static void Main()
{
// [START solver]
LinearSumAssignment assignment = new LinearSumAssignment();
// [END solver]
// [START data]
int[,] costs =
{
{ 90, 76, 75, 70 },
{ 35, 85, 55, 65 },
{ 125, 95, 90, 105 },
{ 45, 110, 95, 115 },
};
int numWorkers = 4;
int[] allWorkers = Enumerable.Range(0, numWorkers).ToArray();
int numTasks = 4;
int[] allTasks = Enumerable.Range(0, numTasks).ToArray();
// [END data]
// [START constraints]
// Add each arc.
foreach (int w in allWorkers)
{
foreach (int t in allTasks)
{
if (costs[w, t] != 0)
{
assignment.AddArcWithCost(w, t, costs[w, t]);
}
}
}
// [END constraints]
// [START solve]
LinearSumAssignment.Status status = assignment.Solve();
// [END solve]
// [START print_solution]
if (status == LinearSumAssignment.Status.OPTIMAL)
{
Console.WriteLine($"Total cost: {assignment.OptimalCost()}.");
foreach (int worker in allWorkers)
{
Console.WriteLine($"Worker {worker} assigned to task {assignment.RightMate(worker)}. " +
$"Cost: {assignment.AssignmentCost(worker)}.");
}
}
else
{
Console.WriteLine("Solving the linear assignment problem failed.");
Console.WriteLine($"Solver status: {status}.");
}
// [END print_solution]
}
private static void Run(int[][] costs)
{
var botsCount = costs.Length;
var tasksCount = costs[0].Length;
Console.WriteLine($"*** Start with Bots = {botsCount} , tasks = {tasksCount} ***");
// Solver usage
var assignment = new LinearSumAssignment();
for (var bot = 0; bot < botsCount; bot++)
{
for (var task = 0; task < tasksCount; task++)
{
assignment.AddArcWithCost(bot, task, costs[bot][task]);
}
}
var solveStatus = assignment.Solve();
// Check the result
if (solveStatus == LinearSumAssignment.Status.OPTIMAL)
{
Console.WriteLine($" Optimal Cost = {assignment.OptimalCost()}");
for (int i = 0; i < assignment.NumNodes(); i++)
{
Console.WriteLine($"Task {assignment.RightMate(i)} assigned to Bot {i}, distance {assignment.AssignmentCost(i)}");
}
}
else if (solveStatus == LinearSumAssignment.Status.INFEASIBLE)
{
Console.WriteLine("No assignment is possible.");
}
else if (solveStatus == LinearSumAssignment.Status.POSSIBLE_OVERFLOW)
{
Console.WriteLine("Some input costs are too large and may cause an integer overflow.");
}
}
