http://poj.org/problem?id=1422 //* @author: import java.io.*; import java.util.*; import java.math.*; public class Main { static int n,m,match[]=new int[201]; static boolean mat[][]=new boolean[201][201],v[]=new boolean[201]; static boolean findmatch(int pre) { int i; for(i=0;i< m;i++) { if(mat[pre][i]&&!v[i]) { v[i]=true; int buf=match[i]; match[i]=pre; if(buf==-1||findmatch(buf))return true; match[i]=buf; } } return false; } static int bmatch() { int ret=0,i; for(i=0;i< n;i++) { Arrays.fill(v, false); if(findmatch(i))ret++; } return ret; } public static void main(String args[]) throws Exception { Scanner cin=new Scanner(System.in); int t=cin.nextInt(),k,a,b; while(t-->0) { m=n=cin.nextInt(); int i,j; for(i=0;i< n;i++) for(j=0;j< n;j++)mat[i][j]=false; k=cin.nextInt(); while(k-->0) { a=cin.nextInt(); b=cin.nextInt(); a--; b--; mat[a][b]=true; } Arrays.fill(match, -1); System.out.println(n-bmatch()); } } }
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