AlgoSolveoRoadmap › Stage 6: Trees › Pattern 30 of 53
DSA pattern guide
Binary Search Tree
Sorted tree: search, insert, validate, kth smallest.
Use it when
Sorted tree: search, insert, validate, kth smallest.
Key idea
Left < node < right. Inorder traversal gives sorted order, and each step discards half the tree.
Practice problems, in order
- Convert Sorted Array to BSTEasy
- Search in a BSTEasy
- Insert into a BSTMedium
- Validate Binary Search TreeMedium
- Delete Node in a BSTMedium
- Kth Smallest Element in BSTMedium
- Convert BST to Greater TreeMedium
- Binary Search Tree IteratorMedium
- Lowest Common Ancestor of BSTMedium
- Recover BSTMedium
- Maximum Sum BST in Binary TreeHard
How to practise this pattern
- Read the problem and look for the signal above before writing any code.
- Say the brute force out loud, with its time complexity, then ask what work it repeats.
- Apply the key idea and write the optimised version yourself.
- If you're stuck for more than 10 minutes, take one small hint, not the full solution.
- Move to the next problem only when you can explain why this pattern fits.
Stuck on one of these?
The AlgoSolveo extension (free, launching soon) sits beside the LeetCode problem and gives the smallest hint that gets you moving, never the full answer. Solved problems tick off on your roadmap.
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