dl快来看看

#include<bits/stdc++.h>
using namespace std;
int BinaryofSearch(int a[],int len,int key)
{
	int low=0;
	int high=len-1;
	int mid;
	while(low<high)
	{
		mid=(low+high)/2;
		if(key==a[mid])
		{
			return mid;
		}
		if(key<=a[mid])
		{
			high=mid-1;
		}
		if(key>a[mid])
		{
			low=mid+1;
		}
	}
	 return -1;
}
int main()
{
	BinaryofSearch()//不会用了
   	return 0;
}