LeetCode 129: Sum Root to Leaf Numbers | C# Solution | Depth-First Search
🌲 Dive into LeetCode 129, where we transform root-to-leaf paths in binary trees into numbers and find their sum! A perfect problem to practice #depthfirstsearch and #binarytree traversal in #csharp.
⏱️ Time Complexity: O(n) where n is the number of nodes
🧮 Space Complexity: O(h) where h is the height of the tree
📌 Timestamps
00:00 - Understanding problem statement
01:19 - Using DFS traversal
02:17 - Big O Notation explained
02:40 - C# solution walk-through
03:42 - Solution analysis - runtime + memory
🔑 Key Concepts
Depth-First Search (DFS)
Binary Tree Traversal
Path Sum Problems
Recursive Tree Traversal
Number formation through tree paths
📚 Learning Points
How to use DFS to explore all paths in a binary tree
Techniques for accumulating values during tree traversal
Converting path sequences into meaningful numbers
Building efficient recursive solutions for tree problems
🔄 Related Problems
LeetCode 112: Path Sum
LeetCode 113: Path Sum II
LeetCode 257: Binary Tree Paths
LeetCode 437: Path Sum III
👥 Target Audience
Software engineers preparing for technical interviews
Computer science students learning tree algorithms
Developers looking to improve their #csharp and #algorithmskills
Anyone interested in #leetcode problem-solving techniques
📝 Prerequisites
Basic understanding of C# programming
Familiarity with binary trees and tree traversal
Knowledge of recursive algorithms
Understanding of depth-first search
🔗 Links
LeetCode problem: https://leetcode.com/problems/sum-roo...
Solution code: https://shortenertool-qojxs-fa.azurew...
👋 Let's Connect!
If you found this video helpful, please hit that like button and subscribe for weekly #codinginterview preparation content! Drop your questions or alternative approaches in the comments below—I'd love to hear your thoughts on this #dfs solution!