Day 11

2024/11/index.ts

@@ -4,9 +4,11 @@ const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
 
 let stones: Array<string> = input.slice(0, -1).split(' ');
 
+const countMap: { [key: string]: Array<number> } = {};
+
 let sum = 0;
 
-function splitStones(stones: Array<string>) {
+function getCountAfter(stone: string, blink: number) {
     const newStones: Array<string> = [];
     stones.forEach((stone) => {
         if (stone === '0') {
@@ -22,16 +24,17 @@ function splitStones(stones: Array<string>) {
         }
         newStones.push(''+(parseInt(stone) * 2024));
     });
+    if (blink === 1) {
         return newStones;
+    }
+    return newStones.sum((newStone) => getCountAfter(newStone, blink - 1));
 }
 
-let newStones = stones;
-
 const blinks = 25;
 
-for (let i = 0; i < blinks; i++) {
-    newStones = splitStones(newStones);
-}
+stones.forEach((stone) => {
+    sum += getCountAfter(stone, 25);
+});
 
-console.log(newStones.length);
+console.log(sum);