feat(leetcode): add 2667 easy

Author: benben6515

leetcode-easy/2620-counter.ts

@@ -11,7 +11,7 @@ function createCounter(n: number): () => number {
  * counter() // 12
  */
 
-// 2023.05.07 Done.
+// 2023/05/07 done.
 // Runtime 66 ms
 // Beats 29.11%
 // Memory 43.2 MB

leetcode-easy/2667-creat-hello-world-function.ts

@@ -0,0 +1,15 @@
+function createHelloWorld() {
+  return function(...args): string {
+    return 'Hello World'
+  }
+}
+
+/**
+ * const f = createHelloWorld();
+ * f(); // "Hello World"
+ *
+ */
+
+// 2023/05/07 done
+// Runtime 66 ms Beats 25%
+// Memory 42.7 MB Beats 66.88%