we use a stack and we'll use it's last in first out(LIFO) feature. We also keep a list of all the nodes we have visited since we have to visit each node only once. So
The implementation below uses the stack data-structure to build-up and return a set of vertices that are accessible within the subjects connected component. Using Python’s overloading of the subtraction operator to remove items from a set, we are able to add only the unvisited adjacent vertic...