#include <iostream>#include <stack>using std::stack;class MinStack {public:    stack<int> st;    stack<int> stm;    void push(int x)     {        st.push(x);        if(stm.empty() || stm.top()>=x)        {            stm.push(x);        }    }    void pop()     {        int topElem = st.top();        st.pop();        if(topElem <= stm.top())        {            stm.pop();        }    }    int top()     {        return st.top();    }    int getMin()     {        return stm.top();    }};