C++ 代码
#include<iostream>
using namespace std;
int main(){
int n, x, insum = 0, outsum = 0;
scanf("%d", &n);
for (int i = 0; i < n; i++){
cin >> x;
if (x <= 20 && x >= 10) insum++;
else outsum++;
}
printf("%d in\n", insum);
printf("%d out\n", outsum);
return 0;
}