求栈的最小值

#include<iostream>
#include<stack>
using namespace std;
#define MAX_DATA 10000000


template <class T>
class MyStack
{
    stack<T> s1; //s1数据栈
    stack<T> s2; //s2最小值栈
public:
    void Push(const T& x)
    {
        T min = Min();
        if (x < min)
        {
            s1.push(x);
            s2.push(x);
        }
        else
        {
            s1.push(x);
            s2.push(min);
        }
    }
    void Pop()
    {
        if (!s1.empty())
        {
            s1.pop();
            s2.pop();
        }

    }
    T Min()
    {
        if (s2.empty())
        {
            return MAX_DATA;
        }
        return s2.top();
    }
};

int main()
{
    MyStack<int> s;
    s.Push(5);
    s.Push(2);
    s.Push(3);
    s.Push(4);
    //s.Push(1);
    //s.Push(6);
    s.Pop();
    s.Pop();
    s.Pop();
    int min = s.Min();
    cout << "stack min = "<<min << endl;
    getchar();
    return 0;
}