文件: root - text - article - 2019 - 12 - largest-bst-in-a-binary-tree.txt.txt
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标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 主页 | 类别: 计算机科学 | 487 次阅读, 23605 次搜索 | 118 个单词
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Hi, here's your problem today. This problem was recently asked by Twitter:
You are given the root of a binary tree. Find and return the largest subtree of that tree, which is a valid binary search tree.
Here's a starting point:
标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 主页 | 类别: 计算机科学 | 487 次阅读, 23605 次搜索 | 118 个单词 You are given the root of a binary tree. Find and return the largest subtree of that tree, which is a valid binary search tree.
Here's a starting point:
class TreeNode:
def __init__(self, key):
self.left = None
self.right = None
self.key = key
def __str__(self):
# preorder traversal
answer = str(self.key)
if self.left:
answer += str(self.left)
if self.right:
answer += str(self.right)
return answer
def largest_bst_subtree(root):
# Fill this in.
# 5
# / \
# 6 7
# / / \
# 2 4 9
node = TreeNode(5)
node.left = TreeNode(6)
node.right = TreeNode(7)
node.left.left = TreeNode(2)
node.right.left = TreeNode(4)
node.right.right = TreeNode(9)
print largest_bst_subtree(node)
#749
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