LL 1. Question 1 A set of computers need to be connected using ethernet cables. Two computers are said to be connected if they have either a direct or indirect connection to each other via cables. An example of a direct connection would be a cable connecting computers 1 and 2. If computer 2 were then directly connected to computer 3, we would say that computers 1 and 3 are indirectly connected. A cable only connects two distinct computers. No two computers are connected by more than one cable. Initially, some groups of computers are connected to each other. If some groups of computers are disconnected, one operation may be performed: remove the cable between any to two computers and connect any other pair of computers with the cable. Determine the minimum number of operations to connect all the computers. Report -1 as the answer if it is not possible to connect all the computers.
