58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
# Copyright 2010-2017 Google
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
"""Rabbit + Pheasant puzzle.
|
|
|
|
This example is the same one described in
|
|
util/constraint/constraint_solver/constraint_solver.h
|
|
rewritten using the SWIG generated python wrapper.
|
|
Its purpose it to demonstrate how a simple example can be written in all the
|
|
flavors of constraint programming interfaces.
|
|
"""
|
|
from __future__ import print_function
|
|
from ortools.constraint_solver import pywrapcp
|
|
from ortools.constraint_solver import solver_parameters_pb2
|
|
|
|
|
|
def main():
|
|
parameters = pywrapcp.Solver.DefaultSolverParameters()
|
|
parameters.trace_search = True
|
|
|
|
# Create the solver.
|
|
solver = pywrapcp.Solver('rabbit+pheasant', parameters)
|
|
|
|
# Create the variables.
|
|
pheasant = solver.IntVar(0, 100, 'pheasant')
|
|
rabbit = solver.IntVar(0, 100, 'rabbit')
|
|
|
|
# Create the constraints.
|
|
solver.Add(pheasant + rabbit == 20)
|
|
solver.Add(pheasant * 2 + rabbit * 4 == 56)
|
|
|
|
# Create the search phase.
|
|
db = solver.Phase([rabbit, pheasant], solver.INT_VAR_DEFAULT,
|
|
solver.INT_VALUE_DEFAULT)
|
|
|
|
# And solve.
|
|
solver.NewSearch(db)
|
|
solver.NextSolution()
|
|
|
|
# Display output.
|
|
print(pheasant)
|
|
print(rabbit)
|
|
solver.EndSearch()
|
|
print(solver)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|