There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a certain color is different. You have to paint all the houses such that no two adjacent houses have the same color.
The cost of painting each house with a certain color is represented by a
n x 3 cost matrix. For example,
costs is the cost of painting house 0 with color red;
costs is the cost of painting house 1 with color green, and so on... Find the minimum cost to paint all houses.
All costs are positive integers.