Master LeetCode 121: Best Time to Buy and Sell Stock | Brute Force & Single-Pass Solutions Explained

Welcome back to Hack Code! 🎉 In this video, we’ll solve one of the most important LeetCode problems, Best Time to Buy and Sell Stock (LeetCode 121). I’ll walk you through two powerful approaches:

Brute Force Method: Learn the step-by-step process of maximizing profit by comparing each day’s prices.
Optimized Single-Pass Solution: Discover how to track the minimum buy price in one pass and make the problem more efficient.

👨‍💻 By the end of this video, you’ll:

Fully understand the brute force approach and why it’s not optimal
Learn the efficient single-pass method with minimum buy price tracking
Be able to apply these techniques to other coding problems

📊 Complexities Covered:

Time Complexity: O(n)
Space Complexity: O(1)

Why is this important? LeetCode 121 is one of the most frequently asked interview questions, and having a strong grasp of these two methods will put you ahead in coding interviews.

🔥 Make sure to watch till the end and drop a comment if this helped you! Don’t forget to hit like, share this video with fellow coders, and subscribe for more insightful coding content! 🚀

Timestamps:
0:00 Welcome!
0:08 Problem Statement
3:06 About Blind 75
3:33 Approach 1: Brute Force
7:18 Approach 1: Complexities
7:32 Approach 1: Code Demo
8:15 Approach 2: Single Pass with Minimum Buy Price Tracking
11:51 Approach 2: Complexities
12:06 Approach 2: Code Demo
12:51 Outro

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