Linked List Algorithms: Pair Swapping, Node Removal, Intersection Detection, and Cycle Identification
24. Swap Nodes in Pairs
Problem Link: LeetCode 24
Solution:
This problem involves swapping adjacent nodes in a linked list in pairs. A dummy head node simplifies edge case handling, such as when the list has only one or two nodes.
struct ListNode {
int val;
ListNode *next;
ListNode(int x) : val(x), next(nullptr) {}
};
class Soluti ...
Posted on Tue, 19 May 2026 01:54:15 +0000 by Buttero