poj 1422 java 二分匹配
推荐java学习室http://www.java3z.com/cwbwebhome/
旧题新做,练java用
View Code
import java.io.*;
import java.util.*;
import java.math.*;
public class Main{
static int n,m,match[]=new int[210];
static boolean mat[][]=new boolean [210][210],v[]=new boolean[210];
static boolean dfs(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||dfs(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(dfs(i)) ret++;
}
return ret;
}
public static void main(String args[]){
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());
}
}
}