110 lines
3.1 KiB
Python
110 lines
3.1 KiB
Python
# Copyright 2010 Hakan Kjellerstrand hakank@bonetmail.com
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Eq 10 in Google CP Solver.
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Standard benchmark problem.
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Compare with the following models:
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* MiniZinc: http://hakank.org/minizinc/eq10.mzn
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* ECLiPSe: http://hakank.org/eclipse/eq10.ecl
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* SICStus: http://hakank.org/sicstus/eq10.pl
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This model was created by Hakan Kjellerstrand (hakank@bonetmail.com)
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Also see my other Google CP Solver models:
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http://www.hakank.org/google_or_tools/
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"""
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from ortools.constraint_solver import pywrapcp
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def main():
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# Create the solver.
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solver = pywrapcp.Solver("Eq 10")
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#
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# data
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#
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n = 7
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#
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# variables
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#
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X = [solver.IntVar(0, 10, "X(%i)" % i) for i in range(n)]
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X1, X2, X3, X4, X5, X6, X7 = X
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#
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# constraints
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#
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solver.Add(0 + 98527 * X1 + 34588 * X2 + 5872 * X3 + 59422 * X5 + 65159 * X7
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== 1547604 + 30704 * X4 + 29649 * X6)
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solver.Add(
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0 + 98957 * X2 + 83634 * X3 + 69966 * X4 + 62038 * X5 + 37164 * X6 + 85413 * X7 == 1823553 + 93989 *
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X1)
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solver.Add(900032 + 10949 * X1 + 77761 * X2 + 67052 * X5
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== 0 + 80197 * X3 + 61944 * X4 + 92964 * X6 + 44550 * X7)
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solver.Add(0 + 73947 * X1 + 84391 * X3 + 81310 * X5
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== 1164380 + 96253 * X2 + 44247 * X4 + 70582 * X6 + 33054 * X7)
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solver.Add(0 + 13057 * X3 + 42253 * X4 + 77527 * X5 + 96552 * X7
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== 1185471 + 60152 * X1 + 21103 * X2 + 97932 * X6)
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solver.Add(1394152 + 66920 * X1 + 55679 * X4 ==
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0 + 64234 * X2 + 65337 * X3 + 45581 * X5 + 67707 * X6 + 98038 * X7)
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solver.Add(0 + 68550 * X1 + 27886 * X2 + 31716 * X3 + 73597 * X4 + 38835 * X7
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== 279091 + 88963 * X5 + 76391 * X6)
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solver.Add(0 + 76132 * X2 + 71860 * X3 + 22770 * X4 + 68211 * X5 + 78587 * X6
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== 480923 + 48224 * X1 + 82817 * X7)
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solver.Add(519878 + 94198 * X2 + 87234 * X3 + 37498 * X4
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== 0 + 71583 * X1 + 25728 * X5 + 25495 * X6 + 70023 * X7)
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solver.Add(361921 + 78693 * X1 + 38592 * X5 + 38478 * X6
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== 0 + 94129 * X2 + 43188 * X3 + 82528 * X4 + 69025 * X7)
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#
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# search and result
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#
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db = solver.Phase(X,
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solver.INT_VAR_SIMPLE,
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solver.INT_VALUE_SIMPLE)
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solver.NewSearch(db)
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num_solutions = 0
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while solver.NextSolution():
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num_solutions += 1
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print "X:", [X[i].Value() for i in range(n)]
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print
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solver.EndSearch()
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print
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print "num_solutions:", num_solutions
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print "failures:", solver.Failures()
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print "branches:", solver.Branches()
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print "WallTime:", solver.WallTime()
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if __name__ == "__main__":
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main()
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