Day 11 [Part 2]

11/part2.js

@@ -0,0 +1,90 @@
+const { readFileSync } = require("fs");
+// Parse Input
+const inputFile = "input.txt";
+let input = readFileSync(inputFile)
+  .toString()
+  .trim()
+  .split(" ")
+  .map((x) => parseInt(x));
+
+let counts = new Array(input.length).fill(1);
+
+function splitNumber(num) {
+  const str = num.toString();
+  const half = str.length / 2;
+  const firstPart = str.slice(0, half);
+  const secondPart = str.slice(half);
+  return [parseInt(firstPart), parseInt(secondPart)];
+}
+
+function tick() {
+  const newInput = [];
+  const newCounts = [];
+
+  input.forEach((e) => {
+    let eCount = counts[input.indexOf(e)];
+
+    if (e == 0) {
+      let index = newInput.indexOf(1);
+
+      if (index >= 0) newCounts[index] += eCount;
+      else {
+        newInput.push(1);
+        newCounts.push(eCount);
+      }
+    } else if (e.toString().split("").length % 2 == 0) {
+      let parts = splitNumber(e);
+      if (parts[0] == parts[1]) {
+        let index = newInput.indexOf(parts[0]);
+        if (index >= 0) {
+          newCounts[index] += eCount * 2;
+        } else {
+          newInput.push(parts[0]);
+          newCounts.push(eCount * 2);
+        }
+      } else {
+        let index0 = newInput.indexOf(parts[0]);
+        let index1 = newInput.indexOf(parts[1]);
+
+        if (index0 >= 0) {
+          newCounts[index0] += eCount;
+        } else {
+          newInput.push(parts[0]);
+          newCounts.push(eCount);
+        }
+
+        if (index1 >= 0) {
+          newCounts[index1] += eCount;
+        } else {
+          newInput.push(parts[1]);
+          newCounts.push(eCount);
+        }
+      }
+    } else {
+      let index = newInput.indexOf(e * 2024);
+      if (index >= 0) newCounts[index] += eCount;
+      else {
+        newInput.push(e * 2024);
+        newCounts.push(eCount);
+      }
+    }
+  });
+
+  input = newInput;
+  counts = newCounts;
+}
+
+for (let i = 0; i < 75; i++) {
+  process.stdout.write(
+    `Tick : ${i + 1}/${25}. Current Result : ${counts.reduce(
+      (acc, value) => acc + value,
+      0
+    )}\r`
+  );
+  tick();
+}
+
+console.log(
+  "\n",
+  counts.reduce((acc, value) => acc + value, 0)
+);