Linked List Algorithm Implementations
Swapping Nodes in PairsApproach: Using a dummy head nodeLogic: Create a dummy head node to simplify the swapping process. Use a current pointer that moves forward two steps at a time. The loop continues as long as there are at least two more nodes to swap.Implementation:/**
* Definition for singly-linked list.
* struct ListNode {
* int v ...
Posted on Sat, 09 May 2026 03:30:26 +0000 by drorshem
Java Solutions for LeetCode Linked List Problems Following Code Record
Remove Linked List Elements (LeetCode 203)
Given the head of a linked list and an integer val, remove all nodes where Node.val == val and return the new head node.
Using a dummy head simplifies handling edge cases, especially when the head node itself needs to be removed. A traversal pointer prev is used to point to the node preceding the one c ...
Posted on Fri, 08 May 2026 12:36:38 +0000 by Anti-Moronic
Linked List Problems: Swap Pairs, Remove Nth From End, Intersection, and Cycle Detection
24. Swap Nodes in Pairs
Problem: Swap adjacent nodes in a linked list pairwise, returnnig the new head. Do not modify node values—only rewire nodes.
Approaches:
Iterative: Use a dummy head to track the previous node. Adjust pointers for each pair.
Recursive: Swap the first two nodes, then recurce on the reamining list.
class Solution:
...
Posted on Fri, 08 May 2026 00:18:32 +0000 by dey.souvik007