2-0.c

好东西,绝对是好东西,我向大家推荐

#include <stdio.h>
int N(int n)
{
	int i;long s=1;
	for(i=1;i<=n;i++)
	{s*=i;}	
	return(s);
}
int main()
{
	int i=0,j,a[80];long t1,t2,t3;
	//for(i=0;i<2;i+)
	scanf("%d %d",&a[i],&a[i+1]);
	while(a[i]!=0&&a[i+1]!=0)
	{
		i+=2;
		scanf("%d %d",&a[i],&a[i+1]);
	}
	for(j=0;j<=i-2;j+=2)
	{
		t1=N(a[j]);t2=N(a[j+1]);t3=N(a[j+1]-a[j]);
		printf("%d\n",t2/(t1*t3));
	}
	return(0);
}