Swap Consecutive Index Pairs

Given a list of integers nums, swap each consecutive even indexes with each other, and swap each consecutive odd indexes with each other.

Constraints

• n ≤ 100,000 where n is the length of nums

https://binarysearch.com/problems/Swap-Consecutive-Index-Pairs

Examples

Example 1

Input

• nums = [0, 1, 2, 3, 4, 5, 6, 7, 8]

Output

• answer = [2, 3, 0, 1, 6, 7, 4, 5, 8]

Explanation

• 0 and 2 gets swapped
• 1 and 3 gets swapped
• 4 and 6 gets swapped
• 5 and 7 gets swapped
• 8 remains the same

Solution