# Weight-balanced tree

In computer science, weight-balanced binary trees (WBTs) are a type of self-balancing binary search trees that can be used to implement dynamic sets, dictionaries (maps) and sequences.[1] These trees were introduced by Nievergelt and Reingold in the 1970s as trees of bounded balance, or BB[α] trees.[2][3] Their more common name is due to Knuth.[4]

Like other self-balancing trees, WBTs store bookkeeping information pertaining to balance in their nodes and perform rotations to restore balance when it is disturbed by insertion or deletion operations. Specifically, each node stores the size of the subtree rooted at the node, and the sizes of left and right subtrees are kept within some factor of each other. Unlike the balance information in AVL trees (which store the height of subtrees) and red-black trees (which store a fictional "color" bit), the bookkeeping information in a WBT is an actually useful property for applications: the number of elements in a tree is equal to the size of its root, and the size information is exactly the information needed to implement the operations of an order statistic tree, viz., getting the n'th largest element in a set or determining an element's index in sorted order.[5]

Weight-balanced trees are popular in the functional programming community and are used to implement sets and maps in MIT Scheme, SLIB and implementations of Haskell.[6][4]

## Description

A weight-balanced tree is a binary search tree that stores the sizes of subtrees in the nodes. That is, a node has fields

• key, of any ordered type
• value (optional, only for mappings)
• left, right, pointer to node
• size, of type integer.

By definition, the size of a leaf (typically represented by a nil pointer) is zero. The size of an internal node is the sum of sizes of its two children, plus one (size[n] = size[n.left] + size[n.right] + 1). Based on the size, one defines the weight as weight[n] = size[n] + 1.[a]

Operations that modify the tree must make sure that the weight of the left and right subtrees of every node remain within some factor α of each other, using the same rebalancing operations used in AVL trees: rotations and double rotations. Formally, node balance is defined as follows:

A node is α-weight-balanced if weight[n.left] ≥ α·weight[n] and weight[n.right] ≥ α·weight[n].[7]

Here, α is a numerical parameter to be determined when implementing weight balanced trees. Larger values of α produce "more balanced" trees, but not all values of α are appropriate; Nievergelt and Reingold proved that

${\displaystyle \alpha <1-{\frac {1}{\sqrt {2}}}}$

is a necessary condition for the balancing algorithm to work. Later work showed a lower bound of 211 for α, although it can be made arbitrarily small if a custom (and more complicated) rebalancing algorithm is used.[7]

Applying balancing correctly guarantees a tree of n elements will have height[7]

${\displaystyle h\leq \log _{\frac {1}{1-\alpha }}n={\frac {\log _{2}n}{\log _{2}\left({\frac {1}{1-\alpha }}\right)}}=O(\log n)}$

The number of balancing operations required in a sequence of n insertions and deletions is linear in n, i.e., balancing takes a constant amount of overhead in an amortized sense.[8]

## Notes

1. ^ This is the definition used by Nievergelt and Reingold. Adams uses the size as the weight directly,[6] which complicates analysis of his variant and has led to bugs in major implementations.[4]

## References

1. ^ Tsakalidis, A. K. (1984). "Maintaining order in a generalized linked list". Acta Informatica. 21: 101. doi:10.1007/BF00289142.
2. ^ Nievergelt, J.; Reingold, E. M. (1973). "Binary Search Trees of Bounded Balance". SIAM Journal on Computing. 2: 33. doi:10.1137/0202005.
3. ^  This article incorporates public domain material from the NIST document: Black, Paul E. "BB(α) tree". Dictionary of Algorithms and Data Structures.
4. ^ a b c Hirai, Y.; Yamamoto, K. (2011). "Balancing weight-balanced trees" (PDF). J. Functional Programming. 21 (3): 287. doi:10.1017/S0956796811000104.
5. ^ Roura, Salvador (2001). A new method for balancing binary search trees. ICALP. Lecture Notes in Computer Science. 2076. pp. 469–480. doi:10.1007/3-540-48224-5_39. ISBN 978-3-540-42287-7.
6. ^ a b Adams, Stephen (1993). "Functional Pearls: Efficient sets—a balancing act". Journal of Functional Programming. 3 (4): 553–561. doi:10.1017/S0956796800000885.
7. ^ a b c Brass, Peter (2008). Advanced Data Structures. Cambridge University Press. pp. 61–71.
8. ^ Blum, Norbert; Mehlhorn, Kurt (1980). "On the average number of rebalancing operations in weight-balanced trees" (PDF). Theoretical Computer Science. 11 (3): 303–320. doi:10.1016/0304-3975(80)90018-3.