train.cpp

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#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;
 
 
struct Car {
    string id;
    Car *next;
};
 
void appendCar(Car *&head, string id);
void printTrain(Car *&head);
 
int main() {
    Car *head = NULL;
    int n;
    cin >> n;
    string id;
    for (int i = 0; i < n; i++) {
        cin >> id;
        appendCar(head, id);
    }
    printTrain(head);
 
    return 0;
}
 
// Please implement the function appendCar() here.
void appendCar(Car *&head, string id) {
    if (head == NULL) {
        head = new Car;
        head->id = id;
        head->next = NULL;
    } else {
        Car *current = head;
        while (current->next != NULL) {
            current = current->next;
        }
        current->next = new Car;
        current->next->id = id;
        current->next->next = NULL;
    }
}
 
void printTrain(Car *&head) {
    Car *current = head; (*current).next
    while (current != NULL) {
        if (current->next != NULL) {
            cout << current->id << ", ";
        }
        else {
            cout << current->id;
        }
        current = current->next;
    }
}