/* Stack.java */publicinterfaceStack<Item>{Item pop();// return the top item and removes it from stackvoidpush(Item item);// adds an item to the stackbooleanisEmpty();// returns true if stack is empty, false otherwiseintsize();// returns the number of items in stack right now} ...
Write a C# program to implement a stack with push and pop operations. Find the top element of the stack and check if the stack is empty or not. Sample Solution: C# Code: usingSystem;// Implementation of a Stack data structurepublicclassStack{privateint[]items;// Array to hold stack elem...
inStack.push(x); } 复杂度分析如下: 时间复杂度:O(1)O(1) 空间复杂度:O(n)O(n),需要额外的空间用于存储队列元素 出队(pop) 在入队时,由于先入的元素处于输入栈inStack的栈底,因此,为了能够弹出栈底的元素实现出队操作,需要将输入栈inStack中的元素弹出并压入到输出栈outStack中。此时,输出栈outStack...
}/** 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)...
Implement a last in first out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal queue (push, top, pop, and empty). Implement the MyStack class: void push(int x) Pushes element x to the top of the stack. int pop() Removes the el...
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. Notes: You must use only standard operations of a stack -- which means only push to top, peek...
public int pop(){ if(queue1.size()==0) throw new QueueEmptyException("Underflow Exception"); return queue1.remove(); } public static void main(String[] args) { StackUsingTwoQueues stack = new StackUsingTwoQueues(); stack.push(20); stack.push(40); stack.push(70); stack.push(50);...
1. Write a C# program to implement a stack with push and pop operations. Find the top element of the stack and check if the stack is empty or not. Click me to see the sample solution2. Write a C# program to sort the elements of a given stack in descending order. Click me to ...
A Stack suporta as seguintes operações: pushinsere um item no topo da Stack (ou seja, acima de seu elemento superior atual). popremove o objeto no topo da Stack e retorna esse objeto da função. O tamanho da Stack será decrementado em um. ...
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) Java 实现 Python 实现 更多 LeetCode 题解笔记可以访问我的 github。