https://github.com/duckduckgo/cpp-libface

Fastest auto-complete in the east
https://github.com/duckduckgo/cpp-libface

Last synced: about 2 months ago
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Fastest auto-complete in the east

• Host: GitHub
• URL: https://github.com/duckduckgo/cpp-libface
• Owner: duckduckgo
• Created: 2012-02-06T12:58:49.000Z (over 12 years ago)
• Default Branch: master
• Last Pushed: 2023-03-23T18:45:31.000Z (over 1 year ago)
• Last Synced: 2024-04-15T16:20:26.426Z (5 months ago)
• Language: C++
• Homepage:
• Size: 1.42 MB
• Stars: 258
• Watchers: 93
• Forks: 53
• Open Issues: 11
• Metadata Files:
  • Readme: README.md

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README

        
# lib-face

A very fast auto-complete server; to be used for as-you-type search suggestions.

I have written a [blog post](http://dhruvbird.blogspot.com/2010/09/very-fast-approach-to-search.html) comparing various methods for implementing auto-complete for user queries.

lib-face implements *Approach-4* as mentioned in the blog post. The total cost of querying (TCQ) a corpus of 'n' phrases for not more than 'k' frequently occurring phrases that share a prefix with a supplied phrase is O(k log n). This is close the best that can be done for such a requirement. lib-face also provides an option to switch to using another (faster) algorithm that results in a per-query run-time of O(k log k).

You can help by testing the new ```BenderRMQ``` data structure that has an O(n) space overhead and build cost and O(1) query cost. To read up on RMQ (Range Maximum Query), see [here](http://community.topcoder.com/tc?module=Static&d1=tutorials&d2=lowestCommonAncestor#A%20O%28N%29,%20O%281%29%20algorithm%20for%20the%20restricted%20RMQ) and [here](http://www.topcoder.com/tc?module=LinkTracking&link=http://www.math.tau.ac.il/~haimk/seminar04/LCA-seminar-modified.ppt&refer=)

lib-face is written using C++ and uses [libuv](https://github.com/joyent/libuv/) and the [joyent http-parser](https://github.com/joyent/http-parser/) to serve requests.

Visit the [Quick Start Guide](https://github.com/duckduckgo/cpp-libface/wiki/Quick-Start-Guide) to get started now!

See the [Benchmarks](https://github.com/duckduckgo/cpp-libface/wiki/Benchmarks)!

Read the [paper](http://dhruvbird.com/autocomplete.pdf)!