Remove Duplicates from Sorted List II | Brute force to Optimised | Java C++ Python
In this video, we'll solve Remove Duplicates from Sorted List II (LeetCode 82), one of the most important Linked List interview questions asked in product-based companies.
Unlike the basic version, this problem requires us to remove all nodes that have duplicate values, leaving only the distinct numbers in the final linked list. We'll solve it using the Dummy Node Pattern, which simplifies handling edge cases such as duplicate nodes appearing at the beginning of the list.
This problem is an excellent example of pointer manipulation and is frequently asked in coding interviews.
What you'll learn:
Understanding the problem statement
Why a Dummy Node is required
Handling duplicate sequences efficiently
Step-by-step dry run
Optimal Java solution
Time & Space Complexity analysis
Interview tips and common mistakes
Pattern Covered:
Linked List
Dummy Node Pattern
Two Pointer Technique
Pointer Manipulation
Time Complexity:
O(N)
Space Complexity:
O(1)
Rising Brain (DSA Sheet):
https://www.risingbrain.org/sheet
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