1classMyQueue(object):2i_stack =[]3o_stack =[]4def__init__(self):5"""6Initialize your data structure here.7"""8self.i_stack =[]9self.o_stack =[]1011defpush(self, x):12"""13Push element x to the back of queue.14:type x: int15:rtype: void16"""17self.i_stack.append(...
/*how to use two stacks to implement the queue: offer, poll, peek,size, isEmpty offer(3) offer(2) poll() offer(1) peek() offer(6) poll() poll() 3 2 2 1 in (3 2) (1 6) out (2) (3) 6 (1) stack1(in): is the only stack to store new elements when adding a new ...
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 long as you use only standard operations of a stack. You may assume that all operations are valid (for example, no pop or peek operations will be...
简介:A classic interview question. This link has a nice explanation of the idea using two stacks and its amortized time complexity. A classic interview question.This linkhas a nice explanation of the idea using two stacks and its amortized time complexity. I use the same idea in my code, w...
225 题 是使用队列来实现栈,其中介绍了两种解法,解法一通过一个临时队列来实现 pop 和peek。解法二只修改 push 。下边的话,我们依旧借助之前的思想来解决这个问题。 解法一 通过一个临时栈,每次 pop 的时候将原来的元素都保存到临时栈中,只剩下最后一个元素,这个元素是第一个加入栈中的,对于队列就是第一个应...
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...
Implement Queue using Stacks(用栈实现队列) Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front of queue. peek() -- Get the front element....
用两个栈实现队列:https://leetcode.cn/problems/implement-queue-using-stacks/submissions/564009874/ 🌉stack的模拟实现 从栈的接口中可以看出,栈实际是一种特殊的vector,因此使用vector完全可以模拟实现stack。 stack.c 代码语言:javascript 代码运行次数:0 ...
Have you ever had to make a queue out of two stacks or make a stack out of two queues on a whiteboard? You might remember that by creating a queue using two stacks you inherently are choosing to make enqueue or dequeue costly. You also might be more familiar with the simple linked lis...
shiftStack();if(!_old.empty())return_old.top();return0; }//Return whether the queue is empty.boolempty(void) {return_old.empty() &&_new.empty(); }private: stack<int>_old, _new; }; 用栈来实现队列[LeetCode] Implement Queue using Stacks,如需转载请自行联系原博主。