Tree Height / Balance Check

The Tree Height / Balance Check technique is applied when tackling problems characterized by specific invariants in the problem state or constraints:

• Core Strategy: Compute subtree heights bottom-up during DFS to check depth or balance conditions, often with early termination.
• When to use: Look for opportunities where repeated re-computation can be replaced by maintaining monotonic properties, state windows, or relational pointers.
• Interview Signal: Demonstrating this pattern shows mastery of Trees foundations, reducing worst-case algorithmic complexity.