postorder traversal


Definition: Process all nodes of a tree by recursively processing all subtrees, then finally processing the root.

Also known as postfix traversal.

Generalization (I am a kind of ...)
tree traversal, depth-first search.

See also in-order traversal, preorder traversal, level-order traversal, Cupif-Giannini tree traversal.

Note: For instance, if the "processing" is just printing, a tree is printed as "(first subtree) (second subtree) ... (last subtree) root". Here is pseudocode for a binary tree:

if tree is null, return;


Author: PEB

More information

animation (Java)

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Entry modified 24 August 2017.
HTML page formatted Fri Feb 23 10:06:08 2018.

Cite this as:
Paul E. Black, "postorder traversal", in Dictionary of Algorithms and Data Structures [online], Vreda Pieterse and Paul E. Black, eds. 24 August 2017. (accessed TODAY) Available from: