C++ Interview Questions and Answers


How do you find out if a linked-list has an end? (i.e. the list is not a cycle)

You can find out by using 2 pointers. One of them goes 2 nodes each time. The second
one goes at 1 nodes each time. If there is a cycle, the one that goes 2 nodes each
time will eventually meet the one that goes slower. If that is the case, then you
will know the linked-list is a cycle.

Posted by:Richards