Solving Contains Duplicate: The Mindset Behind Efficient Array Problems

Explanation of why this Problem matters.

It is a Data Structures and Algorithms Problem named Contains Duplicate.
This is a classic beginner array problem in LeetCode.Though it looks simple, It Teaches you how to think about Time Complexity, optimal solutions, and the use of the hash Set in problem-solving.

Problem Statement

Given an array, return true if the array has duplicates, return false otherwise.

Optimal Solution

Complexity

→ Time Complexity: O(N)
→ Space Complexity: O(N)
Explanations:
→ Why hash sets:
Efficient, Practical, and Ready for Bigger Problems

What I Learned

1. This Pattern repeats in many problems - spotting duplicates faster
2. Optimize Early, Think About Constraints

Conclusion

Mastering these small problems day by day makes the mind strong for larger and harder problems. This is not about duplication, It is about changing our brains to think more efficiently