出处:http://www.fengchang.cc/post/123 leetcode地址:https://leetcode.com/problems/implement-magic-dictionary/ 题干我用中文复述一遍。 给定一个单词集合例如{"hello", "world"},和一个单词例如“... leetcode-12-stack 409. Longest Palindrome Given a string which consists of lowercase or uppercase...
publicclassMyStack{ Queue<Integer> q;publicMyStack(){// int size():获取队列长度;//boolean add(E)/boolean offer(E):添加元素到队尾;//E remove()/E poll():获取队首元素并从队列中删除;//E element()/E peek():获取队首元素但并不从队列中删除。q =newLinkedList<>(); }publicvoidpush(int...
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). 要求使用双队列实现一个栈的所有的功能,是一个很经典的问题,需要记住学习。 建议和这道题leetcode 232. Implement Queue using Stacks 双栈实现队列 一起学习。 1)取栈顶元素: ...
}/** Push element x onto stack. */publicvoidpush(intx){ top = x; q1.add(x); }/** Removes the element on top of the stack and returns that element. */publicintpop(){if(q1.size() ==0) {thrownewNoSuchElementException("[ERROR] The stack is empty!"); }while(q1.size() >1)...
【LeetCode题解】232_用栈实现队列(Implement-Queue-using-Stacks) 目录 描述 解法一:在一个栈中维持所有元素的出队顺序 思路 入队(push) 出队(pop) 查看队首(peek) 是否为空(empty) Java 实现 Python 实现 解法二:一个栈入,一个栈出 思路 入队(push) 出队(pop) 查看队首(peek) 是否为空(empty) ...
(self, x):"""Push element x onto stack.:type x: int:rtype: void"""# 向有值的队列中添加值self._filled.append(x)def pop(self):"""Removes the element on top of the stack and returns that element.:rtype: int"""# 检查是否有元素num = len(self._filled)if num == 0: return ...
1 审题 LeetCode 225E 栈Stack:后进先出,last-in-first-out LIFO 队列Queue:先进先出,first-in-first-out FIFO 题目要求: 最多使用2个队列,来实现栈; 支持栈的方法: push(x), 把元素 x 推入栈; top/peek(), 返回栈顶元素; pop,移除栈顶元素; ...
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). 思路: 用两个队列模拟一个栈。每当push、pop的时候都要更新两个队列。 算法: 1. class MyStack { 2. new LinkedList<Integer>(); ...
Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (push,top,pop, andempty). Implement theMyStackclass: void push(int x)Pushes element x to the top of the stack. ...
LeetCode problem solving notes. Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (push, top, pop, and empty).