172. Contains Duplicate

EasyArray

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

Input: [1,2,3,1]

Output: true

Explanation: The value 1 appears at indices 0 and 3, so a duplicate exists.

Constraints

1 <= nums.length <= 10^5
-10^9 <= nums[i] <= 10^9

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