# binary-indexed-tree: Binary Indexed Trees (a.k.a. Fenwick Trees).

Binary indexed trees are a data structure on indexes 1 through n. They allow you to compute the sum of all values at indexes 1 through i in O(logn) and to increase the value at index i in O(logn).

This implements binary indexed trees, both as an immutable data structure in pure code and as a mutable data structure using the ST Monad.

Both the immutable and mutable version have the same runtime complexity, but the mutable version has a smaller constant.

Written by Maxwell Sayles (2012).

Versions [faq] | 0.1 |
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Dependencies | array (>=0.3), base (>=3 && <5) [details] |

License | LicenseRef-LGPL |

Author | Maxwell Sayles <maxwellsayles@gmail.com> |

Maintainer | Maxwell Sayles <maxwellsayles@gmail.com> |

Category | Data |

Uploaded | by MaxwellSayles at Wed Oct 10 21:19:48 UTC 2012 |

Distributions | NixOS:0.1 |

Downloads | 868 total (30 in the last 30 days) |

Rating | (no votes yet) [estimated by rule of succession] |

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Status | Docs uploaded by user Build status unknown [no reports yet] |

## Downloads

- binary-indexed-tree-0.1.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)