思路:
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栈s1和栈s2,s1用来Push数据,s2用来Pop数据
入队:数据直接压入栈s1中
出队:若s2为空,则把s1中除过最后一个压入的元素全部移入s2中,然后弹出s1的栈顶元素
若s2不为空,直接弹出s2的栈顶元素
#define _CRT_SECURE_NO_WARNINGS 1
#include
#include
#include
using namespace std;
template
class Queue
{
public:
Queue()
{
//利用库里面的stack的构造函构造s1和s2
}
Queue( const Queue & que)
{
s1 = que.s1;
s2 = que.s2;
}
~Queue()
{
//利用stack类来完成s1和s2的释放
}
void Push(const T&t)
{
s1.push( t);
}
void Pop()
{
assert(s1.size() != 0 || s2.size() != 0);
if (s2.size() == 0)
{////把s1中除了栈底元素,其他全部push进s2中
while (s1.size() != 1)
{
s2.push(s1.top());
s1.pop();
}
s1.pop();
}
else
{
s2.pop();
}
}
T& Front() //读取队列的队首元素
{
assert(s1.size() != 0 || s2.size() != 0);
if (s2.size() != 0)
{
return s2.top();
}
else
{
while (s1.size() != 1)
{
s2.push(s1.top());
s1.pop();
}
return s1.top();
}
}
T& Back() //读取队列的队尾元素
{
assert(s1.size() != 0 || s2.size() != 0);
if (s1.size() != 0)
{
return s1.top();
}
else
{
while (s2.size() != 1)
{
s1.push(s2.top());
s2.pop();
}
return s2.top();
}
}
bool Empty() //判断空
{
if (s2.size() == 0 && s2.size() == 0)
{
return true ;
}
else
{
return false ;
}
}
size_t Size()
{
return s1.size() + s2.size();
}
template
friend ostream &operator<<(ostream& _cout, const Queue
private:
stack
stack
};
template
ostream& operator<<(ostream &_cout, const Queue
{
Queue
_cout << "Queue:" ;
while (coutque.s2.size() > 0)
{
_cout << coutque.s2.top() << " ";
coutque.s2.pop();
}
while (coutque.s1.size() > 0)
{
coutque.s2.push(coutque.s1.top());
coutque.s1.pop();
}
while (coutque.s2.size() > 0)
{
_cout << coutque.s2.top() << " ";
coutque.s2.pop();
}
_cout << " " ;
return _cout ;
}
void Test()
{
Queue
que.Push(1);
que.Push(2);
que.Push(3);
que.Push(4);
que.Push(1);
que.Push(2);
que.Push(3);
que.Push(4);
cout << que << endl;
/*que.Pop();
que.Pop();
que.Pop();
cout << que << endl;*/
/*int head1=que.Front();
cout << head1< que.Pop(); int head2 = que.Front(); cout << head2< /*int tail1 = que.Back(); cout << tail1 << endl;*/ int ret=que.Size(); cout << ret << endl; } int main() { Test(); return 0; }
文章名称:用两个栈实现一个队列
文章起源:http://njwzjz.com/article/pdhpgo.html