则把第一个栈中的数据全部压入第二个栈(第一个栈此时为空)。
实际写代码时注意栈为空的情况。
代码:
#include <iostream>
#include <stack>
class Queue
{
public:
Queue() {}
~Queue() {}
void push(int vData)
{
m_First.push(vData);
}
void pop()
{
if (m_Second.empty())
{
if (m_First.empty())
{
std::cout << "the queue is empty" << std::endl;
return ;
}
move(m_First, m_Second);
m_Second.pop();
}
}
int top()
{
if (m_Second.empty())
{
if (m_First.empty())
{
std::cout << "the queue is empty" << std::endl;
return ;
}
move(m_First, m_Second);
}
return m_Second.top();
}
int back()
{
if (m_First.empty())
{
if (m_Second.empty())
{
std::cout << "the queue is empty" << std::endl;
return ;
}
move(m_Second, m_First);
}
return m_First.top();
}
private:
void move(std::stack<int>& vL, std::stack<int>& vR)
{
while (!vL.empty())
{
vR.push(vL.top());
vL.pop();
}
}
private:
std::stack<int> m_First;
std::stack<int> m_Second;
};
原文地址:http://blog.csdn.net/xiaoliangsky/article/details/38859647