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## Removes the top element and returnifself.l1:whilelen(self.l1)>1:self.l2.append(...
peek() 需要考虑; 如果stack 2 非空,直接返回其栈顶元素; 如果stack 2 为空,则把 stack 1的元素全部移动到 stack 2,并返回栈顶元素 pop() 类似于peek,但是在返回的时候是移除操作并返回该元素。 1 读题 LeetCode 232E 用栈实现队列 Implement Queue using Stacks 2 Python 解题 正如咱们前面那个问题,list...
while i<(len(self.inQueue)-1): self.outQueue.append(self.inQueue[i]) i+=1 res=[i for i in self.inQueue if i not in self.outQueue] self.outQueue=[] return res[0] def empty(self): """ :rtype: bool """ return True if (len(self.inQueue))==0 else False...
MyStack stack =newMyStack(); stack.push(1); stack.push(2); stack.top();// returns 2stack.pop();// returns 2stack.empty();// returns false Notes: You must useonlystandard operations of a queue -- which means onlypush to back,peek/pop from front,size, andis emptyoperations are v...
queue:2->1->3--->queue:1->3->2--->queue:3->2->1... 这样不管什么时候出队顺序都和出栈的顺序相同,并且题目要求实现的所有方法可直接套用队列的方法。 Java: 方法一 代码语言:javascript 复制 classMyStack{Queue<Integer>queue1;Queue<Integer>queue2;privateint top;//指向栈顶元素publicMyStack(...
pop() -- Removes the element on top of the stack. top() -- Get the top element. empty() -- Return whether the stack is empty. Notes: You must use only standard operations of a queue -- which means only push to back ...
232. Implement Queue using Stacks 题目: https://leetcode.com/problems/implement-queue-using-stacks/ 难度: Easy 这个题没有乖乖听话,因为当年做过用两个stack来模拟queue 然后不得不说,我Python大法实在太厉害了 这功能强大的,我简直要啧啧啧 classQueue(object):def__init__(self):""" ...
Theclassname of the Java function had been updated to MyStack instead of Stack. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Better Solution:Only push is O(n), others are O(1). Using one queue. 1classMyStack {2//Push element x onto stack.3Queue<Integer>queue;45publicMyStack...
python代码: classMyStack(object):def__init__(self):""" Initialize your data structure here. """self.stack=[]defpush(self,x):""" Push element x onto stack. :type x: int :rtype: void """self.stack.append(x)defpop(self):""" ...
Dequeue an element from the queue. C++ Java Python #include<bits/stdc++.h> using namespace std; class Stack { queue<int>q; public: void push(int val); void pop(); int top(); bool empty(); }; void Stack::push(int val) { int s = q.size(); q.push(val); for (int i=0...