Dynamic Programming

Summary

Solving complex problems by breaking them into overlapping subproblems, solving each once, and reusing the cached results — arguably the hardest, most feared interview topic.

• 1Start with classic DP problems: climbing stairs, coin change, longest common subsequence.
• 2Practice both memoization (top-down) and tabulation (bottom-up) for the same problem.
• 3Learn to first write the brute-force recursive solution, then optimize with a cache.