LeetCode 219 | Contains Duplicate II | Sliding Window | Java
Автор: @AlgoRohitRawat
Загружено: 2026-02-23
Просмотров: 4
Описание:
In this video, we solve the popular Contains Duplicate II (LeetCode 219) problem step by step. This is a beginner-friendly array + hashing problem that is commonly asked in coding interviews and placement rounds.
You’ll learn:
Clear problem explanation with examples
Understanding the difference between duplicate value and index distance
How to use HashMap efficiently
Optimized O(n) solution approach
Sliding window concept (optional optimization)
Java implementation
Time & Space Complexity analysis
Chapters:
0:00 Problem Explanation
2:12 Example Walkthrough
3:36 Brute Force Approach
8:19 Optimized Approach Logic
12:11 Sliding Window Visualization
18:04 Java Code Implementation
20:25 Complexity Analysis
We will understand how to track previously seen elements and check whether the index difference is at most k in a single traversal.
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#DSA #ContainsDuplicateII #LeetCode219 #Java #HashMap #CodingInterview #PlacementPreparation
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