C++ 代码
#include<iostream>
using namespace std;
int main(){
int n,x,cnt1=0,cnt2=0;
cin>>n;
for(int i=1;i<=n;i++){ //while(n--)
cin>>x;
if(x>=10&&x<=20) cnt1++;
else cnt2++;
}
cout<<cnt1<<" in"<<endl;
cout<<cnt2<<" out"<<endl;
return 0;
}