Find the Duplicate Number

The problem Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. There is only one repeated number in nums, return this repeated number. You must solve the problem without modifying the array nums and using only constant extra space. Examples Input: nums = [1,3,4,2,2] Output: 2 Input: nums = [3,1,3,4,2] Output: 3 Input: nums = [3,3,3,3,3] Output: 3 Constraints 1 <= n <= 10^5 nums.length == n + 1 1 <= nums[i] <= n All the integers in nums appear only once except for precisely one integer which appears two or more times. Follow up: ...