Write a C++ program + explanation AND comments.

C++, and Comments Please.

Thank you.

Problem 1 (25 points) Imagine a robot sitting on the upper left corner of grid with r rows and c columns. The robot can only move in two directions, right and down, but certain cells are "off limits" such that the robot cannot step on them. Design an algorithm to find a path for the robot from the top left to the bottom right