Linked List Operations: Node Swapping, Removal, Intersection, and Cycle Detection
Pairwise Node Swapping in Linked List
Given a linked list, swap every two adjacnet nodes and return the modified list's head. Node values must not be altered; only node positions can be chenged.
Example:
Input: head = [1,2,3,4]
Output: [2,1,4,3]
Solution: Use three pointers to manage node connections during swapping.
class Solution {
publi ...
Posted on Fri, 22 May 2026 21:15:12 +0000 by shenmue232