Correct an In-Place Array Reversal
Duolingo● EasyINTERNPHONE SCREENProblem statement
A proposed reversal loops over every index and swaps each element with its mirror. That swaps every pair twice and restores the original array.
Given nums, reverse it in place by swapping each mirrored pair exactly once, then return the same array.
Function
reverseArray(nums: int[]) → int[]Examples
Example 1
nums = [1,2,3,4]return = [4,3,2,1]Swap indices 0 and 3, then 1 and 2.
Example 2
nums = [7]return = [7]A one-element array is already reversed.
Constraints
0 <= nums.length <= 100000-1000000000 <= nums[i] <= 1000000000- Use
O(1)extra space.