实现双链表的基本功能，包括链表的创建和消除，节点的增删改查等功能-Doubly linked list of basic functions, including the creation and the elimination of the linked list node additions and deletions to change search functions

在控制台树形输出二叉树，使用了队列。首先设置叶子节点间的间距，然后以坐标的形似记录下每个节点的位置-Binary output in the console tree, using a queue. The spacing between the first set of leaf nodes, then the coordinates of the shape of the recording position of each node

Addition of three numbers using linked lists. each digit is stored in a node.