只有10pts

#include<bits/stdc++.h>
using namespace std;
extern "C" int Seniorious(int);
extern "C" int Chtholly(int n,int c){
	int l=1,r=n,mid;
	while(l <= r){
		mid = (l+r)/2;
		int k = Seniorious(mid);
		if(k == 1)l = mid+1;
		if(k == -1)r = mid-1;
		if(k == 0)return mid;
	}
	return l;
}

有一篇和我的很类似，是这样的，却能AC

extern "C" int Seniorious(int);

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

到底为啥啊