class tree_node: def __init__(self, key = None, left = None, right = None): self.key = key self.left = left self.right = right class binary_search_tree: def __init__(self): self.root = None def preorder(self): print 'preorder: ', self.__preorder(self.root) print def ...
二叉搜索树(Binary Search Tree,BST),又称为二叉搜索树,二叉排序树,是具有下列性质的二叉树: 若它的左子树不空,则左子树上所有结点的值均小于它的根结点的值; 若它的右子树不空,则右子树上所有结点的值均大于它的根结点的值; 它的左、右子树也分别为二叉排序树。
# class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right class Solution: def generateTrees(self, n: int) -> List[Optional[TreeNode]]: return self.helper(1, n) def helper(self, l, r): if l > r:...
def search(self, node, parent, data): if node is None: return False, node, parent if node.data == data: return True, node, parent if node.data > data: return self.search(node.lchild, node, data) else: return self.search(node.rchild, node, data) # 插入 def insert(self, data):...
Python Binary Search Tree 二叉搜索树 二叉搜索树，也叫二叉查找树（Binary Search Tree，BST），特性是每个结点的值都比左子树大，比右子树小。中序遍历是递增的 实现 find_item(item, root) —— 寻找树中等于某个值的结点，利用 BST 的特性，若一个结点比该值大，则往结点的左边寻找，若一个结点比该值...
代码(Python3) # Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right class BSTIterator: def __init__(self, root: Optional[TreeNode]): # 初始化一个空结点栈(所有...
python class TreeNode: def __init__(self, x): self.val = x self.left = None self.right = None def preorderTraversal(root): if root is None: return print(root.val) # 访问根节点 preorderTraversal(root.left) # 遍历左子树 preorderTraversal(root.right) # 遍历右子树 ...
数据结构之二叉树(Binary Tree)_python实现 1.二叉树的类定义 2.二叉树的基本性质 3.遍历二叉树 3.1前序遍历 3.2中序遍历 3.3后序遍历 3.4层次遍历 4.二叉树的应用 4.1二叉搜索树 4.2平衡二叉树 4.3红黑树 4.4线段树 4.5堆 5.参考文献 1.二叉树的类定义...
1.Write a Python program to create a Balanced Binary Search Tree (BST) using an array of elements where array elements are sorted in ascending order. Click me to see the sample solution 2.Write a Python program to find the closest value to a given target value in a given non-empty Bina...
二叉树的遍历 class treeNode: def __init__(self, x): self.val = x self.left = None self.right = None 深度优先搜索（Depth First Search, DFS）非递归的版本在完整代码中前序遍历 PreOrder Traversal：根-左结点-右结点 def preorder(root): if root is None: return [] return...