class MinStack {
public:
    /** initialize your data structure here. * /
    vector<int> a;
    vector<int> min;
    MinStack() {
        min.push_back(2147483647);
    }

    void push(int x) {
        a.push_back(x);
        if(x<min.back())
        {
            min.push_back(x);
        }
        else
        {
            min.push_back(min.back());
        }

    }

    void pop() {
        a.pop_back();
        min.pop_back();

    }

    int top() {
        return a.back();

    }

    int getMin() {
        return min.back();

    }
};

/**
 * Your MinStack object will be instantiated and called as such:
 * MinStack* obj = new MinStack();
 * obj->push(x);
 * obj->pop();
 * int param_3 = obj->top();
 * int param_4 = obj->getMin();
 */