# Technical Interview Techniques: Dynamic Programming

### Dynamic Programming Optimal Substructure

A problem has optimal substructure if its sub-problems have optimal solutions that constitute the problem’s optimal solution. This type of problem can be solved using dynamic programming.

### Dynamic Programming

Dynamic programming is a technique to optimize algorithms by breaking a problem with overlapping sub-problems into smaller sub-problems and then combining the solutions to the sub-problems to solve the larger problem.

### Dynamic Programming

Dynamic programming is both a mathematical optimization method and a computer programming method. It simplifies a complicated problem by breaking it down into simpler sub-problems.

It can be applied to combinatorial and optimization problems such as finding the shortest path between two points or finding the smallest set of objects that satisfies some criteria.

### Dynamic Programming Problem Variable

When solving a problem with dynamic programming, we maintain a dynamic set of variables corresponding to each sub-problem that changes in order to find the overall solution. These variables are called problem variables.