#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a[3], num = 0, sum = 0;
    for (int i = 0; i < 3; i++)
    {
        cin >> a[i];
    }
    for (int i = 0; i < 3; i++)
    {
        if (a[i] >= 10 && a[i] <= 20)
        {
            num++;
            sum += a[i];
        }
    }
    cout << num << " " << sum;
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int a[5], num, sum;
int main()
{
    for (int i = 1; i <= 3; i++)
    {
        cin >> a[i];
        if (10 <= a[i] && a[i] <= 20)
        {
            sum += a[i];
            num += 1;
        }
    }
    cout << num << " " << sum;
    return 0;
}

最简（吧）

#include<bits/stdc++.h>
using namespace std;
int x,ans,num;
int main()
{
    for (int i=1;i<=3;i++)
    {
        cin>>x;
        if (x>=10&&x<=20)
            ans+=x,num++;
    }
    cout<<num<<" "<<ans;
    return 0;
}