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Intersection of Two Linked Lists

easy Solve on LeetCode Solve on LeetCode

Last edited: August 2, 2025

Problem
Examples
Notes
Solution
Method 1 - Simply Use 2 Loops
Algorithm
Code
Complexity
Method 2 - Add visited flag to linked list node
Complexity
Method 3 - Using visited hashset
Code
Complexity
Method 4 - Use Length Difference of 2 Linked Lists 🥈
Algorithm
Code
Complexity
Method 5 - Without Knowing the Exact Length Difference 🏆
Observations
Algorithm
What if There's No Intersection?
Code
Dry Run
Method 5 - Make Circle in First List
Algorithm
Code

Related Tags

daily-coding-problem hash-table intersection leetcode linkedlist two-pointers

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