84 lines
2.8 KiB
Python
84 lines
2.8 KiB
Python
# Copyright 2010-2018 Google LLC
|
|
# 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.
|
|
|
|
"""Code for issue 46 in or-tools."""
|
|
|
|
from ortools.constraint_solver import pywrapcp
|
|
|
|
class AssignToStartMin(pywrapcp.PyDecisionBuilder):
|
|
|
|
def __init__(self, intervals):
|
|
self.__intervals = intervals
|
|
|
|
def Next(self, solver):
|
|
for interval in self.__intervals:
|
|
interval.SetStartMax(interval.StartMin())
|
|
return None
|
|
|
|
def NoSequence():
|
|
print 'NoSequence'
|
|
solver = pywrapcp.Solver('Ordo')
|
|
tasks = []
|
|
[tasks.append(solver.FixedDurationIntervalVar(0, 25, 5,
|
|
False, 'Tasks%i' %i)) for i in range(3)]
|
|
print tasks
|
|
disj = solver.DisjunctiveConstraint(tasks, 'Disjunctive')
|
|
solver.Add(disj)
|
|
collector = solver.AllSolutionCollector()
|
|
collector.Add(tasks)
|
|
intervalPhase = solver.Phase(tasks, solver.INTERVAL_DEFAULT)
|
|
solver.Solve(intervalPhase, [ collector])
|
|
print collector.SolutionCount()
|
|
for i in range(collector.SolutionCount()):
|
|
print "Solution " , i
|
|
print collector.ObjectiveValue(i)
|
|
print [collector.StartValue(i, tasks[j]) for j in range(3)]
|
|
print [collector.EndValue(i, tasks[j]) for j in range(3)]
|
|
|
|
def Sequence():
|
|
print 'Sequence'
|
|
solver = pywrapcp.Solver('Ordo')
|
|
tasks = []
|
|
[tasks.append(solver.FixedDurationIntervalVar(0, 25, 5, False,
|
|
'Tasks%i' %i))
|
|
for i in range(3)]
|
|
print tasks
|
|
disj = solver.DisjunctiveConstraint(tasks, 'Disjunctive')
|
|
solver.Add(disj)
|
|
sequence = []
|
|
sequence.append(disj.SequenceVar())
|
|
sequence[0].RankFirst(0)
|
|
collector = solver.AllSolutionCollector()
|
|
collector.Add(sequence)
|
|
collector.Add(tasks)
|
|
sequencePhase = solver.Phase(sequence, solver.SEQUENCE_DEFAULT)
|
|
intervalPhase = AssignToStartMin(tasks)
|
|
# intervalPhase = solver.Phase(tasks, solver.INTERVAL_DEFAULT)
|
|
mainPhase = solver.Compose([sequencePhase, intervalPhase])
|
|
solver.Solve(mainPhase, [ collector])
|
|
print collector.SolutionCount()
|
|
for i in range(collector.SolutionCount()):
|
|
print "Solution " , i
|
|
print collector.ObjectiveValue(i)
|
|
print [collector.StartValue(i, tasks[j]) for j in range(3)]
|
|
print [collector.EndValue(i, tasks[j]) for j in range(3)]
|
|
|
|
|
|
def main():
|
|
NoSequence()
|
|
Sequence()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|