easyArrays & Hashing
Contains Duplicate
## Problem
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.
Examples
Input
nums = [1,2,3,1]
Output
true
1 appears at index 0 and 3
Input
nums = [1,2,3,4]
Output
false
All elements are distinct
Constraints
1 <= nums.length <= 10^5
-10^9 <= nums[i] <= 10^9
Python
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