queue_1.add(x); top = x; }/** Removes the element on top of the stack and returns that element. */publicintpop(){if(empty()){thrownewRuntimeException("MyStack空了!"); }while(queue_1.size() >1){ top = queue_1.remove(); queue_2.add(top); }intlast_ele=queue_1.remove()...
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). 题意及分析:用标准的queue实现stack。这里关键就是添加完成时,刚添加的点要在queue最前面,将queue的前面的点依次取出并添加到queue尾就可以实现这个stack添加功能。 代码: 1 2 3...
while(!queue2.isEmpty()){ top = queue2.poll(); queue1.offer(top); } }else{ while(!queue1.isEmpty()){ top = queue1.poll(); queue2.offer(top); } } return top; } /** Returns whether the stack is empty. */ public boolean empty() { return queue1.isEmpty() && queue2.isE...
import java.util.LinkedList; import java.util.Queue; class Solution { Queue[] queues; int cur; Solution() { queues = new LinkedList[2]; queues[0] = new LinkedList<Integer>(); queues[1] = new LinkedList<Integer>(); cur = 0; } // Push element x onto stack. public void push(int ...
import java.util.ArrayList;import java.util.LinkedList;import java.util.Queue;classMyStack{privateQueue<Integer>q=newLinkedList<Integer>();// Push element x onto stack.publicvoidpush(intx){q.offer(x);}// Removes the element on top of the stack.publicvoidpop(){if(q.isEmpty())return;Array...
You may assume that all operations are valid (for example, no pop or top operations will be called on an empty stack). java中的LinkedList实现了Queue接口,可以直接使用。 queue提供了offer()方法和poll()方法,用于加入元素和删除队首元素。
classMyQueue4{privateStack<Integer>stack;/** Initialize your data structure here. */publicMyQueue4(){stack=newStack<Integer>();}/** Push element x to the back of queue. */publicvoidpush(intx){stack.add(0,x);}/** Removes the element from in front of queue and returns that element...
仅使用两个队列(queue)实现一个后进先出(last-in-frist-out)(LIFO)的栈(stack)。你实现的栈需要满足常规栈的操作。(push、top、pop、empty)。 implement the MyStack class: void push(int x) Pushes element x to the top of the stack. int pop() Removes the element on the top of the stack and...
queue:2->1->3--->queue:1->3->2--->queue:3->2->1... 这样不管什么时候出队顺序都和出栈的顺序相同,并且题目要求实现的所有方法可直接套用队列的方法。 Java: 方法一 代码语言:javascript 复制 classMyStack{Queue<Integer>queue1;Queue<Integer>queue2;privateint top;//指向栈顶元素publicMyStack(...
仅使用两个队列(queue)实现一个后进先出(last-in-frist-out)(LIFO)的栈(stack)。你实现的栈需要满足常规栈的操作。(push、top、pop、empty)。 implement the MyStack class: void push(int x)Pushes element x to the top of the stack. int pop()Removes the element on the top of the stack and re...