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"Dumb" CNF SAT Solvers

Bart Massey

This is the dumbest and simplest possible implementation of some SAT solvers. Only the minimum required algorithm is implemented, and no attention whatsoever has been paid to efficiency.

This Python 3 codebase comprises three tools:

  • rand3sat.py: Produce a random 3-CNF-SAT instance on standard output.

  • dumbdpll.py: Solve a CNF-SAT instance using the DPLL Algorithm (but without unit propagation or pure literal removal).

  • dumbwsat.py: Try to solve a satisfiable CNF-SAT instance using WalkSAT.

Programs input and output in DIMACS 2009 format. Please run with --help for program usage.

Four sample instances are supplied: two SAT and two UNSAT.

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