[Uva 11825] Hackers’ Crackdown
Hackers’ Crackdown
Input: Standard Input
Output: Standard Output
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 finds 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, find the maximum number of services that the hacker can damage.
Input
There will be multiple test cases in the input file. 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 - 1. Each of the following N lines describes the neighbors of a node. Line i (0<=i<N) represents the description of node i. The description for node i starts with an integer m (Number of neighbors for node i), followed by m integers in the range of 0 to N - 1, each denoting a neighboring node of node i.
The end of input will be denoted by a case with N = 0. This case should not be processed.
Output
For each test case, print a line in the format, “Case X: Y”, where X is the case number & Y is the maximum possible number of services that can be damaged.
Sample Input
1 3 6 7
1 7 5 4 8 3 9
1 4 3 5 6 2 8 9
Sample Output
Case 1: 3
Case 2: 2
状压DP、枚举子集
#include <iostream>
#include <cstring>
#include <cstdio>
using namespace std;
#define N (1<<16)+10 int n;
int p[];
int cover[N];
int dp[N]; int main()
{
int i,j,k,iCase=;
while(scanf("%d",&n),n)
{
for(i=;i<n;i++)
{
int m,x;
p[i]=<<i;
scanf("%d",&m);
while(m--)
{
scanf("%d",&x);
p[i]|=(<<x);
}
}
int MAX=<<n;
for(j=;j<MAX;j++)
{
cover[j]=;
for(i=;i<n;i++)
{
if(j&(<<i)) cover[j]|=p[i];
}
}
for(j=;j<MAX;j++) //枚举集合j
{
dp[j]=;
for(k=j;k;k=(k-)&j) //枚举子集k
{
if(cover[k]==MAX-) dp[j]=max(dp[j],dp[j^k]+);
}
}
printf("Case %d: %d\n",iCase++,dp[MAX-]);
}
return ;
}
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