就我是用循环写的吗

真题解

#include <bits/stdc++.h>
using namespace std;
bool a[4][20];
char xx[4] = {'D','C','H','S'};
char yy[13] = {'A','2','3','4','5','6','7','8','9','T','J','Q','K'};
int num;
int main() {
	int n;
    cin >> n;
    for(int i=1;i<=n;i++){
    	string s;
        cin >> s;
        for(int i=0;i<4;i++){
        	for(int j=0;j<13;j++){
            	if(s[0]==xx[i]&&s[1]==yy[j]){
                	a[i][j] = 1;
                }
            }
        }
    }
    for(int i=0;i<4;i++){
        for(int j=0;j<13;j++){
            if(!a[i][j]){
            	num++;
            }
        }
    }
    cout << num;
	return 0;
}