Definition: The (weight) balance of a tree is the number of leaves of the left subtree of a tree, denoted |Tl|, divided by the total number of leaves of the tree. Formally, ρ(T) = |Tl|/|T|.
Also known as root balance.
See also BB(α) tree, height-balanced tree, right rotation, left rotation, relaxed balance.
Note: The balance of a node is the balance of the (sub)tree rooted at that node. After Johann Blieberger <firstname.lastname@example.org>, Discrete Loops and Worst Case Performance, page 22.
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Entry modified 20 December 2004.
HTML page formatted Fri Mar 25 16:20:34 2011.
Cite this as:
Paul E. Black, "balance", in Dictionary of Algorithms and Data Structures [online], Paul E. Black, ed., U.S. National Institute of Standards and Technology. 20 December 2004. (accessed TODAY) Available from: http://www.nist.gov/dads/HTML/balance.html