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哪里出问题了,帮帮忙呀,我实在是找不出来啦!!!!!

Posted by 00430030 at 2005-01-10 16:20:37 on Problem 2017
#include<stdio.h>
#include<math.h>
void main ()
{
    int  n,a[20],b[20],i,sum=0,j;
	for(;;)	
{	scanf("%d",&n);
    if(n==-1)  goto end;    
	for(i=0;i<n;i++)
			scanf("%d %d",&a[i],&b[i]);
	
		if(n==1)  printf("%d miles\n",a[0]*b[0]);
		else  
{       sum=0;
		for(j=1;j<n;j++)    
		sum=sum+a[0]*b[0]+a[j]*(b[j]-b[j-1]);
		printf("%d miles\n",sum);
	}
end:;
}
}

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