*/functionpush($x){while(!$this->empty()) {$this->stack2[] =array_pop($this->stack1); }$this->stack1[] =$x;while(!empty($this->stack2)) {$this->stack1[] =array_pop($this->stack2); } }/** * Removes the element from in front of queue and returns that element. *@re...
}returns2.pop(); }publicintpeek(){if(s2.isEmpty()) {while(!s1.isEmpty()) { s2.push(s1.pop()); } }returns2.peek(); }publicbooleanempty(){if(s1.isEmpty() && s2.isEmpty()) {returntrue; }else{returnfalse; } }
【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) ...
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 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...
Leetcode之Implement strStr() 问题 问题描述: Implement strStr(). Returns the index of the first occurrence of needle(针) in haystack(干草堆), or -1 if needle is not part of haystack. 题目来源:Implement strStr() (详细地址:https://leetcode.com/problems/......
Leetcode 225. Implement Stack using Queues 题目描述 用栈实现队列的如下操作: push(x) -- 将元素x加入到队列末端 pop() -- 移除队列首元素并返回值 peek() -- 返回队列首元素值 empty() -- 返回队列是否为空 注意 你必须仅能使用栈的标准操作 -- push to top, peek/pop from top, size, and...
LeetCode 232. Implement Queue using Stacks 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. empty(......
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. empty() -- Return whether the queue is empty. ...
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。
232. Implement Queue using Stacks # 题目# 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. empty() – Return whether the queue is empty...