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.

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Contains Duplicate
easy
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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: [1,2,3,1]
Output: true
Constraints:

  • 1≤nums.length≤1051 \leq \text{nums.length} \leq 10^5

  • −109≤nums[i]≤109-10^9 \leq \text{nums}[i] \leq 10^9

Input
arr =[1,2,3,1]
nums10213213
HashSet

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Variables
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DepthFunction Call
1containsDuplicate(nums=[1, 2, 3, 1])
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