常用的算法经典代码，包括快速排序，冒泡排序等各种排序方法，还有二叉树的前序、中序和后序遍历等-The classic algorithm code, including quick sort and bubble sort sorting methods, as well as the preamble of the binary tree, inorder and postorder traversal, etc.

二叉树遍历，包括前中后序递归遍历和计算椰子树和节点数-Binary tree traversal, including former in after sequence recursively traverse and calculation of coconut trees and the number of nodes