GPD2021

https://www.acmicpc.net/problem/24955// https://www.acmicpc.net/problem/24955class Node { constructor(item) { this.item = item; this.next = null; }}class Queue { constructor() { this.head = null; this.tail = null; this.length = 0; } push(item) { const node = new Node(item); if (this.head == null) { this.head = node; } else { this.tail.next = node; } this.tail = node; this.length +..