代码如下

#include<iostream>
#include<cstdio>
using namespace std;
int main() {
	for (long long l = 1, r = 1000000000; l != r;) {
		int mid = (l + r) / 2;
	    std::cout << mid << std::endl;
		int in;
		cin >> in;
		if (in == 1) {
			r = mid - 1;
		}
		else if (in == -1) {
			l = mid + 1;
		}
		else if (in == 0) {
			return 0;
		}
	}
}

不明白为什么二分都会TLE