Solving Validate BST using Inorder/Bounds.

Problem

Check if valid BST.

Pattern

This problem demonstrates the Inorder/Bounds pattern.

Approach

Track min/max bounds per node.

Solution 

  // Solution for Validate BST
// Pattern: Inorder/Bounds
// O(n) time

Complexity

O(n) time

Best Practices

  • Identify the pattern before coding — pattern recognition saves time
  • Handle edge cases: empty input, single element, duplicates
  • Use descriptive variable names even in timed interviews
  • Test with the provided examples plus one custom case