Python实现二叉树-创新互联

二叉树算法python实现:
1.添加节点
2.广度优先遍历
3.深度优先遍历:先序遍历,中序遍历,后序遍历

成都创新互联公司主营察哈尔右翼后网站建设的网络公司,主营网站建设方案,成都APP应用开发,察哈尔右翼后h5成都微信小程序搭建,察哈尔右翼后网站营销推广欢迎察哈尔右翼后等地区企业咨询
# -*- codding:utf-8 -*-
class Node(object):
    """节点"""
    def  __init__(self,item):
        self.elem = item
        self.lchild = None
        self.rchild = None

class Tree(object):
    """二叉树"""
    def __init__(self):
        self.root = None

    def add(self,item):
        node =Node(item)

        if self.root is None:
            self.root = node
            return
        queue = [self.root]

        while queue:
            cur_node =  queue.pop(0)
            if cur_node.lchild is None:
                cur_node.lchild = node
                return
            else :
                queue.append(cur_node.lchild)
            if cur_node.rchild is None:
                cur_node.rchild = node
                return
            else :
                queue.append(cur_node.rchild)

    def bread_travel(self):
        """广度遍历"""
        if self.root is None:
            return
        queue = [self.root]

        while queue:
            cur_node = queue.pop(0)
            print(cur_node.elem,end= " ")
            if cur_node.lchild is not None:
                queue.append(cur_node.lchild)
            if cur_node.rchild is not None:
                queue.append(cur_node.rchild)

    def pre_travel(self,node):
        """前序遍历"""
        if node is None:
            return
        print(node.elem,end = " ")
        self.pre_travel(node.lchild)
        self.pre_travel(node.rchild)

    def mid_travel(self,node):
        """中序遍历"""
        if node is None:
            return
        self.mid_travel(node.lchild)
        print(node.elem,end = " ")
        self.mid_travel(node.rchild)

    def post_travel(self,node):
        """后序遍历"""
        if node is None:
            return
        self.post_travel(node.lchild)
        self.post_travel(node.rchild)
        print(node.elem, end=" ")

if __name__ == "__main__":
    tree = Tree()
    tree.add(0)
    tree.add(1)
    tree.add(2)
    tree.add(3)
    tree.add(4)
    tree.add(5)
    tree.add(6)
    tree.add(7)
    tree.add(8)
    tree.add(9)
    tree.bread_travel()
    print(" ")
    tree.pre_travel(tree.root)
    print(" ")
    tree.mid_travel(tree.root)
    print(" ")
    tree.post_travel(tree.root)

# 0 1 2 3 4 5 6 7 8 9    层次遍历
# 0 1 3 7 8 4 9 2 5 6    前序遍历
# 7 3 8 1 9 4 0 5 2 6    中序遍历
# 7 8 3 9 4 1 5 6 2 0    后序遍历

另外有需要云服务器可以了解下创新互联cdcxhl.cn,海内外云服务器15元起步,三天无理由+7*72小时售后在线,公司持有idc许可证,提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案,具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势,专为企业上云打造定制,能够满足用户丰富、多元化的应用场景需求。


本文标题:Python实现二叉树-创新互联
文章源于:http://ybzwz.com/article/cdopeh.html