模版类建立单项链表，oj上说使用了系统禁止的操作系统调用，有人知道原因吗

Question

#include<iostream>
using namespace std;
template<typename T>
class List
{
public:
    T t;
    List<T>* pt;
    void output()
    {
        cout << t << endl;
    }
    List(T x)
    {
        t = x;
    }
};
int main()
{
    int n;
    cin >> n;
        List<int>* head = NULL;
        List<int>* p;
        List<int>* pp;
        int data = 0;
        cin >> data;
        head = new List<int>(data);
        pp = head;
        for (int i = 1; i < n; i++)
        {
                cin >> data;
                p = new List<int>(data);
                pp->pt = p;
                pp = p;
        }
        pp->pt = NULL;
        
    for (int i = 0; i < n; i++)
    {
        head->output();
         head=head->pt;
    }
    system("pause");
    return 0;
}

- 

``

Answer 1

system("pause"); 提交的时候这句注释掉