How do i take input?

#1

How do i take input for this question. I cant manually make a cicruclar list.

#2

Say If INPUT IS 1 2 3 4 5 2 3 -1
form a linked list 1->2->3->4>5 then you see that 2 has already been visited , so connect the next pointer of 5 to 2. This way you have created the circular linked list .So for this you can maintain a map or a visited array…whenever you see that a node is already visited, connect next pointer of previous node to that node.
After that just detect the cycle , remove the cycle, print the new linked list.
You can also refer this:
You can refer this:

#3

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