#include<stdio.h>
void main()
{
    int num[15]={12,13,14,15,16,17,18,19,20,21,22,23,24,25,26};
    int n,min=0,max=14,mid,temp;
    scanf("%d",&n);
    mid=(max+min)/2+1;
    while(min<=max)
    {
         if(num[max]==n)
         {
             temp=max;
             break;
         }
         else if(num[min]==n)
         {
             temp=min;
             break;
         }
         else if(num[mid]==n)
         {
             temp=mid;
             break;
         }
         else if(num[mid]>n)
        {
                 max=mid-1;
                 break;
        }
        else if(num[mid]<n)
        {
            min=mid+1;
            break;
        }
        
    }
    printf("%d\n",temp+1);

}

没有啊，输入12，26的时候还是正常输出值的