The problem focuses on detecting duplicate integers within an input array. The function should return true if any integer appears more than once; otherwise, it returns false.
Several examples illustrate different scenarios:
[1, 2, 3, 4] returns false (no duplicates)[1, 2, 3, 1] returns true (1 is duplicated)[3, 2, 6, -1, 2, 1] returns true (2 is duplicated)The input array's length is constrained between 1 and 105 elements (inclusive), and each integer within the array falls within the range of -109 to 109 (inclusive).
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, 4]
Output: false
Explanation: There are no duplicates in the given array.
Example 2:
Input: nums= [1, 2, 3, 1]
Output: true
Explanation: '1' is repeating.
Example 3:
Input: nums= [3, 2, 6, -1, 2, 1]
Output: true
Explanation: '2' is repeating.
Constraints:
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