Easy

用桶，很简单：

#include <iostream>
#include <string>
using namespace std;
int main (){
    int n;
    cin>>n;
    string temp;
    int a=0;
    int x[53]={0};
    for(int i = 1;i<=n;i++){
        cin>>temp;
        if(temp[0]=='C') a+=1;
        else if(temp[0]=='H') a+=2;
        else if(temp[0]=='D') a+=3;
        else if(temp[0]=='S') a+=0;

        if('1'<=temp[1] && temp[1]<='9') a+=4*(temp[1]-'0')-3;
        else if(temp[1] == 'T') a+=37;
        else if(temp[1] == 'J') a+=41;
        else if(temp[1] == 'Q') a+=45;
        else if(temp[1] == 'K') a+=49;
        else if(temp[1] == 'A') a+=1;
    
        x[a]++;
        a=0;
    }
    int sum=0;
    for(int i = 1;i<=52;i++){
        if(x[i]==0){
            sum++;
        }
    }
    cout<<sum;
    return 0;
}