Day 17 Part 1 WIP

2024/17/index.ts

@@ -0,0 +1,99 @@
+const fs = require('fs');
+
+const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
+
+const lines = input.split("\n");
+
+let registerA = parseInt(lines[0].split(' ')[2]);
+let registerB = parseInt(lines[1].split(' ')[2]);
+let registerC = parseInt(lines[2].split(' ')[2]);
+
+let output: Array<number> = [];
+
+const instructions = lines[4].split(' ')[1].split(',').map((i: string) => parseInt(i));
+
+let pointer = 0;
+
+function combo(op: number): number {
+    if (op <= 3) {
+        return op;
+    }
+    if (op === 4) {
+        return registerA;
+    }
+    if (op === 5) {
+        return registerB;
+    }
+    if (op === 6) {
+        return registerC;
+    }
+    return op;
+}
+
+function call(ins: number, op: number) {
+    if (ins === 0) {
+        op = combo(op);
+        registerA = Math.round(registerA / (2 ** op));
+        return;
+    }
+    if (ins === 1) {
+        registerB = registerB ^ op;
+        return;
+    }
+    if (ins === 2) {
+        op = combo(op);
+        registerB = op % 8;
+        return;
+    }
+    if (ins === 4) {
+        registerB = registerB ^ registerC;
+        return;
+    }
+    if (ins === 5) {
+        op = combo(op);
+        output.push(op % 8);
+        return;
+    }
+    if (ins === 6) {
+        op = combo(op);
+        registerB = Math.round(registerA / (2 ** op));
+        return;
+    }
+    if (ins === 7) {
+        op = combo(op);
+        registerC = Math.round(registerA / (2 ** op));
+        return;
+    }
+}
+
+function printPC() {
+    console.log(`
+A: ${registerA}
+B: ${registerB}
+C: ${registerC}
+
+ins: ${typeof instructions[pointer] !== 'undefined' ? instructions[pointer] : 'NA'}
+op: ${typeof instructions[pointer+1] !== 'undefined' ? instructions[pointer+1] : 'NA'}
+combo: ${typeof instructions[pointer+1] !== 'undefined' ? combo(instructions[pointer+1]) : 'NA'}
+
+Output: ${output.join(',')}
+`);
+}
+
+function run() {
+    while (pointer < instructions.length) {
+        printPC();
+        const ins = instructions[pointer];
+        const op = instructions[pointer + 1];
+
+        if (ins === 3) {
+            pointer = registerA === 0 ? pointer + 2 : op;
+        } else {
+            call(ins, op);
+            pointer += 2;
+        }
+    }
+    printPC();
+}
+
+run();