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CSES - Datatähti Open 2018 - NetworkCSES - Network
|Time limit:||1.00 s|
|Memory limit:||512 MB|
Syrjälä's network consists of $n$ computers and $n$ connections between them. At the moment it is possible to send a message between any two computers.
Your task is to calculate the number of essential
connections: if such a connection is removed from the network, it is not possible to send a message between some two computers.
The first input line contains an integer $n$: the number of computers. The computers are numbered $1,2,\ldots,n$.
After this, there are $n$ lines that describe the connections. Each line has two integers $a$ and $b$: there is a connection between computers $a$ and $b$.
There is at most one connection between two computers, and there are no connections from a computer to itself.
Print one integer: the number of essential connections.
Explanation: The essential connections are $(1,2)$, $(2,3)$, $(5,6)$ and $(6,7)$.
Subtask 1 (28 points)
Subtask 2 (72 points)