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Contains Duplicate
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.
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.
Example 1
Input: nums = [1,2,3,1]
Output: true
Explanation: The element 1 occurs at the indices 0 and 3.
Example 2
Input: nums = [1,2,3,4]
Output: false
Explanation: All elements are distinct.
Example 3
Input: nums = [1,1,1,3,3,4,3,2,4,2]
Output: true
Constraints
- 1 <= nums.length <= 10^5
- -10^9 <= nums[i] <= 10^9
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