File: root - text - article - 2020 - 02 - most-frequent-subtree-sum.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 | 600 Views, 24144 Search Bots | 147 Words
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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 | 600 Views, 24144 Search Bots | 147 Words
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Hi, here's your problem today. This problem was recently asked by LinkedIn:
Given a binary tree, find the most frequent subtree sum.
Example:
The above tree has 3 subtrees. The root node with 3, and the 2 leaf nodes, which gives us a total of 3 subtree sums. The root node has a sum of 1 (3 + 1 + -3), the left leaf node has a sum of 1, and the right leaf node has a sum of -3. Therefore the most frequent subtree sum is 1.
If there is a tie between the most frequent sum, you can return any one of them.
Here's some starter code for the problem:
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 | 600 Views, 24144 Search Bots | 147 Words Given a binary tree, find the most frequent subtree sum.
Example:
3
/ \
1 -3
The above tree has 3 subtrees. The root node with 3, and the 2 leaf nodes, which gives us a total of 3 subtree sums. The root node has a sum of 1 (3 + 1 + -3), the left leaf node has a sum of 1, and the right leaf node has a sum of -3. Therefore the most frequent subtree sum is 1.
If there is a tie between the most frequent sum, you can return any one of them.
Here's some starter code for the problem:
class Node():
def __init__(self, value, left=None, right=None):
self.val = value
self.left = left
self.right = right
def most_freq_subtree_sum(root):
# fill this in.
root = Node(3, Node(1), Node(-3))
print(most_freq_subtree_sum(root))
# 1
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