#include <iostream>
using namespace std;
int main(){
	int l,r;
	l=1;
	r=1000000000;
	int m=(l+r)/2;
	int ans=1;
	while(ans!=0&&l<=r){
		std::cout<<m<<endl;
		std::cin>>ans;
		if(ans==-1){
			l=m+1;
		}
		if(ans==1){
			r=m-1;
		}
		if(ans==0)return 0;
		m=(l+r)/2;
	}
	return 0;
}

返回信息： Wrong Answer. wrong output format Unexpected end of file - int32 expected

然后全wa了