OJ Board

I think the given graph can be disconnected !! :D
My code handled that and got AC.

try this case :

input:
7
1 2 3
2 3
5 6
6 7
0
0

output :
2


I don't think so. My accepted code gives the output 1.
Because the the graph has two subgraph, in which only 6 is the articulation point. If anyone ...

Getting WA , don't know why.
please give me some critical inputs or help me to find the bugs.

Thank you Sazzad vai.
I have got it.
But i have a confusion.
What is relation between my input taking procedure and RE.

I can't understand , why my code get RE.
It's a very simple code.
please help me.