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 | 208 Views, 15315 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 | 208 Views, 15315 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 | 208 Views, 15315 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
- 56 Bytes
- Algorithm Interview: Smallest Number that is not a Sum of a Subset of List
- Daily Interview Question: Find Cycles in a Graph
- Daily Interview Problem: Trapping Rainwater
- A trick for getting good at coding interviews FASTER
- Find Pythagorean Triplets
- Daily Interview Problem: Queue Using Two Stacks
- [Daily Problem] Validate Balanced Parentheses
- Algorithm Interview: Determine If Linked List is Palindrome
- Daily Interview Problem: Find the Number of Islands
©2006~2024 SteakOverCooked - 0.02356 Seconds(s) - 1174.445 KB/s - 38 Online
Memory: 505.82 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="index, 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 !