One Pattern, Binary Tree Level Order Traversal & Tree Right Side View | LeetCode 102 & LeetCode 199

In this video, we solve two classic LeetCode tree problems using Breadth First Search:

→ LeetCode 102: Binary Tree Level Order Traversal
→ LeetCode 199: Binary Tree Right Side View

We start by picking the right traversal strategy (BFS vs DFS), build up the BFS algorithm step by step using a queue, then show how a
small shift in perspective takes the same machinery from "every node by level" to "just the rightmost node per level."

By the end you'll understand:
• Why BFS is the natural fit for level-based tree problems
• How a queue drives the traversal one level at a time
• How to adapt level order traversal into the right side view with a tiny change
• Time and space complexity for both solutions

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Chapters:

00:00 - Problem Overview & Level Order Definition
00:22 - BFS (Breadth-First Search) vs DFS Intuition
00:58 - Selecting the Queue-Based Strategy
01:37 - Step-by-Step Traversal Walkthrough
02:14 - Tracking Level Metadata with Tuples
03:17 - Morphing the BFS Template to Code
03:53 - Nested List Formatting (The Snapshot Pattern)
04:21 - Transitioning to LeetCode 199: Right Side View
04:52 - Modifying the Queue for Right Side View
05:21 - Summary, Outro & Call to Action


Practice problems to try next:
• Binary Tree Zigzag Level Order Traversal
• Average of Levels in Binary Tree

#leetcode #algorithms #bfs #binarytree #codinginterview #neetcode

Видео One Pattern, Binary Tree Level Order Traversal & Tree Right Side View | LeetCode 102 & LeetCode 199 канала Depth First