');
-const sumGate = getGate('x00', 'y00', 'OR');
+const sumGate = getGate('x00', 'y00', 'XOR');
 const halfAdder: HalfAdder = {
     x: 'x00',
     y: 'y00',
     out: 'z00',
-    carry: carryGate![3],
+    carry: carryGate[3],
-    carryGate: carryGate!,
+    carryGate: carryGate,
-    sumGate: sumGate!,
+    sumGate: sumGate,
 }
 
-console.log(halfAdder);
+console.log(halfAdder);
+
+function getAdder(x: string, y: string, carryIn: string, out: string): FullAdder {
+    const halfSumGate = getGate(x, y, 'XOR');
+    const fullSumGate = getGate(halfSumGate[3], carryIn, 'XOR');
+    if (fullSumGate[3] !== out) {
+        console.log(`Wrong input found, ${fullSumGate[3]} should be ${out}`)
+        swaps.push(fullSumGate[3]);
+        swaps.push(out);
+        swap(fullSumGate[3], out);
+    }
+    const sumCarryGate = getGate(halfSumGate[3], carryIn, 'AND');
+    const inputCarryGate = getGate(x, y, 'AND')!;
+    const carryGate = getGate(sumCarryGate[3], inputCarryGate[3], 'OR');
+    return {
+        x,
+        y,
+        carryIn,
+        out: fullSumGate[3],
+        carry: carryGate[3],
+        halfSumGate,
+        fullSumGate,
+        sumCarryGate,
+        inputCarryGate,
+        carryGate
+    };
+}
+
+let carry = halfAdder.carry;
+
+for (let out of outputWires) {
+    if (out === 'z00' || out === 'z45') {
+        continue;
+    }
+    const x = out.replace('z', 'x');
+    const y = out.replace('z', 'y');
+
+    const adder = getAdder(x, y, carry, out);
+    console.log(adder, swaps);
+    carry = adder.carry;
+}
+
+swaps.sort();
+console.log(swaps.join(','));