61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
#!/usr/bin/env python3
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# Copyright 2010-2022 Google LLC
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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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# [START program]
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"""A simple knapsack problem."""
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# [START import]
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from ortools.algorithms.python import knapsack_solver
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# [END import]
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def main():
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# Create the solver.
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# [START solver]
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solver = knapsack_solver.KnapsackSolver(
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knapsack_solver.SolverType.KNAPSACK_DYNAMIC_PROGRAMMING_SOLVER,
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"test",
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)
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# [END solver]
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# [START data]
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weights = [
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# fmt:off
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[565, 406, 194, 130, 435, 367, 230, 315, 393, 125, 670, 892, 600, 293, 712, 147, 421, 255],
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# fmt:on
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]
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capacities = [850]
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values = weights[0]
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# [END data]
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# [START solve]
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solver.init(values, weights, capacities)
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computed_value = solver.solve()
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# [END solve]
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# [START print_solution]
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packed_items = [
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x for x in range(0, len(weights[0])) if solver.best_solution_contains(x)
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]
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packed_weights = [weights[0][i] for i in packed_items]
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print("Packed items: ", packed_items)
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print("Packed weights: ", packed_weights)
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print("Total weight (same as total value): ", computed_value)
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# [END print_solution]
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if __name__ == "__main__":
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main()
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# [END program]
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