Year 2023, Day 4

clients/typescript/solutions/S2304.ts

@@ -0,0 +1,24 @@
+import ISolution from "./ISolution.ts";
+
+export default class S2303 implements ISolution {
+  firstPart(input: string): string | number {
+    return input.split('\n').map(line => {
+        const numbers = line.split(': ')[1].split(' | ').map(s => s.split(' ').filter(s => s !== '').map(Number));
+        return numbers[1].filter(n => numbers[0].includes(n)).length;
+    }).map(n => n > 0 ? 2**(n-1) : 0).reduce((a, b) => a + b, 0);
+  }
+  secondPart(input: string): string | number {
+    const winners = input.split('\n').map(line => {
+        const numbers = line.split(': ')[1].split(' | ').map(s => s.split(' ').filter(s => s !== '').map(Number));
+        return numbers[1].filter(n => numbers[0].includes(n)).length;
+    });
+    const cards: number[] = winners.map(_ => 1);
+    winners.forEach((winner, index) => {
+        for (let i = 0; i < winner; i++) {
+            cards[index+i+1] += cards[index];
+        }
+    });
+    return cards.reduce((a, b) => a + b, 0);
+  }
+
+}