Challenges in construction from preorder traversal

Let us determine if we can uniquely serialize and deserialize a tree using its preorder traversal sequence. Here, serialize means writing the tree out as a flat sequence of values, and deserialize means reading that sequence back to rebuild the original tree. We will start with a simple tree and try to serialize it into its preorder traversal sequence. Then, we will try to reconstruct the same tree using the preorder sequence.

Serialization