Question 1

What is the difference between memoization and tabulation?

Accepted Answer

Memoization is a top-down approach where you solve the problem recursively and store the results of subproblems in a cache. Tabulation is a bottom-up approach where you solve the problem iteratively and fill a table with the results of subproblems.

Question 2

How do you identify a dynamic programming problem?

Accepted Answer

Dynamic programming problems typically exhibit two properties: optimal substructure (the optimal solution can be constructed from optimal solutions of its subproblems) and overlapping subproblems (the same subproblems are solved multiple times).

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