# Dynamic Programming

Dynamic programming is a method for solving problems of recursive nature, iteratively and is applicable when the computations of the subproblems overlap.

Dynamic programming is usually implemented using tabulation, but can also be implemented using memoization.

Tabulation is a bottom-up approach of solving a problem. First all sub-problems are solved by filling up an n-dimensional table. Then, based on the results in the table, the final solution is provided as an aggregation of the solutions for the sub-problems.

If all subproblems must be solved at least once, a bottom-up dynamic-programming algorithm usually outperforms a top-down memoized algorithm by a constant factor.

If some subproblems in the subproblem space need not be solved at all, the memoized solution has the advantage of solving only those subproblems that are definitely required

A problem solvable by memoization will be solvable by dynamic programming, but a problem solvable by dynamic programming might not be solvable by memoization.