Two Sum Explained Properly | From Brute Force to Hashing (Python)
Автор: Let'sStart2Finish
Загружено: 2025-12-22
Просмотров: 16
Описание:
Why is Two Sum the most famous coding interview problem?
Because it teaches hashing the right way.
In this video, we solve Two Sum step-by-step:
Beginner brute force approach
Improved brute force
Optimal hash table solution
Why each version is better than the previous one
How hashing turns O(n²) into O(n)
You’ll learn:
What a canonical hashing problem is
How to think in complements
Why memory beats scanning
How Python dicts enable instant lookups
Perfect foundation before solving:
3Sum
Frequency map problems
Sliding window patterns
#python #leetcode #twosum #hashtable #codinginterviews #datastructures
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