LeetCode — Find the duplicated number
Given an array of integers
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 uses only constant extra space.
Input: nums = [1,3,4,2,2]
Input: nums = [3,1,3,4,2]
1 <= n <= 105
nums.length == n + 1
1 <= nums[i] <= n
- All the integers in
numsappear only once except for precisely one integer which appears two or more times.