why i still got WA "Problem 1061 Buffer Manager "
...or i misunderstand this prob?

#include <stdio.h>
#include <string.h>
#define MAX 100050
FILE *fp,*fx;
long num[MAX],star[MAX];
int main()
{
 long i,min,n,k,tmp,limit;
 char str[100];
 fp=stdin; fx=stdout;
// fp=fopen("1061.in","r");
// fx=fopen("1061.out","w");
  fscanf(fp,"%ld %ld\n",&n,&k);
  tmp=1;
  while(fscanf(fp,"%s",str)!=EOF)
   {
    limit=strlen(str);
    for(i=0;i<limit;i++,tmp++)
      { if(str[i]!='*')
      { num[tmp]=num[tmp-1]+str[i]-'0'; star[tmp]=star[tmp-
1]; }
    else
      { num[tmp]=num[tmp-1]; star[tmp]=star[tmp-1]+1; }
      }
   }
     min=2000000000;
  for(i=1;i+k-1<=n;i++)
   if( (num[i+k-1]-num[i-1]<min)&&(star[i+k-1]==star[i-1])) min=num
[i+k-1]-num[i-1];
  if(min!=2000000000) fprintf(fx,"%ld\n",min);
  else fprintf(fx,"0\n");
// fclose(fp);
// fclose(fx);
 return 0;
}