C++ 代码

#include<cstdio>
#include<iostream>

using namespace std;

int main(void)
{
    int n,i,x;
    int in = 0,out = 0;
    cin >> n;
    for(i=1;i<=n;i++)
    {
        scanf("%d",&x);
        if(x>=10&&x<=20) in++;
        else out++;
    }
    printf("%d in\n%d out\n",in,out);
    return 0;
}