Tree Serialization / Deserialization

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

• Core Strategy: Encode a tree into a linear representation (e.g. preorder with null markers) and decode it back into the same structure.
• 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.