https://github.com/gregable/pq-trees

General implementation of the PQ Tree algorithm.
https://github.com/gregable/pq-trees

Last synced: 8 months ago
JSON representation

General implementation of the PQ Tree algorithm.

• Host: GitHub
• URL: https://github.com/gregable/pq-trees
• Owner: Gregable
• Created: 2008-09-20T18:42:17.000Z (over 17 years ago)
• Default Branch: master
• Last Pushed: 2011-03-06T20:39:22.000Z (over 15 years ago)
• Last Synced: 2025-07-17T09:52:56.547Z (11 months ago)
• Language: C++
• Homepage: http://gregable.com/2008/11/pq-tree-algorithm-and-consecutive-ones.html
• Size: 353 KB
• Stars: 29
• Watchers: 5
• Forks: 7
• Open Issues: 1
• Metadata Files:
  • Readme: README

Awesome Lists containing this project

README

          
A C++ implementation of Booth & Lueker's PQ-Tree algorithm.

Kellog S. Booth, George S. Lueker, Testing for the consecutive ones property,

interval graphs, and graph planarity using PQ-tree algorithms, Journal of

Computer and Systems Sciences, 13(3) (1976) 335-379.

IMPORTANT NOTE: This code currently is known to be buggy on some rare inputs.  A believed to be correct, but harder to use version of this code can be found as a library within BiVoC: https://bioinformatics.cs.vt.edu/~murali/papers/bivoc/

Description of files:

The main file for this library is pqtree.h.  It contains an API that can be

used by client code for dealing with PQ-Trees.  There are two binaries:

fuzztest and pqtest.

pqtest runs the pqtree code for one example set of reductions on a single tree, printing the state of the tree at every step.  This illustrates how the pqtree is built.

fuzztest generates a large random set of possible reductions and runs them

against the library making sure that it never returns false or segfaults.

Usage:

Primarily, this is intended to be used as a library, not a binary.  But you can

still compile and run the binaries |pqtest| and |fuzztest|.  My personal

recommendation would be to compile with scons, http://scons.org/.  To do so,

run:

$ scons

$ ./fuzztest

$ ./pqtest

Alternatively, I also handily include the tried and true MakeFile, so if you

don't have scons on your system and don't feel like installing it, instead just

run:

$ make

$ ./fuzztest

$ ./pqtest