#include<iostream.h>
#include<stdio.h>
#include<math.h>
int main()
{
	long i,j,k,l,t,n,s;
	int a[110];
	double pi;
	while(cin>>n,n!=0)
	{
		k=0;s=0;
		for(i=0;i<100;i++)
			a[i]=0;
		for(i=1;i<=n;i++)
		{
			cin>>a[i];
			if ((a[i]==1)||(a[i]==0)) {i--;n--;}
		}
		for(i=1;i<=n-1;i++)
			for(j=i+1;j<=n;j++)
			{
				t=1;
				for(l=2;l<=a[i];l++)
					if ((a[i]%l==0)&&(a[j]%l==0)) {t=l;break;}
				if (t==1) k++;
			}
		s=n*(n-1)/2;
		if (k!=0) {pi=sqrt(6*s/k);printf("%1.6lf\n",pi);}
		else cout<<"No estimate for this data set."<<endl;
	}
	return 0;
}

• Re:if ((a[i]==1)||(a[i]==0)) {i--;n--;}这里错了,1和任意数都互质,后面也得改一改 (0) fxlbest 2005-11-15 19:22:18