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第一次写匹配问题的程序,用的是bbs上的那个模板,不知主函数哪里错了,哪位高手看一下.#include<stdio.h>
#define MAX 130
int Bipartite(bool vc [][MAX],int nv1,int nv2) {
int i, j, x, n;
int q[MAX], prev[MAX], qs, qe;
int vm1[MAX], vm2[MAX];
n = 0;
for( i = 0; i < nv1; i++ ) vm1[i] = -1;
for( i = 0; i < nv2; i++ ) vm2[i] = -1;
for( i = 0; i < nv1; i++ ) {
for( j = 0; j < nv2; j++ ) prev[j] = -2;
qs = qe = 0;
for( j = 0; j < nv2; j++ ) if( vc[i][j] ) {
prev[j] = -1;
q[qe++] = j;
}
while( qs < qe ) {
x = q[qs];
if( vm2[x] == -1 ) break;
qs++;
for( j = 0; j < nv2; j++ ) if( prev[j] == -2 && vc[vm2[x]][j] ) {
prev[j] = x;
q[qe++] = j;
}
}
if( qs == qe ) continue;
while( prev[x] > -1 ) {
vm1[vm2[prev[x]]] = x;
vm2[x] = vm2[prev[x]];
x = prev[x];
}
vm2[x] = i;
vm1[i] = x;
n++;
}
return n;
}
int main()
{
bool vc[MAX][MAX]={false};
int ca,i,a,b,x,y;
scanf("%d",&ca);
while(ca--)
{
scanf("%d%d",&a,&b);
for(i=1;i<=b;i++)
{
scanf("%d%d",&x,&y);
vc[x-1][y-1]=true;//次两点存在联系,值变为1
}
printf("%d\n",a-Bipartite(vc,a,a));//总的点数减去最大匹配数
}
return 0;
}
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