Solving Invert Binary Tree using Recursion.

Problem

Mirror the tree.

Pattern

This problem demonstrates the Recursion pattern.

Approach

Swap left/right recursively.

Solution 

  // Solution for Invert Binary Tree
// Pattern: Recursion
// 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