extern "C" int Seniorious(int);
extern "C" int Chtholly(int n,int c)
{
	int l=1,r=n;
	int mid=(l+r)/2;
	while(Seniorious(mid)!=0)
	{
		mid=(l+r)/2;
		if (Seniorious(mid)==1) r=mid-1;
		if (Seniorious(mid)==-1) l=mid+1;
		if (Seniorious(mid)==0) return mid;
	}
}

感觉没什么问题，为什么只有三十分？