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pack.cc
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pack.cc
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// Copyright 2010-2024 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.
// Packing constraints
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/strings/str_format.h"
#include "absl/strings/str_join.h"
#include "ortools/base/logging.h"
#include "ortools/base/types.h"
#include "ortools/constraint_solver/constraint_solver.h"
#include "ortools/constraint_solver/constraint_solveri.h"
namespace operations_research {
// ---------- Dimension ----------
class Dimension : public BaseObject {
public:
explicit Dimension(Solver* const s, Pack* const pack)
: solver_(s), pack_(pack) {}
~Dimension() override {}
virtual void Post() = 0;
virtual void InitialPropagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& undecided) = 0;
virtual void InitialPropagateUnassigned(
const std::vector<int>& assigned, const std::vector<int>& unassigned) = 0;
virtual void EndInitialPropagate() = 0;
virtual void Propagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& removed) = 0;
virtual void PropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) = 0;
virtual void EndPropagate() = 0;
std::string DebugString() const override { return "Dimension"; }
virtual void Accept(ModelVisitor* visitor) const = 0;
Solver* solver() const { return solver_; }
bool IsUndecided(int var_index, int bin_index) const {
return pack_->IsUndecided(var_index, bin_index);
}
bool IsPossible(int var_index, int bin_index) const {
return pack_->IsPossible(var_index, bin_index);
}
IntVar* AssignVar(int var_index, int bin_index) const {
return pack_->AssignVar(var_index, bin_index);
}
void SetImpossible(int var_index, int bin_index) {
pack_->SetImpossible(var_index, bin_index);
}
void Assign(int var_index, int bin_index) {
pack_->Assign(var_index, bin_index);
}
bool IsAssignedStatusKnown(int var_index) const {
return pack_->IsAssignedStatusKnown(var_index);
}
void SetAssigned(int var_index) { pack_->SetAssigned(var_index); }
void SetUnassigned(int var_index) { pack_->SetUnassigned(var_index); }
void RemoveAllPossibleFromBin(int bin_index) {
pack_->RemoveAllPossibleFromBin(bin_index);
}
void AssignAllPossibleToBin(int bin_index) {
pack_->AssignAllPossibleToBin(bin_index);
}
void AssignFirstPossibleToBin(int bin_index) {
pack_->AssignFirstPossibleToBin(bin_index);
}
void AssignAllRemainingItems() { pack_->AssignAllRemainingItems(); }
void UnassignAllRemainingItems() { pack_->UnassignAllRemainingItems(); }
private:
Solver* const solver_;
Pack* const pack_;
};
// ----- Pack -----
Pack::Pack(Solver* const s, const std::vector<IntVar*>& vars,
int number_of_bins)
: Constraint(s),
vars_(vars),
bins_(number_of_bins),
unprocessed_(new RevBitMatrix(bins_ + 1, vars_.size())),
forced_(bins_ + 1),
removed_(bins_ + 1),
holes_(vars_.size()),
stamp_(uint64_t{0}),
demon_(nullptr),
in_process_(false) {
for (int i = 0; i < vars_.size(); ++i) {
holes_[i] = vars_[i]->MakeHoleIterator(true);
}
}
Pack::~Pack() {}
void Pack::Post() {
for (int i = 0; i < vars_.size(); ++i) {
IntVar* const var = vars_[i];
if (!var->Bound()) {
Demon* const d = MakeConstraintDemon1(solver(), this, &Pack::OneDomain,
"OneDomain", i);
var->WhenDomain(d);
}
}
for (int i = 0; i < dims_.size(); ++i) {
dims_[i]->Post();
}
demon_ = solver()->RegisterDemon(MakeDelayedConstraintDemon0(
solver(), this, &Pack::Propagate, "Propagate"));
}
void Pack::ClearAll() {
for (int bin_index = 0; bin_index <= bins_; ++bin_index) {
forced_[bin_index].clear();
removed_[bin_index].clear();
}
to_set_.clear();
to_unset_.clear();
in_process_ = false;
stamp_ = solver()->fail_stamp();
}
void Pack::PropagateDelayed() {
for (int i = 0; i < to_set_.size(); ++i) {
vars_[to_set_[i].first]->SetValue(to_set_[i].second);
}
for (int i = 0; i < to_unset_.size(); ++i) {
vars_[to_unset_[i].first]->RemoveValue(to_unset_[i].second);
}
}
// A reversibly-allocable container for the data needed in
// Pack::InitialPropagate()
namespace {
class InitialPropagateData : public BaseObject {
public:
explicit InitialPropagateData(size_t num_bins)
: BaseObject(), undecided_(num_bins) {}
void PushAssigned(int index) { assigned_.push_back(index); }
void PushUnassigned(int index) { unassigned_.push_back(index); }
void PushUndecided(int bin, int index) {
undecided_.at(bin).push_back(index);
}
const std::vector<int>& undecided(int bin) const {
return undecided_.at(bin);
}
const std::vector<int>& assigned() const { return assigned_; }
const std::vector<int>& unassigned() const { return unassigned_; }
std::string DebugString() const override { return "InitialPropagateData"; }
private:
std::vector<std::vector<int>> undecided_;
std::vector<int> unassigned_;
std::vector<int> assigned_;
};
} // namespace
void Pack::InitialPropagate() {
const bool need_context = solver()->InstrumentsVariables();
ClearAll();
Solver* const s = solver();
in_process_ = true;
InitialPropagateData* data = s->RevAlloc(new InitialPropagateData(bins_));
for (int var_index = 0; var_index < vars_.size(); ++var_index) {
IntVar* const var = vars_[var_index];
var->SetRange(0, bins_); // bins_ -> item is not assigned to a bin.
if (var->Bound()) {
const int64_t value = var->Min();
if (value < bins_) {
forced_[value].push_back(var_index);
data->PushAssigned(var_index);
} else {
data->PushUnassigned(var_index);
}
} else {
DCHECK_GT(bins_, var->Min())
<< "The variable maximum should be at most " << bins_
<< ", and it should be unbound, so its min is expected to be less "
<< "than " << bins_;
if (var->Max() < bins_) {
data->PushAssigned(var_index);
}
std::unique_ptr<IntVarIterator> it(var->MakeDomainIterator(false));
for (const int64_t value : InitAndGetValues(it.get())) {
if (value >= 0 && value <= bins_) {
unprocessed_->SetToOne(s, value, var_index);
if (value != bins_) {
data->PushUndecided(value, var_index);
}
}
}
}
}
for (int bin_index = 0; bin_index < bins_; ++bin_index) {
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(
absl::StrFormat("Pack(bin %d, forced = [%s], undecided = [%s])",
bin_index, absl::StrJoin(forced_[bin_index], ", "),
absl::StrJoin(data->undecided(bin_index), ", ")));
}
for (int dim_index = 0; dim_index < dims_.size(); ++dim_index) {
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(absl::StrFormat(
"InitialProgateDimension(%s)", dims_[dim_index]->DebugString()));
}
dims_[dim_index]->InitialPropagate(bin_index, forced_[bin_index],
data->undecided(bin_index));
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
}
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
}
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(
absl::StrFormat("Pack(assigned = [%s], unassigned = [%s])",
absl::StrJoin(data->assigned(), ", "),
absl::StrJoin(data->unassigned(), ", ")));
}
for (int dim_index = 0; dim_index < dims_.size(); ++dim_index) {
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(absl::StrFormat(
"InitialProgateDimension(%s)", dims_[dim_index]->DebugString()));
}
dims_[dim_index]->InitialPropagateUnassigned(data->assigned(),
data->unassigned());
dims_[dim_index]->EndInitialPropagate();
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
}
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
PropagateDelayed();
ClearAll();
}
void Pack::Propagate() {
const bool need_context = solver()->InstrumentsVariables();
in_process_ = true;
DCHECK_EQ(stamp_, solver()->fail_stamp());
for (int bin_index = 0; bin_index < bins_; ++bin_index) {
if (!removed_[bin_index].empty() || !forced_[bin_index].empty()) {
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(
absl::StrFormat("Pack(bin %d, forced = [%s], removed = [%s])",
bin_index, absl::StrJoin(forced_[bin_index], ", "),
absl::StrJoin(removed_[bin_index], ", ")));
}
for (int dim_index = 0; dim_index < dims_.size(); ++dim_index) {
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(absl::StrFormat(
"ProgateDimension(%s)", dims_[dim_index]->DebugString()));
}
dims_[dim_index]->Propagate(bin_index, forced_[bin_index],
removed_[bin_index]);
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
}
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
}
}
if (!removed_[bins_].empty() || !forced_[bins_].empty()) {
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(
absl::StrFormat("Pack(removed = [%s], forced = [%s])",
absl::StrJoin(removed_[bins_], ", "),
absl::StrJoin(forced_[bins_], ", ")));
}
for (int dim_index = 0; dim_index < dims_.size(); ++dim_index) {
if (need_context) {
solver()->GetPropagationMonitor()->PushContext(absl::StrFormat(
"ProgateDimension(%s)", dims_[dim_index]->DebugString()));
}
dims_[dim_index]->PropagateUnassigned(removed_[bins_], forced_[bins_]);
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
}
if (need_context) {
solver()->GetPropagationMonitor()->PopContext();
}
}
for (int dim_index = 0; dim_index < dims_.size(); ++dim_index) {
dims_[dim_index]->EndPropagate();
}
PropagateDelayed();
ClearAll();
}
void Pack::OneDomain(int var_index) {
// TODO(user): We know var ranges from 0 to bins_. There are lots
// of simplifications possible.
Solver* const s = solver();
const uint64_t current_stamp = s->fail_stamp();
if (stamp_ < current_stamp) {
stamp_ = current_stamp;
ClearAll();
}
IntVar* const var = vars_[var_index];
bool bound = var->Bound();
const int64_t oldmin = var->OldMin();
const int64_t oldmax = var->OldMax();
const int64_t vmin = var->Min();
const int64_t vmax = var->Max();
for (int64_t value = std::max(oldmin, int64_t{0});
value < std::min(vmin, bins_ + int64_t{1}); ++value) {
if (unprocessed_->IsSet(value, var_index)) {
unprocessed_->SetToZero(s, value, var_index);
removed_[value].push_back(var_index);
}
}
if (!bound) {
for (const int64_t value : InitAndGetValues(holes_[var_index])) {
if (value >= std::max(int64_t{0}, vmin) &&
value <= std::min(static_cast<int64_t>(bins_), vmax)) {
DCHECK(unprocessed_->IsSet(value, var_index));
unprocessed_->SetToZero(s, value, var_index);
removed_[value].push_back(var_index);
}
}
}
for (int64_t value = std::max(vmax + 1, int64_t{0});
value <= std::min(oldmax, static_cast<int64_t>(bins_)); ++value) {
if (unprocessed_->IsSet(value, var_index)) {
unprocessed_->SetToZero(s, value, var_index);
removed_[value].push_back(var_index);
}
}
if (bound) {
unprocessed_->SetToZero(s, var->Min(), var_index);
forced_[var->Min()].push_back(var_index);
}
EnqueueDelayedDemon(demon_);
}
std::string Pack::DebugString() const {
std::string result = "Pack([";
for (int i = 0; i < vars_.size(); ++i) {
result += vars_[i]->DebugString() + " ";
}
result += "], dimensions = [";
for (int i = 0; i < dims_.size(); ++i) {
result += dims_[i]->DebugString() + " ";
}
absl::StrAppendFormat(&result, "], bins = %d)", bins_);
return result;
}
void Pack::Accept(ModelVisitor* const visitor) const {
visitor->BeginVisitConstraint(ModelVisitor::kPack, this);
visitor->VisitIntegerVariableArrayArgument(ModelVisitor::kVarsArgument,
vars_);
visitor->VisitIntegerArgument(ModelVisitor::kSizeArgument, bins_);
for (int i = 0; i < dims_.size(); ++i) {
dims_[i]->Accept(visitor);
}
visitor->EndVisitConstraint(ModelVisitor::kPack, this);
}
bool Pack::IsUndecided(int var_index, int bin_index) const {
return unprocessed_->IsSet(bin_index, var_index);
}
void Pack::SetImpossible(int var_index, int bin_index) {
if (IsInProcess()) {
to_unset_.push_back(std::make_pair(var_index, bin_index));
} else {
vars_[var_index]->RemoveValue(bin_index);
}
}
void Pack::Assign(int var_index, int bin_index) {
if (IsInProcess()) {
to_set_.push_back(std::make_pair(var_index, bin_index));
} else {
vars_[var_index]->SetValue(bin_index);
}
}
bool Pack::IsAssignedStatusKnown(int var_index) const {
return !unprocessed_->IsSet(bins_, var_index);
}
bool Pack::IsPossible(int var_index, int bin_index) const {
return vars_[var_index]->Contains(bin_index);
}
IntVar* Pack::AssignVar(int var_index, int bin_index) const {
return solver()->MakeIsEqualCstVar(vars_[var_index], bin_index);
}
void Pack::SetAssigned(int var_index) {
if (IsInProcess()) {
to_unset_.push_back(std::make_pair(var_index, bins_));
} else {
vars_[var_index]->RemoveValue(bins_);
}
}
void Pack::SetUnassigned(int var_index) {
if (IsInProcess()) {
to_set_.push_back(std::make_pair(var_index, bins_));
} else {
vars_[var_index]->SetValue(bins_);
}
}
bool Pack::IsInProcess() const {
return in_process_ && (solver()->fail_stamp() == stamp_);
}
void Pack::RemoveAllPossibleFromBin(int bin_index) {
int var_index = unprocessed_->GetFirstBit(bin_index, 0);
while (var_index != -1 && var_index < vars_.size()) {
SetImpossible(var_index, bin_index);
var_index = var_index == vars_.size() - 1
? -1
: unprocessed_->GetFirstBit(bin_index, var_index + 1);
}
}
void Pack::AssignAllPossibleToBin(int bin_index) {
int var_index = unprocessed_->GetFirstBit(bin_index, 0);
while (var_index != -1 && var_index < vars_.size()) {
Assign(var_index, bin_index);
var_index = var_index == vars_.size() - 1
? -1
: unprocessed_->GetFirstBit(bin_index, var_index + 1);
}
}
void Pack::AssignFirstPossibleToBin(int bin_index) {
int var_index = unprocessed_->GetFirstBit(bin_index, 0);
if (var_index != -1 && var_index < vars_.size()) {
Assign(var_index, bin_index);
}
}
void Pack::AssignAllRemainingItems() {
int var_index = unprocessed_->GetFirstBit(bins_, 0);
while (var_index != -1 && var_index < vars_.size()) {
SetAssigned(var_index);
var_index = var_index == vars_.size() - 1
? -1
: unprocessed_->GetFirstBit(bins_, var_index + 1);
}
}
void Pack::UnassignAllRemainingItems() {
int var_index = unprocessed_->GetFirstBit(bins_, 0);
while (var_index != -1 && var_index < vars_.size()) {
SetUnassigned(var_index);
var_index = var_index == vars_.size() - 1
? -1
: unprocessed_->GetFirstBit(bins_, var_index + 1);
}
}
// ----- Dimension -----
// ----- Class Dimension Less Than Constant -----
namespace {
struct WeightContainer {
int index;
int64_t weight;
WeightContainer(int i, int64_t w) : index(i), weight(w) {}
bool operator<(const WeightContainer& c) const { return (weight < c.weight); }
};
void SortWeightVector(std::vector<int>* const indices,
std::vector<WeightContainer>* const to_sort) {
std::sort(to_sort->begin(), to_sort->end());
for (int index = 0; index < to_sort->size(); ++index) {
(*indices)[index] = (*to_sort)[index].index;
}
indices->resize(to_sort->size());
}
void SortIndexByWeight(std::vector<int>* const indices,
const std::vector<int64_t>& weights) {
std::vector<WeightContainer> to_sort;
for (int index = 0; index < indices->size(); ++index) {
if (weights[index] != 0) {
to_sort.push_back(WeightContainer((*indices)[index], weights[index]));
}
}
SortWeightVector(indices, &to_sort);
}
void SortIndexByWeight(std::vector<int>* const indices,
const Solver::IndexEvaluator1& weights) {
std::vector<WeightContainer> to_sort;
for (int index = 0; index < indices->size(); ++index) {
const int w = weights(index);
if (w != 0) {
to_sort.push_back(WeightContainer((*indices)[index], w));
}
}
SortWeightVector(indices, &to_sort);
}
void SortIndexByWeight(std::vector<int>* const indices,
const Solver::IndexEvaluator2& weights, int bin_index) {
std::vector<WeightContainer> to_sort;
for (int index = 0; index < indices->size(); ++index) {
const int w = weights(index, bin_index);
if (w != 0) {
to_sort.push_back(WeightContainer((*indices)[index], w));
}
}
SortWeightVector(indices, &to_sort);
}
class DimensionLessThanConstant : public Dimension {
public:
DimensionLessThanConstant(Solver* const s, Pack* const p,
const std::vector<int64_t>& weights,
const std::vector<int64_t>& upper_bounds)
: Dimension(s, p),
vars_count_(weights.size()),
weights_(weights),
bins_count_(upper_bounds.size()),
upper_bounds_(upper_bounds),
first_unbound_backward_vector_(bins_count_, 0),
sum_of_bound_variables_vector_(bins_count_, 0LL),
ranked_(vars_count_) {
for (int i = 0; i < vars_count_; ++i) {
ranked_[i] = i;
}
SortIndexByWeight(&ranked_, weights_);
}
~DimensionLessThanConstant() override {}
void Post() override {}
void PushFromTop(int bin_index) {
const int64_t slack =
upper_bounds_[bin_index] - sum_of_bound_variables_vector_[bin_index];
if (slack < 0) {
solver()->Fail();
}
int last_unbound = first_unbound_backward_vector_[bin_index];
for (; last_unbound >= 0; --last_unbound) {
const int var_index = ranked_[last_unbound];
if (IsUndecided(var_index, bin_index)) {
if (weights_[var_index] > slack) {
SetImpossible(var_index, bin_index);
} else {
break;
}
}
}
first_unbound_backward_vector_.SetValue(solver(), bin_index, last_unbound);
}
void InitialPropagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& undecided) override {
Solver* const s = solver();
int64_t sum = 0LL;
for (const int value : forced) {
sum += weights_[value];
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, sum);
first_unbound_backward_vector_.SetValue(s, bin_index, ranked_.size() - 1);
PushFromTop(bin_index);
}
void EndInitialPropagate() override {}
void Propagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& removed) override {
if (!forced.empty()) {
Solver* const s = solver();
int64_t sum = sum_of_bound_variables_vector_[bin_index];
for (const int value : forced) {
sum += weights_[value];
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, sum);
PushFromTop(bin_index);
}
}
void InitialPropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {
}
void PropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {}
void EndPropagate() override {}
void Accept(ModelVisitor* const visitor) const override {
visitor->BeginVisitExtension(ModelVisitor::kUsageLessConstantExtension);
visitor->VisitIntegerArrayArgument(ModelVisitor::kCoefficientsArgument,
weights_);
visitor->VisitIntegerArrayArgument(ModelVisitor::kValuesArgument,
upper_bounds_);
visitor->EndVisitExtension(ModelVisitor::kUsageLessConstantExtension);
}
private:
const int vars_count_;
const std::vector<int64_t> weights_;
const int bins_count_;
const std::vector<int64_t> upper_bounds_;
RevArray<int> first_unbound_backward_vector_;
RevArray<int64_t> sum_of_bound_variables_vector_;
std::vector<int> ranked_;
};
class DimensionSumCallbackLessThanConstant : public Dimension {
public:
DimensionSumCallbackLessThanConstant(Solver* const s, Pack* const p,
const Solver::IndexEvaluator1& weights,
int vars_count,
const std::vector<int64_t>& upper_bounds)
: Dimension(s, p),
vars_count_(vars_count),
weights_(weights),
bins_count_(upper_bounds.size()),
upper_bounds_(upper_bounds),
first_unbound_backward_vector_(bins_count_, 0),
sum_of_bound_variables_vector_(bins_count_, 0LL),
ranked_(vars_count_) {
DCHECK(weights);
DCHECK_GT(vars_count, 0);
for (int i = 0; i < vars_count_; ++i) {
ranked_[i] = i;
}
SortIndexByWeight(&ranked_, weights_);
}
~DimensionSumCallbackLessThanConstant() override {}
void Post() override {}
void PushFromTop(int bin_index) {
const int64_t slack =
upper_bounds_[bin_index] - sum_of_bound_variables_vector_[bin_index];
if (slack < 0) {
solver()->Fail();
}
int last_unbound = first_unbound_backward_vector_[bin_index];
for (; last_unbound >= 0; --last_unbound) {
const int var_index = ranked_[last_unbound];
if (IsUndecided(var_index, bin_index)) {
if (weights_(var_index) > slack) {
SetImpossible(var_index, bin_index);
} else {
break;
}
}
}
first_unbound_backward_vector_.SetValue(solver(), bin_index, last_unbound);
}
void InitialPropagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& undecided) override {
Solver* const s = solver();
int64_t sum = 0LL;
for (const int value : forced) {
sum += weights_(value);
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, sum);
first_unbound_backward_vector_.SetValue(s, bin_index, ranked_.size() - 1);
PushFromTop(bin_index);
}
void EndInitialPropagate() override {}
void Propagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& removed) override {
if (!forced.empty()) {
Solver* const s = solver();
int64_t sum = sum_of_bound_variables_vector_[bin_index];
for (const int value : forced) {
sum += weights_(value);
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, sum);
PushFromTop(bin_index);
}
}
void InitialPropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {
}
void PropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {}
void EndPropagate() override {}
void Accept(ModelVisitor* const visitor) const override {
visitor->BeginVisitExtension(ModelVisitor::kUsageLessConstantExtension);
// TODO(user) : Visit weight correctly.
// visitor->VisitIntegerArrayArgument(ModelVisitor::kCoefficientsArgument,
// weights_);
visitor->VisitIntegerArrayArgument(ModelVisitor::kValuesArgument,
upper_bounds_);
visitor->EndVisitExtension(ModelVisitor::kUsageLessConstantExtension);
}
private:
const int vars_count_;
Solver::IndexEvaluator1 weights_;
const int bins_count_;
const std::vector<int64_t> upper_bounds_;
RevArray<int> first_unbound_backward_vector_;
RevArray<int64_t> sum_of_bound_variables_vector_;
std::vector<int> ranked_;
};
class DimensionLessThanConstantCallback2 : public Dimension {
public:
DimensionLessThanConstantCallback2(Solver* const s, Pack* const p,
const Solver::IndexEvaluator2& weights,
int vars_count,
const std::vector<int64_t>& upper_bounds)
: Dimension(s, p),
vars_count_(vars_count),
weights_(weights),
bins_count_(upper_bounds.size()),
upper_bounds_(upper_bounds),
first_unbound_backward_vector_(bins_count_, 0),
sum_of_bound_variables_vector_(bins_count_, 0LL),
ranked_(bins_count_) {
DCHECK(weights);
DCHECK_GT(vars_count, 0);
for (int b = 0; b < bins_count_; ++b) {
ranked_[b].resize(vars_count);
for (int i = 0; i < vars_count_; ++i) {
ranked_[b][i] = i;
}
SortIndexByWeight(&ranked_[b], weights_, b);
}
}
~DimensionLessThanConstantCallback2() override {}
void Post() override {}
void PushFromTop(int bin_index) {
const int64_t slack =
upper_bounds_[bin_index] - sum_of_bound_variables_vector_[bin_index];
if (slack < 0) {
solver()->Fail();
}
int last_unbound = first_unbound_backward_vector_[bin_index];
for (; last_unbound >= 0; --last_unbound) {
const int var_index = ranked_[bin_index][last_unbound];
if (IsUndecided(var_index, bin_index)) {
if (weights_(var_index, bin_index) > slack) {
SetImpossible(var_index, bin_index);
} else {
break;
}
}
}
first_unbound_backward_vector_.SetValue(solver(), bin_index, last_unbound);
}
void InitialPropagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& undecided) override {
Solver* const s = solver();
int64_t sum = 0LL;
for (const int value : forced) {
sum += weights_(value, bin_index);
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, sum);
first_unbound_backward_vector_.SetValue(s, bin_index,
ranked_[bin_index].size() - 1);
PushFromTop(bin_index);
}
void EndInitialPropagate() override {}
void Propagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& removed) override {
if (!forced.empty()) {
Solver* const s = solver();
int64_t sum = sum_of_bound_variables_vector_[bin_index];
for (const int value : forced) {
sum += weights_(value, bin_index);
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, sum);
PushFromTop(bin_index);
}
}
void InitialPropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {
}
void PropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {}
void EndPropagate() override {}
void Accept(ModelVisitor* const visitor) const override {
visitor->BeginVisitExtension(ModelVisitor::kUsageLessConstantExtension);
// TODO(user): Visit weight correctly
// visitor->VisitIntegerArrayArgument(ModelVisitor::kCoefficientsArgument,
// weights_);
visitor->VisitIntegerArrayArgument(ModelVisitor::kValuesArgument,
upper_bounds_);
visitor->EndVisitExtension(ModelVisitor::kUsageLessConstantExtension);
}
private:
const int vars_count_;
Solver::IndexEvaluator2 weights_;
const int bins_count_;
const std::vector<int64_t> upper_bounds_;
RevArray<int> first_unbound_backward_vector_;
RevArray<int64_t> sum_of_bound_variables_vector_;
std::vector<std::vector<int>> ranked_;
};
class DimensionWeightedSumEqVar : public Dimension {
public:
class VarDemon : public Demon {
public:
VarDemon(DimensionWeightedSumEqVar* const dim, int index)
: dim_(dim), index_(index) {}
~VarDemon() override {}
void Run(Solver* const s) override { dim_->PushFromTop(index_); }
private:
DimensionWeightedSumEqVar* const dim_;
const int index_;
};
DimensionWeightedSumEqVar(Solver* const s, Pack* const p,
const std::vector<int64_t>& weights,
const std::vector<IntVar*>& loads)
: Dimension(s, p),
vars_count_(weights.size()),
weights_(weights),
bins_count_(loads.size()),
loads_(loads),
first_unbound_backward_vector_(bins_count_, 0),
sum_of_bound_variables_vector_(bins_count_, 0LL),
sum_of_all_variables_vector_(bins_count_, 0LL),
ranked_(vars_count_) {
DCHECK_GT(vars_count_, 0);
DCHECK_GT(bins_count_, 0);
for (int i = 0; i < vars_count_; ++i) {
ranked_[i] = i;
}
SortIndexByWeight(&ranked_, weights_);
}
~DimensionWeightedSumEqVar() override {}
std::string DebugString() const override {
return "DimensionWeightedSumEqVar";
}
void Post() override {
for (int i = 0; i < bins_count_; ++i) {
Demon* const d = solver()->RevAlloc(new VarDemon(this, i));
loads_[i]->WhenRange(d);
}
}
void PushFromTop(int bin_index) {
IntVar* const load = loads_[bin_index];
const int64_t sum_min = sum_of_bound_variables_vector_[bin_index];
const int64_t sum_max = sum_of_all_variables_vector_[bin_index];
load->SetRange(sum_min, sum_max);
const int64_t slack_up = load->Max() - sum_min;
const int64_t slack_down = sum_max - load->Min();
DCHECK_GE(slack_down, 0);
DCHECK_GE(slack_up, 0);
int last_unbound = first_unbound_backward_vector_[bin_index];
for (; last_unbound >= 0; --last_unbound) {
const int var_index = ranked_[last_unbound];
const int64_t weight = weights_[var_index];
if (IsUndecided(var_index, bin_index)) {
if (weight > slack_up) {
SetImpossible(var_index, bin_index);
} else if (weight > slack_down) {
Assign(var_index, bin_index);
} else {
break;
}
}
}
first_unbound_backward_vector_.SetValue(solver(), bin_index, last_unbound);
}
void InitialPropagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& undecided) override {
Solver* const s = solver();
int64_t sum = 0LL;
for (const int value : forced) {
sum += weights_[value];
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, sum);
for (const int value : undecided) {
sum += weights_[value];
}
sum_of_all_variables_vector_.SetValue(s, bin_index, sum);
first_unbound_backward_vector_.SetValue(s, bin_index, ranked_.size() - 1);
PushFromTop(bin_index);
}
void EndInitialPropagate() override {}
void Propagate(int bin_index, const std::vector<int>& forced,
const std::vector<int>& removed) override {
Solver* const s = solver();
int64_t down = sum_of_bound_variables_vector_[bin_index];
for (const int value : forced) {
down += weights_[value];
}
sum_of_bound_variables_vector_.SetValue(s, bin_index, down);
int64_t up = sum_of_all_variables_vector_[bin_index];
for (const int value : removed) {
up -= weights_[value];
}
sum_of_all_variables_vector_.SetValue(s, bin_index, up);
PushFromTop(bin_index);
}
void InitialPropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {
}
void PropagateUnassigned(const std::vector<int>& assigned,
const std::vector<int>& unassigned) override {}
void EndPropagate() override {}
void Accept(ModelVisitor* const visitor) const override {
visitor->BeginVisitExtension(ModelVisitor::kUsageEqualVariableExtension);
visitor->VisitIntegerArrayArgument(ModelVisitor::kCoefficientsArgument,
weights_);
visitor->VisitIntegerVariableArrayArgument(ModelVisitor::kVarsArgument,
loads_);
visitor->EndVisitExtension(ModelVisitor::kUsageEqualVariableExtension);
}
private:
const int vars_count_;
const std::vector<int64_t> weights_;
const int bins_count_;
const std::vector<IntVar*> loads_;
RevArray<int> first_unbound_backward_vector_;
RevArray<int64_t> sum_of_bound_variables_vector_;
RevArray<int64_t> sum_of_all_variables_vector_;
std::vector<int> ranked_;
};
class DimensionWeightedCallback2SumEqVar : public Dimension {
public:
class VarDemon : public Demon {
public:
VarDemon(DimensionWeightedCallback2SumEqVar* const dim, int index)
: dim_(dim), index_(index) {}
~VarDemon() override {}