Uva11825 - Hackers' Crackdown

Miracle Corporations has a number of system services running in a distributed computer system which
is a prime target for hackers. The system is basically a set of N computer nodes with each of them
running a set of N services. Note that, the set of services running on every node is same everywhere
in the network. A hacker can destroy a service by running a specialized exploit for that service in all
the nodes.
One day, a smart hacker collects necessary exploits for all these N services and launches an attack
on the system. He nds a security hole that gives him just enough time to run a single exploit in each
computer. These exploits have the characteristic that, its successfully infects the computer where it
was originally run and all the neighbor computers of that node.
Given a network description, nd the maximum number of services that the hacker can damage.
Input
There will be multiple test cases in the input le. A test case begins with an integer N (1  N  16),
the number of nodes in the network. The nodes are denoted by 0 to N

0 0

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