A minimal FlatZinc interpreter in Picat that just meets the requirements for MiniZinc Challenge.

by Neng-Fa Zhou and Hakan Kjellerstrand, June 2020.

The MiniZinc library located in mznlib/ can be used to compile FlatZinc models compatible with this interpreter. You can compile these models directly by including the mznlib/ folder in your compilation command:

minizinc --solver mzn-fzn -I $PWD/mznlib zebra.mzn

Another option is to instantiate the picat.msc.in file (as picat.msc) by replacing the correct locations for the executable and the MiniZinc library. You can then use the picat.msc file as your solver:

minizinc --solver picat.msc zebra.mzn

Or include the folder that contains picat.msc on your MZN_SOLVER_PATH and use the identifier:

minizinc --solver picat zebra.mzn

The following examples illustrate the two different ways to use the interpreter to solve "zebra.fzn":

1. load and run

   Picat> load(fzn_picat_sat).
   Picat> main(["zebra"]).

2. run as a command-line

   picat fzn_picat_sat zebra