I have pointer to circular doubly linked list with random values of 0 or 1.
I have a single pointer to the first item of the list. I need to find the length of the list without to create any additional pointers.
In addition, I can change the values of each node between 0 to 1 or 1 to 0.
I thought about
Josephus Circle algorithm - with no success.
My main problem is that I don't even know what end of a circle/circular list is.
If you think about that, you will understand it is not an easy question.