Given a linked list, you are asked to check if it contains a cycle.
TODO: Should we have a tutorial here?
TODO: Determine the input format
The initial data for the linked list is obtained automatically. You don’t need to do anything. It’s guaranteed that the size of the linked list does exceed and the values in the linked list don’t exceed in their absolute value.
The program should print Yes in case the linked list contains a cycle and No otherwise.