说程序未能猜出数字……

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstdio>
#include<cmath>
using namespace std;
int main(){
	int l=1,r=100000000,ans;
	while(1){
		int mid=(l+r)/2;
		cout<<mid<<endl;
		cin>>ans;
		if(ans==-1)
			l=mid+1;
		if(ans==1)
			r=mid-1;
		if(ans==0)
			return 0;
	}
	return 0;
}