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: true
Example 2:
Input: nums = [1,2,3,4]
Output: false
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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Test: [1,2,3,1]
Test: [1,2,3,4]
Test: [1,1,1,3,3,4,3,2,4,2]
Test: []
Test: [1]
Test: [1,2,3,4,5,6,7,8,9,1]
Test: [0,0]
Test: [-1,-1,-2,-3,-4]
Test: [1.1,1.2,1.3,1.1]