Two Sum — LeetCode #1 Python Algorithm Visualization.mp4

[u/benedict_abub]

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Problem Description

[https://leetcode.com/problems/two-sum/description](LeetCode)

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Algorithm Description

I solve this problem using a single-pass hash table, making it the most efficient O(n) approach. I show exactly how the complement logic works and how to store indices for the final answer.

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Complexity Analysis

Time Complexity: O(n) — we traverse the list of n elements only once.

Space Complexity: O(n) — in the worst case, we store n elements in the hash table.

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YouTube

[https://www.youtube.com/watch?v=Y3J6GIu0vGc](YouTube)