easy Arrays & Hashing
Contains Duplicate
Return true if any value appears at least twice in `nums`, and false if every element is distinct. Example: [1, 2, 3, 1] → true; [1, 2, 3, 4] → false.
runs in your browser
Return true if any value appears at least twice in `nums`, and false if every element is distinct. Example: [1, 2, 3, 1] → true; [1, 2, 3, 4] → false.