我承认我是个……

#include <iostream>
using namespace std;
bool fl[200][200];
char a[] = {'D', 'C', 'H', 'S'},
        b[] = {'A', '2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K'};
int main()
{
    int n;
    cin >> n;
    while (n--)
    {
        char c, x;
        cin >> c >> x;
        fl[int(c)][int(x)] = 1;
    }
    int cnt = 0;
    for (int i = 0; i <= 3; i++)
            for (int j  = 0; j <= 12; j++)
                if (!fl[int(a[i])][int(b[j])])cnt++;
    cout << cnt;
    return 0;
}