Web Reference: Design an algorithm to serialize and deserialize a binary tree. There is no restriction on how your serialization/deserialization algorithm should work. You just need to ensure that a binary tree can be serialized to a string and this string can be deserialized to the original tree structure. Oct 4, 2025 · Serialization: Perform preorder traversal, store node values and insert -1 wherever a node is null. Deserialization: Rebuild the tree by reading values in preorder order. If the value is -1, return null. Otherwise, create a node and recursively build its left and right children. Serialization means taking a binary tree data structure and converting it into a string format that can be easily stored or transmitted. Deserialization means taking that string and reconstructing the exact same binary tree from it.
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