折半查找程序，输入后就崩溃，谁能帮忙看一下

#include
#include
using namespace std;
int half(int,vector );
int low=0;
int high=7;
int main(){
int b[10]={1,10,15,17,18,21,22,35,54,65};
vector a(b,b+10);
cout<<"请输入要査找的数：";
int number;
cin>>number;
if(half(number,a)){
cout<<"ok";
}
return 0;
}

int half(int number,vector <int> a){
    int mid=(high-low)/2;
    if(number>a[mid]){
        a[low]=a[mid+1];
        half(number,a); 
    }
    else if(number<a[mid]){
        a[high]=a[mid-1];
        half(number,a);
    }
    else if (number==a[mid]){           
        return 1;
    }       
}

a[high]=a[mid-1]，这样做完全没有意义吧。应该是high=mid-1，对于low也是low=mid+1

half函数可能没有返回值，前两个if，else应加上return语句