Range Sum of BST | Leetcode 938 in Telugu | Inorder, Optimized DFS | srkcodes
1Welcome to srkcodes, your one-stop Telugu hub for cracking DSA problems, Python coding, and interview prep with real Leetcode questions!
In this video, we solve Leetcode 938: Range Sum of BST in 2 powerful ways using Python.
🔍 What You’ll Learn Today:
Brute Force using Inorder Traversal (DFS)
Traverse the entire tree in sorted order.
Pick only values that fall inside the [low, high] range.
Simple yet effective when node count is low.
Optimized DFS using BST Properties
Smartly avoid unnecessary nodes using BST rules.
Only explore left/right subtree if it may contain valid values.
Increases efficiency — ideal for large input trees.
Time & Space Complexity
Understand the trade-offs between both methods.
Choose the right one during coding interviews.
Step-by-Step Python Code (with Telugu Explanation)
Beginner-friendly walkthrough with recursion logic.
Perfect for those learning trees and recursion in Python.
🧠 Why It’s Important:
Frequently asked in product-based companies like Amazon, Microsoft, etc.
Strengthens Binary Search Tree + DFS fundamentals.
Builds problem-solving habits for optimized thinking.
💬 Practice Question for You:
Try solving with Iterative DFS or BFS as practice. Comment your approach below!
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🔗 External Study Resources for Deep Dive:
📝 Problem discussed in the video ➡ ️ https://leetcode.com/problems/range-sum-of-bst/.
📚 Topic's ⬇ ️
BSThttps://www.programiz.com/dsa/binary-search-tree...
💡 LeetCode problems https://leetcode.com/problem-list/binary-search-tree/in...