solve: Week 01 contains duplicate

Author: eunice-hong

contains-duplicate/eunice-hong.ts

@@ -0,0 +1,15 @@
+
+/**
+ * Determines if the array contains any duplicate values.
+ * Uses a Set to track seen numbers for O(n) time complexity.
+ *
+ * @param nums - An array of integers.
+ * @returns `true` if there are duplicates, `false` otherwise.
+ *
+ * Time Complexity: O(n)
+ * Space Complexity: O(n)
+ */
+function containsDuplicate(nums: number[]): boolean {
+  let numSet = new Set(nums);
+  return numSet.size != nums.length;
+};