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hard Solve on LeetCode

Last edited: August 2, 2025

Problem
Examples
Solution
Method 1 - Recursion
Code
Method 2 - Top Down DP with Memoization
Code
Method 3 - DP
Code
Complexity
Method 4 - Optimized DP
Code
Code
Complexity
Method 5 - 1D Dynamic Programming
Code
Complexity
Method 6 - DP with State Machine
Code
Complexity
Method 7 - Using State Machine and Recursion + Memo
Code
Method 8 - State Machine and DP Tabulation
Code

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