Question

In BFS, how many times is a node visited?

I’m a bit unsure about how many times a node is visited in BFS. Is each node visited only once, or could it be revisited if there are multiple paths leading to it? Could someone explain how BFS handles this?

Answer 1

In Breadth-First Search (BFS), each node is visited equivalent to number of indegree of the node. In BFS, we have to see whether the node is visited or not by it’s ancestor. If it is visited, we won’t let it enter it in the queue.