TreesLesson 25Free preview

DSA Pre-order Traversal

This lesson is part of DSA · All levels

Summary

Pre-order traversal tracks the tree in the order: node first, then left subtree, then right subtree. This pattern is useful for copying tree structures, evaluating prefix expressions, or creating serial representations of trees. Implementation can be recursive or iterative using stacks.

Key points

Order of visits: root, left, right
Suitable for copying tree or serialization structures
Can be written recursively or iteratively with stack
Generate a special sequence that can be used to reconstruct the tree

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