## LeetCode 232classMyQueue:def__init__(self):self.l1=[]## queue1 = l1self.l2=[]## queue2 = l2defpush(self,x:int)->None:## Push x onto stackself.l1.append(x)## The right of the list = the top of the stack = the back of the queuedefpop(self)->int:## pop 抽取## ...
importjava.util.NoSuchElementException;importjava.util.LinkedList;importjava.util.Queue;classMyStack{/** * The main queue using to store all the elements in the stack */privateQueue<Integer> q1;/** * The auxiliary queue using to implement `pop` operation */privateQueue<Integer> q2;/** * ...
returnqueue1.empty() && queue2.empty(); } }; 其他解法: 【两个队列】用两个队列myStack,temp实现一个栈。push时把新元素添加到myStack的队尾。pop时把myStack中除最后一个元素外逐个添加到myStack中,然后pop掉myStack中的最后一个元素,然后注意记得myStack和temp,以保证我们添加元素时始终向temp中添加。
while(!queue2.isEmpty()){ top = queue2.poll(); queue1.offer(top); } }else{ while(!queue1.isEmpty()){ top = queue1.poll(); queue2.offer(top); } } return top; } /** Returns whether the stack is empty. */ public boolean empty() { return queue1.isEmpty() && queue2.isE...
empty() -- Return whether the stack is empty. Notes: You must use only standard operations of a queue -- which means only push to back , peek/pop from front , size , and is empty Depending on your language, queue may not be supported natively. You may simulate a queue by using a...
class MyStack { public: /** Initialize your data structure here. */ MyStack() { } /** Push element x onto stack. */ void push(int x) { queue<int> que; while(!m_stk.empty()) { que.push(m_stk.front()); m_stk.pop(); ...
(self):"""Initialize your data structure here."""# 声明两个队列,由于模拟栈self.queue1 = deque()self.queue2 = deque()# self._empty指向当前空的队列self._empty = self.queue1# self._filled指向当前有填充的队列self._filled = self.queue2def push(self, x):"""Push element x onto stack....
特别地,之前我们讨论过用队列实现栈:王几行xing:【Python-转码刷题】LeetCode 225E - 用队列实现栈 Implement Stack Using Queues。 在开始这个题目之前,咱们来问个有意思的问题:Python 的 list,相当于哪种数据结构,Stack、Queue or Hash table? 答:最像的是栈,因为append()后进,pop()先出。但是结合pop[0]...
}// Return whether the stack is empty.boolempty(){returnq1.empty() && q2.empty(); }private: queue<int> q1; queue<int> q2;voidtoQ1(queue<int>& q1, queue<int>& q2){if(q1.empty()) { q1 = q2; queue<int> q; q2 = q; ...
当headStack 中没有元素时,将 tailStack 中所有的元素都 push 进 headStack 中。 这样一来,就用两个栈模拟了队列的出入顺序。 我们来看一下代码实现: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicclassCQueue{//定义两个栈Deque<Integer>headStack,tailStack;publicCQueue(){headStack=newLinkedL...