internal override MaxTimeSolution Solve(MaxTimeProblem problem)
{
MaxTimeCalculator calculator = new MaxTimeCalculator(
problem);
// generate a ATSP solution.
IRoute tsp_solution = _tsp_solution;
if (tsp_solution == null)
{
tsp_solution = _tsp_solver.Solve(new TSPProblem(problem));
}
// generate subtours from this solution.
MaxTimeSolution solution = new MaxTimeSolution(problem.Size, true);
// select a random start point.
int start = OsmSharp.Math.Random.StaticRandomGenerator.Get().Generate(problem.Size);
// start the first tour.
int placed = 0;
int previous = -1;
// place the first customer.
double weight = 0;
double total_weight = 0;
IRoute route = solution.Add(start);
previous = start;
while (placed < problem.Size)
{
// get the next customer from the tsp solution.
int next = tsp_solution.GetNeigbours(previous)[0];
// get the weight to the current start.
double weight_to_next = problem.WeightMatrix[previous][next];
double weight_to_start = problem.WeightMatrix[next][start];
total_weight = calculator.CalculateOneRouteIncrease(
weight, weight_to_next + weight_to_start);
weight = calculator.CalculateOneRouteIncrease(
weight, weight_to_next);
if (total_weight > problem.Max.Value)
{ // start a new route.
route = solution.Add(next);
weight = 0;
}
else
{ // just insert the next customer.
route.InsertAfter(previous, next);
//route.InsertAfterAndRemove(previous, next, -1);
}
// set the previous.
previous = next;
placed++;
}
if (!solution.IsValid())
{
throw new Exception();
}
StringBuilder builder = new StringBuilder();
builder.Append("[");
total_weight = 0;
for (int idx = 0; idx < solution.Count; idx++)
{
//IRoute route = routes.Route(idx);
route = solution.Route(idx);
weight = calculator.CalculateOneRoute(route);
builder.Append(" ");
builder.Append(weight);
builder.Append(" ");
total_weight = total_weight + weight;
}
builder.Append("]");
builder.Append(total_weight);
builder.Append(": ");
builder.Append(calculator.Calculate(solution));
Console.WriteLine(builder.ToString());
return(solution);
}
private void FillRoutes(MaxTimeCalculator calculator, MaxTimeSolution route1, MaxTimeSolution solution,
MaxTimeProblem problem)
{
double[] weights = new double[solution.Count];
// insert all non-placed customers in the order of the first route.
HashSet <int> unplaced = new HashSet <int>();
for (int route_idx = 0; route_idx < route1.Count; route_idx++)
{
IRoute route1_route = route1.Route(route_idx);
foreach (int customer in route1_route)
{
if (!solution.Contains(customer))
{
unplaced.Add(customer);
}
}
}
for (int idx = 0; idx < solution.Count; idx++)
{
IRoute route = solution.Route(idx);
weights[idx] = calculator.CalculateOneRoute(route);
}
// insert all non-placed customers in the order of the first route.
//for (int route_idx = 0; route_idx < route1.Count; route_idx++)
//{
// IRoute route1_route = route1.Route(route_idx);
// foreach (int customer in route1_route)
// {
// if (!solution.Contains(customer))
// {
while (unplaced.Count > 0)
{
int customer = unplaced.First <int>();
// try reinsertion.
CheapestInsertionResult result = new CheapestInsertionResult();
result.Increase = double.MaxValue;
int target_idx = -1;
CheapestInsertionResult unlimited_result = new CheapestInsertionResult();
unlimited_result.Increase = double.MaxValue;
int unlimited_target_idx = -1;
for (int idx = 0; idx < solution.Count; idx++)
{
IRoute route = solution.Route(idx);
CheapestInsertionResult current_result =
CheapestInsertionHelper.CalculateBestPlacement(problem.Weights, route, customer);
if (current_result.Increase < result.Increase)
{
if (weights[idx] + current_result.Increase < problem.Max.Value)
{
target_idx = idx;
result = current_result;
if (result.Increase <= 0)
{
break;
}
}
}
if (current_result.Increase < unlimited_result.Increase)
{
unlimited_target_idx = idx;
unlimited_result = current_result;
}
}
if (target_idx < 0)
{
result = unlimited_result;
target_idx = unlimited_target_idx;
}
// get the target route and insert.
IRoute target_route = solution.Route(target_idx);
weights[target_idx] = weights[target_idx] + result.Increase;
//target_route.InsertAfterAndRemove(result.CustomerBefore, result.Customer, result.CustomerAfter);
target_route.InsertAfter(result.CustomerBefore, result.Customer);
unplaced.Remove(result.Customer);
////solution.ToString();
//if (!solution.IsValid())
//{
// throw new Exception();
//}
}
// }
//}
}
internal override MaxTimeSolution Solve(MaxTimeProblem problem)
{
MaxTimeCalculator calculator = new MaxTimeCalculator(
problem);
// generate a ATSP solution.
IRoute tsp_solution = _tsp_solution;
if (tsp_solution == null)
{
tsp_solution = _tsp_solver.Solve(new TSPProblem(problem));
}
// generate subtours from this solution.
MaxTimeSolution solution = new MaxTimeSolution(problem.Size, true);
// select a random start point.
int start = OsmSharp.Math.Random.StaticRandomGenerator.Get().Generate(problem.Size);
// start the first tour.
int placed = 0;
int previous = -1;
// place the first customer.
double weight = 0;
double total_weight = 0;
IRoute route = solution.Add(start);
previous = start;
while (placed < problem.Size)
{
// get the next customer from the tsp solution.
int next = tsp_solution.GetNeigbours(previous)[0];
// get the weight to the current start.
double weight_to_next = problem.WeightMatrix[previous][next];
double weight_to_start = problem.WeightMatrix[next][start];
total_weight = calculator.CalculateOneRouteIncrease(
weight, weight_to_next + weight_to_start);
weight = calculator.CalculateOneRouteIncrease(
weight, weight_to_next);
if (total_weight > problem.Max.Value)
{ // start a new route.
route = solution.Add(next);
weight = 0;
}
else
{ // just insert the next customer.
route.InsertAfter(previous, next);
//route.InsertAfterAndRemove(previous, next, -1);
}
// set the previous.
previous = next;
placed++;
}
if (!solution.IsValid())
{
throw new Exception();
}
StringBuilder builder = new StringBuilder();
builder.Append("[");
total_weight = 0;
for (int idx = 0; idx < solution.Count; idx++)
{
//IRoute route = routes.Route(idx);
route = solution.Route(idx);
weight = calculator.CalculateOneRoute(route);
builder.Append(" ");
builder.Append(weight);
builder.Append(" ");
total_weight = total_weight + weight;
}
builder.Append("]");
builder.Append(total_weight);
builder.Append(": ");
builder.Append(calculator.Calculate(solution));
OsmSharp.Logging.Log.TraceEvent("TSPPlacementSolver", TraceEventType.Information, builder.ToString());
return solution;
}
