LeetCode_217: Contains Duplicate | HashSet Approach (Optimal Solution)

In this video, I solve LeetCode Problem 217 - Contains Duplicate using the HashSet approach, which is the most efficient method.

🔍 What you'll learn:

How HashSet helps in detecting duplicates efficiently
Step-by-step explanation of the logic
Why this approach is faster than brute force and sorting
Time and space complexity breakdown

💡 We use a HashSet to track elements while iterating. If an element already exists in the set, a duplicate is found immediately.

⏱ Time Complexity: O(n)
📦 Space Complexity: O(n)

📚 Problem Link:
https://leetcode.com/problems/contains-duplicate/

🚀 This is the optimal solution commonly asked in coding interviews.

#leetcode #dsa #hashset #algorithms #coding #programming #interviewprep

Видео LeetCode_217: Contains Duplicate | HashSet Approach (Optimal Solution) канала Nafisa Tabassum