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reformat code

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This commit is contained in:
Laurent Perron
2018-09-20 13:56:50 +02:00
parent b1da9320f9
commit b4e8d89fe5
11 changed files with 346 additions and 300 deletions
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1
examples/python/balance_group_sat.py
View File

@@ -10,7 +10,6 @@
# 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.
"""We are trying to group items in equal sized groups.
Each item has a color and a value. We want the sum of values of each group to

438
ortools/sat/csharp/CpSolver.cs
View File

@@ -11,254 +11,256 @@
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Google.OrTools.Sat
{
using System;
using System.Collections.Generic;
public class CpSolverSolutionCallback : SolutionCallback
{
public long Value(IntegerExpression e)
{
List<IntegerExpression> exprs = new List<IntegerExpression>();
List<long> coeffs = new List<long>();
exprs.Add(e);
coeffs.Add(1L);
long constant = 0;
while (exprs.Count > 0)
{
IntegerExpression expr = exprs[0];
exprs.RemoveAt(0);
long coeff = coeffs[0];
coeffs.RemoveAt(0);
if (coeff == 0) continue;
if (expr is ProductCst)
{
ProductCst p = (ProductCst)expr;
if (p.Coeff != 0)
{
exprs.Add(p.Expr);
coeffs.Add(p.Coeff * coeff);
}
}
else if (expr is SumArray)
{
SumArray a = (SumArray)expr;
constant += coeff * a.Constant;
foreach (IntegerExpression sub in a.Expressions)
{
exprs.Add(sub);
coeffs.Add(coeff);
}
}
else if (expr is IntVar)
{
int index = expr.Index;
long value = SolutionIntegerValue(index);
constant += coeff * value;
}
else if (expr is NotBooleanVariable)
{
throw new ArgumentException(
"Cannot evaluate a literal in an integer expression.");
}
else
{
throw new ArgumentException("Cannot evaluate '" + expr.ToString() +
"' in an integer expression");
}
}
return constant;
}
public Boolean BooleanValue(ILiteral literal)
{
if (literal is IntVar || literal is NotBooleanVariable)
{
int index = literal.GetIndex();
return SolutionBooleanValue(index);
}
else
{
throw new ArgumentException("Cannot evaluate '" + literal.ToString() +
"' as a boolean literal");
}
}
}
public class CpSolver
namespace Google.OrTools.Sat
{
public CpSolverStatus Solve(CpModel model)
public class CpSolverSolutionCallback : SolutionCallback
{
if (string_parameters_ != null)
public long Value(IntegerExpression e)
{
response_ = SatHelper.SolveWithStringParameters(model.Model,
string_parameters_);
}
else
{
response_ = SatHelper.Solve(model.Model);
}
return response_.Status;
}
List<IntegerExpression> exprs = new List<IntegerExpression>();
List<long> coeffs = new List<long>();
exprs.Add(e);
coeffs.Add(1L);
long constant = 0;
public CpSolverStatus SolveWithSolutionCallback(CpModel model,
SolutionCallback cb)
{
if (string_parameters_ != null)
{
response_ = SatHelper.SolveWithStringParametersAndSolutionCallback(
model.Model, string_parameters_, cb);
}
else
{
response_ = SatHelper.Solve(model.Model);
}
return response_.Status;
}
public CpSolverStatus SearchAllSolutions(CpModel model, SolutionCallback cb)
{
if (string_parameters_ != null)
{
string extra_parameters = " enumerate_all_solutions:true";
response_ =
SatHelper.SolveWithStringParametersAndSolutionCallback(
model.Model, string_parameters_ + extra_parameters, cb);
}
else
{
string parameters = "enumerate_all_solutions:true";
response_ = SatHelper.SolveWithStringParametersAndSolutionCallback(
model.Model, parameters, cb);
}
return response_.Status;
}
public String ResponseStats() {
return SatHelper.SolverResponseStats(response_);
}
public double ObjectiveValue
{
get { return response_.ObjectiveValue; }
}
public double BestObjectiveBound
{
get { return response_.BestObjectiveBound; }
}
public string StringParameters
{
get { return string_parameters_; }
set { string_parameters_ = value; }
}
public CpSolverResponse Response
{
get { return response_; }
}
public long Value(IntegerExpression e)
{
List<IntegerExpression> exprs = new List<IntegerExpression>();
List<long> coeffs = new List<long>();
exprs.Add(e);
coeffs.Add(1L);
long constant = 0;
while (exprs.Count > 0)
{
IntegerExpression expr = exprs[0];
exprs.RemoveAt(0);
long coeff = coeffs[0];
coeffs.RemoveAt(0);
if (coeff == 0) continue;
if (expr is ProductCst)
while (exprs.Count > 0)
{
ProductCst p = (ProductCst)expr;
if (p.Coeff != 0)
IntegerExpression expr = exprs[0];
exprs.RemoveAt(0);
long coeff = coeffs[0];
coeffs.RemoveAt(0);
if (coeff == 0) continue;
if (expr is ProductCst)
{
exprs.Add(p.Expr);
coeffs.Add(p.Coeff * coeff);
ProductCst p = (ProductCst)expr;
if (p.Coeff != 0)
{
exprs.Add(p.Expr);
coeffs.Add(p.Coeff * coeff);
}
}
else if (expr is SumArray)
{
SumArray a = (SumArray)expr;
constant += coeff * a.Constant;
foreach (IntegerExpression sub in a.Expressions)
{
exprs.Add(sub);
coeffs.Add(coeff);
}
}
else if (expr is IntVar)
{
int index = expr.Index;
long value = SolutionIntegerValue(index);
constant += coeff * value;
}
else if (expr is NotBooleanVariable)
{
throw new ArgumentException(
"Cannot evaluate a literal in an integer expression.");
}
else
{
throw new ArgumentException("Cannot evaluate '" + expr.ToString() +
"' in an integer expression");
}
}
else if (expr is SumArray)
return constant;
}
public Boolean BooleanValue(ILiteral literal)
{
if (literal is IntVar || literal is NotBooleanVariable)
{
SumArray a = (SumArray)expr;
constant += coeff * a.Constant;
foreach (IntegerExpression sub in a.Expressions)
{
exprs.Add(sub);
coeffs.Add(coeff);
}
}
else if (expr is IntVar)
{
int index = expr.Index;
long value = index >= 0 ? response_.Solution[index]
: -response_.Solution[-index - 1];
constant += coeff * value;
}
else if (expr is NotBooleanVariable)
{
throw new ArgumentException(
"Cannot evaluate a literal in an integer expression.");
int index = literal.GetIndex();
return SolutionBooleanValue(index);
}
else
{
throw new ArgumentException("Cannot evaluate '" + expr.ToString() +
"' in an integer expression");
throw new ArgumentException("Cannot evaluate '" + literal.ToString() +
"' as a boolean literal");
}
}
return constant;
}
public Boolean BooleanValue(ILiteral literal)
public class CpSolver
{
if (literal is IntVar || literal is NotBooleanVariable)
public CpSolverStatus Solve(CpModel model)
{
int index = literal.GetIndex();
if (index >= 0)
if (string_parameters_ != null)
{
return response_.Solution[index] != 0;
response_ = SatHelper.SolveWithStringParameters(model.Model,
string_parameters_);
}
else
{
return response_.Solution[index] == 0;
response_ = SatHelper.Solve(model.Model);
}
return response_.Status;
}
public CpSolverStatus SolveWithSolutionCallback(CpModel model,
SolutionCallback cb)
{
if (string_parameters_ != null)
{
response_ = SatHelper.SolveWithStringParametersAndSolutionCallback(
model.Model, string_parameters_, cb);
}
else
{
response_ = SatHelper.Solve(model.Model);
}
return response_.Status;
}
public CpSolverStatus SearchAllSolutions(CpModel model, SolutionCallback cb)
{
if (string_parameters_ != null)
{
string extra_parameters = " enumerate_all_solutions:true";
response_ =
SatHelper.SolveWithStringParametersAndSolutionCallback(
model.Model, string_parameters_ + extra_parameters, cb);
}
else
{
string parameters = "enumerate_all_solutions:true";
response_ = SatHelper.SolveWithStringParametersAndSolutionCallback(
model.Model, parameters, cb);
}
return response_.Status;
}
public String ResponseStats()
{
return SatHelper.SolverResponseStats(response_);
}
public double ObjectiveValue
{
get { return response_.ObjectiveValue; }
}
public double BestObjectiveBound
{
get { return response_.BestObjectiveBound; }
}
public string StringParameters
{
get { return string_parameters_; }
set { string_parameters_ = value; }
}
public CpSolverResponse Response
{
get { return response_; }
}
public long Value(IntegerExpression e)
{
List<IntegerExpression> exprs = new List<IntegerExpression>();
List<long> coeffs = new List<long>();
exprs.Add(e);
coeffs.Add(1L);
long constant = 0;
while (exprs.Count > 0)
{
IntegerExpression expr = exprs[0];
exprs.RemoveAt(0);
long coeff = coeffs[0];
coeffs.RemoveAt(0);
if (coeff == 0) continue;
if (expr is ProductCst)
{
ProductCst p = (ProductCst)expr;
if (p.Coeff != 0)
{
exprs.Add(p.Expr);
coeffs.Add(p.Coeff * coeff);
}
}
else if (expr is SumArray)
{
SumArray a = (SumArray)expr;
constant += coeff * a.Constant;
foreach (IntegerExpression sub in a.Expressions)
{
exprs.Add(sub);
coeffs.Add(coeff);
}
}
else if (expr is IntVar)
{
int index = expr.Index;
long value = index >= 0 ? response_.Solution[index]
: -response_.Solution[-index - 1];
constant += coeff * value;
}
else if (expr is NotBooleanVariable)
{
throw new ArgumentException(
"Cannot evaluate a literal in an integer expression.");
}
else
{
throw new ArgumentException("Cannot evaluate '" + expr.ToString() +
"' in an integer expression");
}
}
return constant;
}
public Boolean BooleanValue(ILiteral literal)
{
if (literal is IntVar || literal is NotBooleanVariable)
{
int index = literal.GetIndex();
if (index >= 0)
{
return response_.Solution[index] != 0;
}
else
{
return response_.Solution[index] == 0;
}
}
else
{
throw new ArgumentException("Cannot evaluate '" + literal.ToString() +
"' as a boolean literal");
}
}
else
public long NumBranches()
{
throw new ArgumentException("Cannot evaluate '" + literal.ToString() +
"' as a boolean literal");
return response_.NumBranches;
}
public long NumConflicts()
{
return response_.NumConflicts;
}
public double WallTime()
{
return response_.WallTime;
}
private CpModelProto model_;
private CpSolverResponse response_;
string string_parameters_;
}
public long NumBranches()
{
return response_.NumBranches;
}
public long NumConflicts()
{
return response_.NumConflicts;
}
public double WallTime()
{
return response_.WallTime;
}
private CpModelProto model_;
private CpSolverResponse response_;
string string_parameters_;
}
} // namespace Google.OrTools.Sat

7
ortools/sat/doc/boolean_logic.md
View File

@@ -229,11 +229,12 @@ public class CodeSamplesSat
{
CpModel model = new CpModel();
IntVar x = model.NewBoolVar("x");
IntVar y = model.newBoolVar("y");
model.AddBoolOr(new ILiteral[] {x, y.Not()});
IntVar y = model.NewBoolVar("y");
model.AddBoolOr(new ILiteral[] { x, y.Not() });
}
static void Main() {
static void Main()
{
BoolOrSample();
}
}

6
ortools/sat/doc/channeling.md
View File

@@ -672,7 +672,7 @@ public class CodeSamplesSat
int slack_capacity = 20;
int num_bins = 10;
int[,] items = new int[,] { {20, 12}, {15, 12}, {30, 8}, {45, 5} };
int[,] items = new int[,] { { 20, 12 }, { 15, 12 }, { 30, 8 }, { 45, 5 } };
int num_items = items.GetLength(0);
// Model.
@@ -705,7 +705,8 @@ public class CodeSamplesSat
// Links load and x.
int[] sizes = new int[num_items];
for (int i = 0; i < num_items; ++i) {
for (int i = 0; i < num_items; ++i)
{
sizes[i] = items[i, 0];
}
for (int b = 0; b < num_bins; ++b)
@@ -766,6 +767,7 @@ public class CodeSamplesSat
Console.WriteLine(String.Format(" - branches : {0}",
solver.NumBranches()));
Console.WriteLine(String.Format(" - wall time : {0} s",
solver.WallTime()));
}
static void Main()

65
ortools/sat/doc/solver.md
View File

@@ -351,7 +351,7 @@ public class CodeSamplesSat
CpSolver solver = new CpSolver();
// Adds a time limit. Parameters are stored as strings in the solver.
solver.StringParameters = "max_time_in_seconds:10.0" ;
solver.StringParameters = "max_time_in_seconds:10.0";
CpSolverStatus status = solver.Solve(model);
@@ -592,18 +592,16 @@ public class VarArraySolutionPrinterWithObjective : CpSolverSolutionCallback
public override void OnSolutionCallback()
{
Console.WriteLine(String.Format("Solution #{0}: time = {1:F2} s",
solution_count_, WallTime()));
Console.WriteLine(
String.Format(" objective value = {0}", ObjectiveValue()));
foreach (IntVar v in variables_)
{
Console.WriteLine(String.Format("Solution #{0}: time = {1:F2} s",
solution_count_, WallTime()));
Console.WriteLine(
String.Format(" objective value = {0}", ObjectiveValue()));
foreach (IntVar v in variables_)
{
Console.WriteLine(
String.Format(" {0} = {1}", v.ShortString(), Value(v)));
}
solution_count_++;
String.Format(" {0} = {1}", v.ShortString(), Value(v)));
}
solution_count_++;
}
public int SolutionCount()
@@ -624,9 +622,9 @@ public class CodeSamplesSat
// Creates the variables.
int num_vals = 3;
IntVar x = model.NewIntVar(0, num_vals - 1, 'x');
IntVar y = model.NewIntVar(0, num_vals - 1, 'y');
IntVar z = model.NewIntVar(0, num_vals - 1, 'z');
IntVar x = model.NewIntVar(0, num_vals - 1, "x");
IntVar y = model.NewIntVar(0, num_vals - 1, "y");
IntVar z = model.NewIntVar(0, num_vals - 1, "z");
// Adds a different constraint.
model.Add(x != y);
@@ -637,10 +635,10 @@ public class CodeSamplesSat
// Creates a solver and solves the model.
CpSolver solver = new CpSolver();
VarArraySolutionPrinterWithObjective cb =
new VarArraySolutionPrinterWithObjective(new IntVar[] {x, y, z});
new VarArraySolutionPrinterWithObjective(new IntVar[] { x, y, z });
solver.SolveWithSolutionCallback(model, cb);
Console.WriteLine(String.Format('Number of solutions found: {0}',
cb.SolutionCount()));
Console.WriteLine(String.Format("Number of solutions found: {0}",
cb.SolutionCount()));
}
static void Main()
@@ -689,7 +687,7 @@ class VarArraySolutionPrinter(cp_model.CpSolverSolutionCallback):
return self.__solution_count
def MinimalSatSearchForAllSolutions():
def SolveAllSolutions():
"""Showcases calling the solver to search for all solutions."""
# Creates the model.
model = cp_model.CpModel()
@@ -709,7 +707,7 @@ def MinimalSatSearchForAllSolutions():
print('Number of solutions found: %i' % solution_printer.SolutionCount())
MinimalSatSearchForAllSolutions()
SolveAllSolutions()
```
### C++ code
@@ -901,7 +899,7 @@ public class CodeSamplesSat
// Creates a solver and solves the model.
CpSolver solver = new CpSolver();
VarArraySolutionPrinter cb =
new VarArraySolutionPrinter(new IntVar[] {x, y, z});
new VarArraySolutionPrinter(new IntVar[] { x, y, z });
solver.SearchAllSolutions(model, cb);
Console.WriteLine(String.Format("Number of solutions found: {0}",
cb.SolutionCount()));
@@ -1130,22 +1128,27 @@ CpSolverSolutionCallback.OnSolutionCallback().
using System;
using Google.OrTools.Sat;
public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback {
public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback
{
public VarArraySolutionPrinterWithLimit(IntVar[] variables,
int solution_limit) {
int solution_limit)
{
variables_ = variables;
solution_limit_ = solution_limit;
}
public override void OnSolutionCallback() {
public override void OnSolutionCallback()
{
Console.WriteLine(String.Format("Solution #{0}: time = {1:F2} s",
solution_count_, WallTime()));
foreach (IntVar v in variables_) {
foreach (IntVar v in variables_)
{
Console.WriteLine(
String.Format(" {0} = {1}", v.ShortString(), Value(v)));
}
solution_count_++;
if (solution_count_ >= solution_limit_) {
if (solution_count_ >= solution_limit_)
{
Console.WriteLine(
String.Format("Stopping search after {0} solutions",
solution_limit_));
@@ -1153,7 +1156,8 @@ public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback {
}
}
public int SolutionCount() {
public int SolutionCount()
{
return solution_count_;
}
@@ -1162,8 +1166,10 @@ public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback {
private int solution_limit_;
}
public class CodeSamplesSat {
static void StopAfterNSolutions() {
public class CodeSamplesSat
{
static void StopAfterNSolutions()
{
// Creates the model.
CpModel model = new CpModel();
// Creates the variables.
@@ -1176,13 +1182,14 @@ public class CodeSamplesSat {
// Creates a solver and solves the model.
CpSolver solver = new CpSolver();
VarArraySolutionPrinterWithLimit cb =
new VarArraySolutionPrinterWithLimit(new IntVar[] {x, y, z}, 5);
new VarArraySolutionPrinterWithLimit(new IntVar[] { x, y, z }, 5);
solver.SearchAllSolutions(model, cb);
Console.WriteLine(String.Format("Number of solutions found: {0}",
cb.SolutionCount()));
}
static void Main() {
static void Main()
{
StopAfterNSolutions();
}
}

59
ortools/sat/samples/binpacking_problem.cs
View File

@@ -14,14 +14,16 @@
using System;
using Google.OrTools.Sat;
public class CodeSamplesSat {
static void BinpackingProblem() {
public class CodeSamplesSat
{
static void BinpackingProblem()
{
// Data.
int bin_capacity = 100;
int slack_capacity = 20;
int num_bins = 10;
int[,] items = new int[,] { {20, 12}, {15, 12}, {30, 8}, {45, 5} };
int[,] items = new int[,] { { 20, 12 }, { 15, 12 }, { 30, 8 }, { 45, 5 } };
int num_items = items.GetLength(0);
// Model.
@@ -29,42 +31,51 @@ public class CodeSamplesSat {
// Main variables.
IntVar[,] x = new IntVar[num_items, num_bins];
for (int i = 0; i < num_items; ++i) {
for (int i = 0; i < num_items; ++i)
{
int num_copies = items[i, 1];
for (int b = 0; b < num_bins; ++b) {
for (int b = 0; b < num_bins; ++b)
{
x[i, b] = model.NewIntVar(0, num_copies, String.Format("x_{0}_{1}", i, b));
}
}
// Load variables.
IntVar[] load = new IntVar[num_bins];
for (int b = 0; b < num_bins; ++b) {
for (int b = 0; b < num_bins; ++b)
{
load[b] = model.NewIntVar(0, bin_capacity, String.Format("load_{0}", b));
}
// Slack variables.
IntVar[] slacks = new IntVar[num_bins];
for (int b = 0; b < num_bins; ++b) {
for (int b = 0; b < num_bins; ++b)
{
slacks[b] = model.NewBoolVar(String.Format("slack_{0}", b));
}
// Links load and x.
int[] sizes = new int[num_items];
for (int i = 0; i < num_items; ++i) {
for (int i = 0; i < num_items; ++i)
{
sizes[i] = items[i, 0];
}
for (int b = 0; b < num_bins; ++b) {
for (int b = 0; b < num_bins; ++b)
{
IntVar[] tmp = new IntVar[num_items];
for (int i = 0; i < num_items; ++i) {
for (int i = 0; i < num_items; ++i)
{
tmp[i] = x[i, b];
}
model.Add(load[b] == tmp.ScalProd(sizes));
}
// Place all items.
for (int i = 0; i < num_items; ++i) {
for (int i = 0; i < num_items; ++i)
{
IntVar[] tmp = new IntVar[num_bins];
for (int b = 0; b < num_bins; ++b) {
for (int b = 0; b < num_bins; ++b)
{
tmp[b] = x[i, b];
}
model.Add(tmp.Sum() == items[i, 1]);
@@ -72,7 +83,8 @@ public class CodeSamplesSat {
// Links load and slack.
int safe_capacity = bin_capacity - slack_capacity;
for (int b = 0; b < num_bins; ++b) {
for (int b = 0; b < num_bins; ++b)
{
// slack[b] => load[b] <= safe_capacity.
model.Add(load[b] <= safe_capacity).OnlyEnforceIf(slacks[b]);
// not(slack[b]) => load[b] > safe_capacity.
@@ -88,26 +100,29 @@ public class CodeSamplesSat {
Console.WriteLine(String.Format("Solve status: {0}", status));
if (status == CpSolverStatus.Optimal) {
Console.WriteLine(String.Format("Optimal objective value: {0}",
solver.ObjectiveValue));
for (int b = 0; b < num_bins; ++b) {
solver.ObjectiveValue));
for (int b = 0; b < num_bins; ++b)
{
Console.WriteLine(String.Format("load_{0} = {1}",
b, solver.Value(load[b])));
for (int i = 0; i < num_items; ++i) {
b, solver.Value(load[b])));
for (int i = 0; i < num_items; ++i)
{
Console.WriteLine(string.Format(" item_{0}_{1} = {2}",
i, b, solver.Value(x[i, b])));
i, b, solver.Value(x[i, b])));
}
}
}
Console.WriteLine("Statistics");
Console.WriteLine(String.Format(" - conflicts : {0}",
solver.NumConflicts()));
solver.NumConflicts()));
Console.WriteLine(String.Format(" - branches : {0}",
solver.NumBranches()));
solver.NumBranches()));
Console.WriteLine(String.Format(" - wall time : {0} s",
solver.WallTime()));
solver.WallTime()));
}
static void Main() {
static void Main()
{
BinpackingProblem();
}
}

11
ortools/sat/samples/bool_or_sample.cs
View File

@@ -14,15 +14,18 @@
using System;
using Google.OrTools.Sat;
public class CodeSamplesSat {
static void BoolOrSample() {
public class CodeSamplesSat
{
static void BoolOrSample()
{
CpModel model = new CpModel();
IntVar x = model.NewBoolVar("x");
IntVar y = model.NewBoolVar("y");
model.AddBoolOr(new ILiteral[] {x, y.Not()});
model.AddBoolOr(new ILiteral[] { x, y.Not() });
}
static void Main() {
static void Main()
{
BoolOrSample();
}
}

2
ortools/sat/samples/solve_all_solutions.cs
View File

@@ -64,7 +64,7 @@ public class CodeSamplesSat
// Creates a solver and solves the model.
CpSolver solver = new CpSolver();
VarArraySolutionPrinter cb =
new VarArraySolutionPrinter(new IntVar[] {x, y, z});
new VarArraySolutionPrinter(new IntVar[] { x, y, z });
solver.SearchAllSolutions(model, cb);
Console.WriteLine(String.Format("Number of solutions found: {0}",
cb.SolutionCount()));

26
ortools/sat/samples/solve_with_intermediate_solutions.cs
View File

@@ -14,24 +14,29 @@
using System;
using Google.OrTools.Sat;
public class VarArraySolutionPrinterWithObjective : CpSolverSolutionCallback {
public VarArraySolutionPrinterWithObjective(IntVar[] variables) {
public class VarArraySolutionPrinterWithObjective : CpSolverSolutionCallback
{
public VarArraySolutionPrinterWithObjective(IntVar[] variables)
{
variables_ = variables;
}
public override void OnSolutionCallback() {
public override void OnSolutionCallback()
{
Console.WriteLine(String.Format("Solution #{0}: time = {1:F2} s",
solution_count_, WallTime()));
Console.WriteLine(
String.Format(" objective value = {0}", ObjectiveValue()));
foreach (IntVar v in variables_) {
foreach (IntVar v in variables_)
{
Console.WriteLine(
String.Format(" {0} = {1}", v.ShortString(), Value(v)));
}
solution_count_++;
}
public int SolutionCount() {
public int SolutionCount()
{
return solution_count_;
}
@@ -39,8 +44,10 @@ public class VarArraySolutionPrinterWithObjective : CpSolverSolutionCallback {
private IntVar[] variables_;
}
public class CodeSamplesSat {
static void MinimalCpSatPrintIntermediateSolutions() {
public class CodeSamplesSat
{
static void MinimalCpSatPrintIntermediateSolutions()
{
// Creates the model.
CpModel model = new CpModel();
// Creates the variables.
@@ -59,13 +66,14 @@ public class CodeSamplesSat {
// Creates a solver and solves the model.
CpSolver solver = new CpSolver();
VarArraySolutionPrinterWithObjective cb =
new VarArraySolutionPrinterWithObjective(new IntVar[] {x, y, z});
new VarArraySolutionPrinterWithObjective(new IntVar[] { x, y, z });
solver.SolveWithSolutionCallback(model, cb);
Console.WriteLine(String.Format("Number of solutions found: {0}",
cb.SolutionCount()));
}
static void Main() {
static void Main()
{
MinimalCpSatPrintIntermediateSolutions();
}
}

2
ortools/sat/samples/solve_with_time_limit.cs
View File

@@ -33,7 +33,7 @@ public class CodeSamplesSat
CpSolver solver = new CpSolver();
// Adds a time limit. Parameters are stored as strings in the solver.
solver.StringParameters = "max_time_in_seconds:10.0" ;
solver.StringParameters = "max_time_in_seconds:10.0";
CpSolverStatus status = solver.Solve(model);

29
ortools/sat/samples/stop_after_n_solutions.cs
View File

@@ -15,22 +15,27 @@
using System;
using Google.OrTools.Sat;
public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback {
public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback
{
public VarArraySolutionPrinterWithLimit(IntVar[] variables,
int solution_limit) {
int solution_limit)
{
variables_ = variables;
solution_limit_ = solution_limit;
}
public override void OnSolutionCallback() {
public override void OnSolutionCallback()
{
Console.WriteLine(String.Format("Solution #{0}: time = {1:F2} s",
solution_count_, WallTime()));
foreach (IntVar v in variables_) {
foreach (IntVar v in variables_)
{
Console.WriteLine(
String.Format(" {0} = {1}", v.ShortString(), Value(v)));
}
solution_count_++;
if (solution_count_ >= solution_limit_) {
if (solution_count_ >= solution_limit_)
{
Console.WriteLine(
String.Format("Stopping search after {0} solutions",
solution_limit_));
@@ -38,7 +43,8 @@ public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback {
}
}
public int SolutionCount() {
public int SolutionCount()
{
return solution_count_;
}
@@ -47,8 +53,10 @@ public class VarArraySolutionPrinterWithLimit : CpSolverSolutionCallback {
private int solution_limit_;
}
public class CodeSamplesSat {
static void StopAfterNSolutions() {
public class CodeSamplesSat
{
static void StopAfterNSolutions()
{
// Creates the model.
CpModel model = new CpModel();
// Creates the variables.
@@ -61,13 +69,14 @@ public class CodeSamplesSat {
// Creates a solver and solves the model.
CpSolver solver = new CpSolver();
VarArraySolutionPrinterWithLimit cb =
new VarArraySolutionPrinterWithLimit(new IntVar[] {x, y, z}, 5);
new VarArraySolutionPrinterWithLimit(new IntVar[] { x, y, z }, 5);
solver.SearchAllSolutions(model, cb);
Console.WriteLine(String.Format("Number of solutions found: {0}",
cb.SolutionCount()));
}
static void Main() {
static void Main()
{
StopAfterNSolutions();
}
}