【数据结构】栈以及两个栈实现一个队列

栈以及两个栈实现一个队列

//数组版动态增长的栈

#pragma once


template <class T>
class stack
{   
public :
    stack()
         :_top(NULL),_base(NULL),_size(0),_capacity(0)
    {}
     void PushStack(const T& x)
    {
          //判断栈是否已满
          //插入
          if(_size == _capacity)
         {
             _capacity = _capacity * 2 + 10;
             T* tmp = new T[_capacity];
             memcpy(tmp,_base,sizeof(T)*_size);
              delete []_base;
             _base = tmp;
             _top = _base + _size - 1;
         }
         
         _top = _base +_size;
         *_top = x;
         _size++;

    }
     void PopStack()
    {
          //空
          //一个
          //两个及以上
          if(_base == NULL)
         {
             cout<< "该栈为空"<<endl;
         }
          else if (_base == _top)
         {
             _top--;
              //_base = ;
             _size = 0;
        }
          else
         {
             _top--;
             _size--;
         }
    }
    T GetTop()
    {
          return *_top;
    }
     int GetSize()
    {
          return _size;
    }

     bool Empty()
    {
          if(_size == 0)
              return true ;

          else
              return false ;
    }

    

    
private :
    T* _top;
    T* _base;
     int _size;
     int _capacity;
};

//两个栈实现一个队列
template <class T>

class stackqueue
{
public :
     void push(const T& x)
    {
        noemptyqueue.PushStack (x);
    }
     void pop()
    {
          while(noemptyqueue.GetSize ())
         {
             emptyqueue.PushStack (noemptyqueue.GetTop ());
             noemptyqueue.PopStack ();
         }
         emptyqueue.PopStack ();
          while(emptyqueue.GetSize ())
         {
             noemptyqueue.PushStack (emptyqueue.GetTop ());
             emptyqueue.PopStack ();
         }
    }
private :
    stack<T> emptyqueue;
    stack<T> noemptyqueue;
};