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 既可以实现栈,还能实现列表,所以咱这题的代码,和那个队列模拟栈的就很类似了。 ## LeetCode 232## Impletement Queue using StackclassMyQueue:def__init__(self):self.l1=[]## stack 1 = l1se...
popStack) - 1] return top } func (this *MyQueue) Peek() int { // 先进行转移,避免 pop 栈为空 this.transfer() // 返回 pop 栈顶元素 return this.popStack[len(this.popStack) - 1] } func (this *MyQueue) Empty() bool { // 当两个栈都为空是,队列才为空 return len(this.pushStac...
class Queue(object): def __init__(self): """ initialize your data structure here. """ self.inStack=[] self.outStack=[] def push(self, x): """ :type x: int :rtype: nothing """ self.inStack.append(x) def pop(self): """ :rtype: nothing """ self.peek() self.outStack....
链接:https://leetcode-cn.com/problems/implement-queue-using-stacks/solution/yong-zhan-shi-xian-dui-lie-by-leetcode-s-xnb6/ python # 0232.栈实现队列 """ """ classMyQueue: def__init__(self): # in -> push, out -> pop self.stack_in = [] self.stack_out = [] defpush(self,x:...
Given below are the different ways to implement a queue in python: list collections.deque queue.Queue Implementation using list The list is a built-in data structure in python that can be used as a queue. In place of enqueue() and dequeue(), there are append() and pop() functions. ...
This type of queue is useful when we want to store data in a circular manner and treat the data structure as a circular list. In a circular queue, there are two pointers, front and rear. You can dequeue elements using the front pointer and enqueue elements using the rear pointer in a ...
You must use only standard operations of a stack – which means only push to top, peek/pop from top, size, and is empty operations are valid. Depending on your language, stack may not be supported natively. You may simulate a stack by using a list or deque (double-ended queue), as ...
Data persistence modules save Python data between program runs. These tools range from simple file-based storage to complex serialization systems, offering different tradeoffs between speed, compatibility, and human readability. Storage format comparison: FormatHuman ReadableCross LanguagePerformance pickle No...
2. Create an empty queue: queue = deque() We create an empty queue using the `deque()` constructor from the `deque` class. This creates an empty queue object that we will use to store the elements. 3. Start the menu-driven loop: while True: print("Menu:") print("1. Add element...
The following Python program uses theheapqmodule to implement a simple priority queue: importheapqclassPriorityQueue:def__init__(self):self._queue=[]self._index=0defpush(self,item,priority):heapq.heappush(self._queue,(-priority,self._index,item))self._index+=1defpop(self):returnheapq.heappo...