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fix: updated README.md

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rubengmartins committed Sep 19, 2018
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# README for the Open-WBO MaxSAT Solver
## Version 2.1 -- September 2018
# Open-WBO MaxSAT Solver
## Version 2.1 - September 2018

Open-WBO is an extensible and modular open-source MaxSAT Solver.
Open-WBO was one of the best solvers in the partial MaxSAT categories at
MaxSAT Evaluations 2014, 2015, 2016 and 2017 and in the decision and
optimization for SMALLINT categories at PB Evaluation 2016.

## MaxSAT Evaluation 2018
### The default algorithms used by Open-WBO in the complete track are:
### unweighted: Part-MSU3 ; weighted: OLL
The default algorithms used by Open-WBO in the complete track are:
* unweighted: Part-MSU3
* weighted: OLL

Usage of the solver:
./open-wbo [options] <input-file>
@@ -65,18 +66,20 @@ The following options are available in Open-WBO:
Open-WBO follows the standard output of MaxSAT solvers:
* Comments ("c " lines)
* Solution Status ("s " line):
..* s OPTIMUM FOUND : an optimum solution was found
..* s UNSATISFIABLE : the hard clauses are unsatisfiable
..* s SATISFIABLE : a solution was found but optimality was not proven
* s OPTIMUM FOUND : an optimum solution was found
* s UNSATISFIABLE : the hard clauses are unsatisfiable
* s SATISFIABLE : a solution was found but optimality was not proven
* Solution Cost Line ("o " lines):
..* This represents the cost of the best solution found by the solver. The cost
of a solution is given by the sum of the weights of the unsatisfied soft clause.
* This represents the cost of the best solution found by the solver. The cost
of a solution is given by the sum of the weights of the unsatisfied soft clause.
* Solution Values (Truth Assignment) ("v " lines):
..* This represents the truth assignment (true/false) assigned to each variable.
A literal is denoted by an integer that identifies the variable and the negation
of a literal is denoted by a minus sign immediately followed by the integer of
the variable.
* This represents the truth assignment (true/false) assigned to each variable.
A literal is denoted by an integer that identifies the variable and the negation
of a literal is denoted by a minus sign immediately followed by the integer of
the variable.
> Authors: Ruben Martins, Vasco Manquinho, Ines Lynce
> Contributors: Miguel Neves, Norbert Manthey, Saurabh Joshi, Mikolas Janota
> To contact the authors please send an email to: open-wbo@sat.inesc-id.pt

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