72 lines
2.9 KiB
C++
72 lines
2.9 KiB
C++
// Copyright 2010-2018 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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#ifndef OR_TOOLS_SAT_TABLE_H_
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#define OR_TOOLS_SAT_TABLE_H_
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#include <functional>
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#include <vector>
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#include "absl/types/span.h"
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#include "ortools/base/integral_types.h"
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#include "ortools/sat/integer.h"
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#include "ortools/sat/model.h"
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#include "ortools/sat/sat_base.h"
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namespace operations_research {
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namespace sat {
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// Enforces that the given tuple of variables is equal to one of the given
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// tuples. All the tuples must have the same size as var.size(), this is
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// Checked.
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void AddTableConstraint(absl::Span<const IntegerVariable> vars,
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std::vector<std::vector<int64>> tuples, Model* model);
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// Enforces that none of the given tuple appear.
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//
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// TODO(user): we could propagate more than what we currently do which is simply
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// adding one clause per tuples.
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void AddNegatedTableConstraint(absl::Span<const IntegerVariable> vars,
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std::vector<std::vector<int64>> tuples,
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Model* model);
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// Enforces that exactly one literal in line_literals is true, and that
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// all literals in the corresponding line of the literal_tuples matrix are true.
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// This constraint assumes that exactly one literal per column of the
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// literal_tuples matrix is true.
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std::function<void(Model*)> LiteralTableConstraint(
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const std::vector<std::vector<Literal>>& literal_tuples,
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const std::vector<Literal>& line_literals);
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// Given an automaton defined by a set of 3-tuples:
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// (state, transition_with_value_as_label, next_state)
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// this accepts the sequences of vars.size() variables that are recognized by
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// this automaton. That is:
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// - We start from the initial state.
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// - For each variable, we move along the transition labeled by this variable
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// value. Moreover, the variable must take a value that correspond to a
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// feasible transition.
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// - We only accept sequences that ends in one of the final states.
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//
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// We CHECK that there is only one possible transition for a state/value pair.
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// See the test for some examples.
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std::function<void(Model*)> TransitionConstraint(
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const std::vector<IntegerVariable>& vars,
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const std::vector<std::vector<int64>>& automaton, int64 initial_state,
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const std::vector<int64>& final_states);
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} // namespace sat
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} // namespace operations_research
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#endif // OR_TOOLS_SAT_TABLE_H_
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