pre-order traversal ⇝
traversal
<data>
Processing nodes in a graph one at a time, usually in some specified order. Traversal of a tree is recursively defined to mean visiting the root node and traversing its children. Visiting a node usually involves transforming it in some way or collecting data from it.
In "pre-order traversal", a node is visited before its children. In "post-order" traversal, a node is visited after its children. The more rarely used "in-order" traversal is generally applicable only to binary trees, and is where you visit first a node's left child, then the node itself, and then its right child. For the binary tree: T
/ \
I S
/ \
D E
A pre-order traversal visits the nodes in the order T I D E S.
A post-order traversal visits them in the order D E I S T. An
in-order traversal visits them in the order D I E T S.
Last updated: 2001-10-01
Nearby terms:
travelling salesman ♦ travelling salesman problem ♦ traversal ♦ traverse ♦ traversing
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