青蛙的约会
我的程序只有选择和顺序语句,怎么可能会超时???
#include <stdio.h>
#define un unsigned long

un dis=0,disv=0,a,b;
un t=0,k,m,n,x,y,L;
short f;

main()
{
FILE *fp;
fp=fopen("input.txt","r");
fscanf(fp,"%d %d %d %d %d",&a,&b,&m,&n,&L);
fclose(fp);
f=0;
if (m<n) {k=m;m=n;n=k;k=a;a=b;b=k;}
else if (m==n) 
     {if (a==b) f=1;else f=2;}
if (f==0)
   {
    disv=m-n;
    if (a<b) dis=b-a;
    else dis=L-a+b;
    k=dis/disv;
    if (dis==(k*disv)) {t=k;f=1;}
    else f=2;
	}
if (f==1) printf("%d\n",t);
else printf("Impossible\n");
}