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.
Example 1
Input
nums = [1,2,3,1]Output
trueThe element 1 occurs at the indices 0 and 3.
Example 2
Input
nums = [1,2,3,4]Output
falseAll elements are distinct.
Constraints
- 1 <= nums.length <= 10^5
- -10^9 <= nums[i] <= 10^9
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