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跪求人帮我看看我的代码为什么总是WA,如果能cha组数据也同样感谢#include <stdio.h>
#include <algorithm>
using namespace std;
int a[30010];
struct node
{
int x;
int fa;
}shu[30010];
int main()
{
int i,j,n,m,t,x,sum;
while(scanf("%d%d",&n,&m),!(n==0&&m==0))
{
if(n==0)
{
printf("0\n");
continue;
}
sum=0;
for(i=0;i<n;i++)
{
shu[i].x=i;
shu[i].fa=i;
}
for(i=0;i<m;i++)
{
scanf("%d",&t);
for(j=0;j<t;j++)
{
scanf("%d",&a[j]);
}
sort(a,a+t);
for(j=0;j<t;j++)
{
shu[a[j]].x=a[j];
if(shu[a[j]].fa>=a[0])
shu[a[j]].fa=a[0];
}
}
for(i=0;i<n;i++)
{
j=i;
while(shu[j].fa!=shu[j].x)
{
j=shu[j].fa;
}
if(j==0)
sum++;
}
printf("%d\n",sum);
}
return 0;
}
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