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
while i<len(self.inQueue)-1: self.outQueue.append(self.inQueue[i]) i+=1 self.inQueue=self.outQueue self.outQueue=[] def top(self): """ :rtype: int """ tmpQueue=self.inQueue i=0; while i<(len(self.inQueue)-1): self.outQueue.append(self.inQueue[i]) i+=1 res=[i for...
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...
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...
class Stack: # initialize your data structure here. def __init__(self): self.q_ = Queue() # @param x, an integer # @return nothing def push(self, x): self.q_.push(x) for _ in xrange(self.q_.size() - 1): self.q_.push(self.q_.pop()) # @return nothing ...
Python解法 下面的python代码是把stack2当做是和队列顺序一样的,这样的话,如果stack2不空,那么久弹出元素就行。否则,如果stack1中有元素,那么在做push和pop的时候,需要先把stack1中的元素颠倒到stack2中。 class MyQueue(object): def __init__(self): ...
class MyQueue: def __init__(self): self.stack_in = [] self.stack_out = [] def push(self, x: int) -> None: self.stack_in.append(x) def pop(self) -> int: if self.empty(): return None if self.stack_out: return self.stack_out.pop() ...
// Removes an element from the queue pop(st) 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 ...
queue.LifoQueue Using list to Create a Python Stack The built-in list structure that you likely use frequently in your programs can be used as a stack. Instead of .push(), you can use .append() to add new elements to the top of your stack, while .pop() removes the elements in the...
Ending the dialog pops it off the dialog stack and returns an optional result to the dialog's parent. The parent is the dialog or method that started the dialog that just ended. csharp Copy else { msg += $" Your profile will not be kept."; } await stepContext.Context.SendActivity...