A graph is said to be connected if every pair of vertices in the graph is connected. This means that there is a path between every pair of vertices. An undirected graph that is not connected is called disconnected.

How do you check if an undirected graph is connected in Python?

A simple solution is to perform Depth–first search (DFS) or Breadth–first search (BFS) starting from every vertex in the graph. If each DFS/BFS call visits every other vertex in the graph, then the graph is strongly connected. The algorithm can be implemented as follows in C++, Java, and Python: C++

How do you know if a graph is connected?

Graph Connectivity: If each vertex of a graph is connected to one or multiple vertices then the graph is called a Connected graph whereas if there exists even one vertex which is not connected to any vertex of the graph then it is called Disconnect or not connected graph.