LeetCode 2441. Largest Positive Integer That Exists With Its Negative
Given an integer array nums that does not contain any zeros, find the largest positive integer k such that -k also exists in the array.
Return the positive integer k. If there is no such integer, return -1.
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Time Complexity = O(n), where 'n' is the length of the array
Space Complexity = O(n), where 'n' is the length of the array
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