70. Contains Duplicate

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Input: nums = [1,2,3,1]

Output: true

Explanation: The element 1 occurs at the indices 0 and 3.

Input: nums = [1,2,3,4]

Output: false

Explanation: All elements are distinct.

Input: nums = [1,1,1,3,3,4,3,2,4,2]

Output: true

Time Complexity

O(n)

Space Complexity

O(n)