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有一小子非说他的程序没错,要起诉北大.我觉得他挺可怜的,但我也找不出错.哪位大哥来帮看看.(C语言)

Posted by 20054959 at 2007-01-16 21:09:55 on Problem 1061
#include<stdio.h>
#include<math.h>
void main()
{
unsigned long x,y,m,n,L,s,s1,t=0,v;
scanf("%ld%ld%ld%ld%ld",&x,&y,&m,&n,&L);
if(m==n)
	printf("Impossible\n");
else 
	{
	if((x-y)*(m-n)<0)
		s=abs(x-y);
	else
		s=L-abs(x-y);
	x=s;
	v=abs(m-n);
	while(1)
		{
		s1=s%v;
		t=s/v+t;
		if(s1==0)
			{
			printf("%ld\n",t);
			break;
			}
		if((s1+L-x)%v==0)
			{
			printf("Impossible\n");
			break;
			}
		s=s1+L;
		}
	} 
}

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