Given an integer array nums of length n where all the integers of nums are in the range [1, n] and each integer appears once or twice, return an array of all the integers that appears twice. You must ...

// https://www.naukri.com/code360/problems/find-duplicate-in-array_1112602?leftPanelTabValue=PROBLEM // https://leetcode.com/problems/find-the-duplicate-number/ ...