Circular linked list pronblem

#1

i cant understand the way the input is given
eg in the given input:
1 2 3 4 5 2 3 -1
so here how i can i implement the logic that it is looping at 2 i ahve comfusion because next node data 3 is also given
but in circular LL the next node of last node is the first node only here it is different please help.

#2

please refer to the circular linked list tutorial provided in the course

#3

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