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@abhisek247767 for issue #150 and please add hacktoberfest label to this pr.
🟢 Title : Contains Duplicate 🟢 Programming language : C++ 🟢 Objective : Return true if any value appears at least twice in the array 🟢 Summary : 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