题目传送门

不知为何会TLE，求大佬指点！！！

代码如下：

#include<iostream>
#define ll long long
using namespace std;
ll in = 10, r = 0, l = 1e9+10, mi;
inline void work(){
	while (in != 0) {
		mi = (l + r) / 2;
		cout << mi << endl;
		cin >> in;
		if (in == 0) exit(0);
		else
			if (in == 1) l = mi + 1;
		else r = mi - 1;
	}
}
int main() {
	ios::sync_with_stdio(false);
	work();
	return 0;
}