Solve 2024-03

2024/03/index.ts

@@ -0,0 +1,18 @@
+import { sumArray } from '../../utils/array';
+
+export function solveFirst(input: string): number {
+  return sumArray(findAndEvalMul(input));
+}
+
+function findAndEvalMul(line?: string | null | undefined) {
+  return Array.from(
+    (line || '').matchAll(/mul\((\d{1,3}),(\d{1,3})\)/gm),
+    (m) => Number(m[1]) * Number(m[2])
+  );
+}
+
+export function solveSecond(input: string): number {
+  const splits = input.split('do()').map((l) => l.split("don't()")[0]);
+
+  return sumArray(splits.flatMap(findAndEvalMul));
+}