程序代码：

#include <stdio.h>
#include <string.h>

int main()
{ 
  int a[10]={8,9,6,4,7,5,3,2,1,5},i,low,high,mid,count=0,n;
  scanf("%d",&n);
  
  low=0; high=10-1; 
  
  while(low<=high)
  {
      mid=(high+low)/2;
      
      if(n<a[mid]) high=mid-1;
      else if(n>a[mid]) low=mid+1;
           else if(a[mid]==n) 
           {
             printf("success!a[%d]=%d\n",mid,n);
           count++;
           break;    
         }
  }
  if(count==0) printf("shibai");
  
  return 0;
}