#1862Medium#6 in Yandex's list· asked at 7 companies
Swap Nodes in Pairs
Hosted on LeetCode
Solve it on LeetCode, track it here.
This problem's full statement lives on LeetCode. Open it in a new tab, then come back to mark it solved, add notes and keep your streak.
LeetCode Premium locked?
Most company-tagged LeetCode problems are behind Premium. If you have ChatGPT Plus or Claude Pro, ask it for the full statement, examples and constraints. The buttons below open a chat with the prompt already filled in.
What we know
Example 1
Input: head = [1,2,3,4] Output: [2,1,4,3]
Example 2
Input: head = [] Output: []
Example 3
Input: head = [1] Output: [1]
Constraints
- •
The number of nodes in the list is in the range
[0, 100]. - •
0 <= Node.val <= 100