Problem Statement
Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.
Examples
Example 1:
Input: nums= [1, 2, 3, 4]
Output: false
Explanation: There are no duplicates in the given array.
Example 2:
Input: nums= [1, 2, 3, 1]
Output: true
Explanation: '1' is repeating.
Example 3:
Input: nums= [3, 2, 6, -1, 2, 1]
Output: true
Explanation: '2' is repeating.
Constraints:
- 1 <= nums.length <= 10^5
- -10^9 <= nums[i] <= 10^9