[Complete Series] Best Time to Buy and Sell Stock | LeetCode | Recursion & DP Solution, Explained

LeetCode: Best Time to Buy and Sell Stock is a popular series of problems on recursion & dynamic programming. In this compilation, I present the solutions to ALL problems – using just ONE approach.
I go over the intuitions, observations and the simulations required to understand the logic of the solution for best time to buy and sell stock II and then realize how well it extends to the other problems.

Writeup (Summary + Code):
https://chaudhary1337.com/best-time-t...

Problem links:
122. Best Time to Buy and Sell Stock II:
https://leetcode.com/problems/best-ti...
309. Best Time to Buy and Sell Stock with Cooldown:
https://leetcode.com/problems/best-ti...
714. Best Time to Buy and Sell Stock with Transaction Fee:
https://leetcode.com/problems/best-ti...
121. Best Time to Buy and Sell Stock:
https://leetcode.com/problems/best-ti...
123. Best Time to Buy and Sell Stock III:
https://leetcode.com/problems/best-ti...
188. Best Time to Buy and Sell Stock IV:
https://leetcode.com/problems/best-ti...

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Timestamps:
0:00 Introduction
1:02 Problem Discussion: Invariants & Constraints
3:54 Logic
9:55 Best Time to Buy and Sell Stock II
18:11 Website: Summary & Starting Spam Solving
18:28 Best Time to Buy and Sell Stock with Transaction Fee
19:46 Best Time to Buy and Sell Stock II with Cooldown
21:25 Transaction Modification
23:36 Best Time to Buy and Sell Stock I
25:20 Best Time to Buy and Sell Stock III
25:34 Best Time to Buy and Sell Stock IV
25:56 Discussion

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