有必要这么麻烦？

#include<bits/stdc++.h>
using namespace std;
int b;
int main(){
	cin>>b;
	cout<<(b/10>=1&&b/10<10);
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=10&&a<=99) cout<<"1";
	else cout<<"0";
	return 0;
}