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where is wrong?#include<stdio.h>
main()
{
int s[20],t[20];
int dis=0,num=0,i=1;
t[0]=0;
scanf ("%d",&num);
while(num!=-1);
{
for(;i<=num;)
{
scanf("%d%d",&s[i],&t[i]);
i++;
}
for(;i>=1;)
{dis+=s[i]*(t[i]-t[i-1]);
i--;}
printf ("%d miles",dis);
scanf("%d",&num);
}
return 0;
}
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