/** Initialize your data structure here. */
/** Push element x onto stack. */
/** Removes the element on top of the stack and returns that element. */
//cout<<a.size()<< "+"<<b.size()<<endl;
/** Get the top element. */
/** Returns whether the stack is empty. */
return a.empty() && b.empty() ;
* Your MyStack object will be instantiated and called as such:
* MyStack* obj = new MyStack();
* int param_2 = obj->pop();
* int param_3 = obj->top();
* bool param_4 = obj->empty();