具体要求如下，求解？🙏

#include <iostream>
using namespace std;
#define N 20

void test01() {
    int arr[N][3];
    int n;
    int gold_num = 0,silver_num = 0,copper_num = 0;
    int sum = 0;
    cin>>n;
    for(int i = 0; i<n; i++) {
        for(int j = 0; j<3; j++) {
            cin>>arr[i][j];
            sum += arr[i][j];
            if(j == 0) {
                gold_num += arr[i][j];
            } else if(j == 1) {
                silver_num += arr[i][j];
            } else if(j == 2) {
                copper_num += arr[i][j];
            }
        }
    }
    cout<<gold_num<<' '<<silver_num<<' '<<copper_num<<' '<<sum;
}
int main() {
    test01();
    return 0;
}

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