Constraint satisfaction problem

## Problem 2 - CSP

Consider the following constraint satisfaction problem. A linear graph has nodes of the following colors:

- Red

- Yellow

- Green

- Blue

- Violet

Each node has a domain of {1, 2, ..., 9}.

Each node type has the following constraints on its value:

- Red - No contraints

- Yellow - equals the rightmost digit of of the product of all its neighbors

- Green - equals the rightmost digit of the sum of all its neighbors 

- Blue - equals the leftmost digit of the sum of all its neighbors

- Violet - equals the leftmost digit of the product of all of its neighbors

As a reminder here is the pseudo code for the Min-Conflicts search algorithm:


**Notes:**

- It's possible that you won't converge to a solution in a single run. Try a few runs to see if you get to a solution.

- The example is to show you what a problem looks like, we will test/grade your program on different examples

Complete the function *solve_csp* defined below. You may find some helper functions useful.