Solve 11

src/11/index.ts

@@ -0,0 +1,56 @@
+import fs from "fs"
+
+const content = fs.readFileSync('input.txt', 'utf-8');
+const numbers = content.split(" ").map(str => Number(str))
+interface Stone {
+    value: number;
+    count: number;
+}
+
+function blink(numArr: number[]) {
+    for (let i = 0; i < numArr.length; i++) {
+        if (numArr[i] === 0) {
+            numArr[i] = 1
+        } else if (numArr[i].toString(10).length % 2 === 0) {
+            const str = "" + numArr[i].toString(10)
+            const left = str.substring(0, str.length / 2)
+            const right = str.substring(str.length / 2, str.length)
+            numArr[i] = Number(left);
+            i++;
+            numArr.splice(i, 0, Number(right))
+
+        } else {
+            numArr[i] = numArr[i] * 2024
+        }
+    }
+}
+const a1 = structuredClone(numbers)
+for (let i = 0; i < 25; i++) {
+    blink(a1)
+}
+console.log(a1.length)
+let a2: Map<number,number> = new Map;
+numbers.forEach(num => a2.set(num,1));
+for (let i = 0; i < 75; i++) {
+    const newMap:Map<number,number> = new Map;
+    a2.forEach((value, number, map) => {
+        if (number === 0) {
+            newMap.set(1, (newMap.get(1) ?? +0) + (value))
+        } else if (number.toString(10).length % 2 === 0) {
+            const str = "" + number.toString(10)
+            const left = Number(str.substring(0, str.length / 2))
+            const right = Number(str.substring(str.length / 2, str.length))
+            newMap.set(left, (newMap.get(left) ?? +0) + value)
+            newMap.set(right, (newMap.get(right) ?? +0) + value)
+
+        } else {
+            newMap.set(number*2024,value);
+        }
+    })
+    a2 = newMap;
+}
+let stoneSum = 0;
+a2.forEach((value, key, map) => {
+    stoneSum += value
+})
+console.log(stoneSum)