lca alternatives and similar packages
Based on the "Algorithms" category.
Alternatively, view lca alternatives based on common mentions on social networks and blogs.
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edit-distance-linear
Levenshtein edit distance in linear memory (also turns out to be faster than C++) -
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README
lca: O(log h) Online Lowest Common Ancestor Search
This package provides a reference implementation of my skew binary random access algorithm for performing an online lowest common ancestor in logarithmic time without preprocessing. This improves the previous known asymptotic bound for this problem from O(h) to O(log h), where h is the height of the tree. Mostly importantly this bound is completely independent of the width or overall size of the tree, enabling you to calculate lowest common ancestors in a distributed fashion with good locality.
While algorithms exist that that provide O(1) query time, they all require O(n) preprocessing, where n is the size of the entire tree, and so are less suitable for LCA search in areas such as revision control where the tree is constantly updated, or distributed computing where the tree may be too large to fit in any one computer's memory.
Slides are available as Purely Functional Data Structures for On-Line LCA
Contact Information
Contributions and bug reports are welcome!
Please feel free to contact me through github or on the #haskell IRC channel on irc.freenode.net.
-Edward Kmett