#include<stdio.h>
int main()
{
	int i,j,k,cas,num;
	long m,n,l;
	cas=0;
	while(1)
	{
		scanf("%ld%ld",&n,&m);
		cas++;
		if(n==0&&m==0)break;
		int a[50001]={0};
		num=0;
		for(l=1;l<=m;l++)
		{
			scanf("%d%d",&i,&j);
			if(a[i]==0&&a[j]==0)
			{
				num++;
				
			}
		 
		  	a[i]=1;  a[j]=1;
			
		}
		for(i=1;i<=n;i++)if(a[i]==0)num++;
        printf("Case %d: %d\n",cas,num);
	}
	return 0;
}

• Re:why I am wa (797) scauben0 2005-11-01 18:06:18