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int BinSearch(int arr[],int len,int key) //折半查找法（二分法）
{
int low=0; //定义初始最小
int high=len-1; //定义初始最大
int mid; //定义中间值
while(low<=high)
{
mid=(low+high)/2; //找中间值
if(key==arr[mid]) //判断min与key是否相等
return mid;
if(key>arr[mid]) //如果key>mid 则新区间为[mid+1,high]
low=mid+1;
else //如果key<mid 则新区间为[low,mid-1]
high=mid-1;
}
return -1; //如果数组中无目标值key，则返回 -1 ；
}
int main()
{
int arr2[100];
int n;
int i = 0;
n = getint();
while(i<n){
arr2[i] = getint();
i = i + 1;
}
n = BinSearch(arr2,n,9);
putint(n);
return 0;
}
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