Classic Linked List Techniques: Pairwise Swapping, Backward Deletion, Intersection, and Cycle Entry Detection
Swappnig Adjacent Nodes in Pairs
Given a linked list, swap every two adjacent nodes and return the head pointer. Only pointer manipulation is allowed; nodde values must remain unchanged.
A sentinel node simplifies boundary handling. Maintain a prev pointer positioned immediately before each pair. In every iteration, identify the first node, the ...
Posted on Sat, 09 May 2026 16:12:35 +0000 by sonofsam