File: root - text - article - 2019 - 11 - validate-binary-search-tree.txt.txt
Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | Home Page | Category: Computing | 315 Views, 16894 Search Bots | 128 Words
| Browse | Archive
![Subscribe to Feed Burner Subscribe to Feed Burner](/images/form/rss.gif)
Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | Home Page | Category: Computing | 315 Views, 16894 Search Bots | 128 Words
![Subscribe to Feed Burner Subscribe to Feed Burner](/images/form/rss.gif)
Hi, here's your problem today. This problem was recently asked by Facebook:
You are given the root of a binary search tree. Return true if it is a valid binary search tree, and false otherwise. Recall that a binary search tree has the property that all values in the left subtree are less than or equal to the root, and all values in the right subtree are greater than or equal to the root.
Here's a starting point:
Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | Home Page | Cateogry: Computing | 315 Views, 16894 Search Bots | 128 Words You are given the root of a binary search tree. Return true if it is a valid binary search tree, and false otherwise. Recall that a binary search tree has the property that all values in the left subtree are less than or equal to the root, and all values in the right subtree are greater than or equal to the root.
Here's a starting point:
class TreeNode:
def __init__(self, key):
self.left = None
self.right = None
self.key = key
def is_bst(root):
# Fill this in.
a = TreeNode(5)
a.left = TreeNode(3)
a.right = TreeNode(7)
a.left.left = TreeNode(1)
a.left.right = TreeNode(4)
a.right.left = TreeNode(6)
print is_bst(a)
# 5
# / \
# 3 7
# / \ /
#1 4 6
![Subscribe to Feed Burner Subscribe to Feed Burner](/images/form/rss.gif)
Related Articles
- Daily Interview Problem: Reconstrunct Binary Tree from Preorder and Inorder Traversals
- Daily Interview Problem: Maximum Profit From Stocks
- Daily Interview Question: Edit Distance
- Algorithm Interview: Longest Consecutive Sequence
- Print a tree level-by-level, with line-breaks
- [Daily Problem] Angles of a Clock
- 56 Bytes
- Algorithm Interview: Lowest Common Ancestor of 2 Nodes in Binary Tree
- Algorithm Interview Question: H-Index
- Multitasking
©2006~2024 SteakOverCooked - 0.01035 Seconds(s) - 5251.382 KB/s - 101 Online
Memory: 516.67 KB
18:54:01 up 13 days, 18:33, 2 users, load average: 0.98, 0.86, 0.73 - Server PHP Version: 7.4.33
How to Cook a Perfect Steak? | <meta name="robots" content="noindex, follow" />
![](/images/top.jpg)
18:54:01 up 13 days, 18:33, 2 users, load average: 0.98, 0.86, 0.73 - Server PHP Version: 7.4.33
Read & Write - Normal - Mini - Post - All Comments - Statistics
Be the first one to comment this page !