public Mypermutation(Mypermutation item)
{
int[] newperm = new int[item.permutationLength];
Array.Copy(item.permutation, 0, newperm, 0, item.permutationLength);
this.permutation = newperm;
this.permutationLength = item.permutationLength;
CalculateUtility();
rnd = new Random();
}
private static Mypermutation[] FindBestPermutation(Mypermutation input)
{
// Debug.WriteLine($"Input = {input.ToString()}");
int bestutility = 0;
List <Mypermutation> bestList = new List <Mypermutation>();
List <Mypermutation> toRemove = new List <Mypermutation>();
for (int i = 0; i < input.permutationLength; i++)
{
int moveUp = input.permutation[i];
int moveDown = input.permutationLength - input.permutation[i] - 1;
for (int j = 1; j <= moveUp; j++)
{
input.permutation[i] = input.permutation[i] - j;
input.CalculateUtility();
// Debug.WriteLine($"Column nr {i} muve u nr {j} = {input.ToString()} Utility: {input.utility}");
if (input.utility >= bestutility)
{
bestutility = input.utility;
Mypermutation better = new Mypermutation(input);
bestList.Add(better);
}
input.permutation[i] = input.permutation[i] + j;
}
for (int k = 1; k <= moveDown; k++)
{
input.permutation[i] = input.permutation[i] + k;
input.CalculateUtility();
// Debug.WriteLine($"Column nr {i} muve d nr {k} = {input.ToString()} Utility: {input.utility}");
if (input.utility >= bestutility)
{
bestutility = input.utility;
Mypermutation better = new Mypermutation(input);
bestList.Add(better);
}
input.permutation[i] = input.permutation[i] - k;
}
}
foreach (Mypermutation item in bestList)
{
if (item.utility < bestutility)
{
toRemove.Add(item);
}
}
foreach (Mypermutation item in toRemove)
{
bestList.Remove(item);
}
// Debug.WriteLine($"Num of tables {bestList.Count} Utility: {bestutility}");
return(bestList.ToArray());
}
private static void Main(string[] args)
{
int permutationLength = 8;
// Console.Write("Select number of gueens to proceed Genetic algorithm solution : ");
// permutationLength = Convert.ToInt32(Console.ReadLine());
// Console.WriteLine();
Mypermutation startPermutation = new Mypermutation(permutationLength);
Console.WriteLine($"Starting permutation is {startPermutation.ToString()} with utility {startPermutation.utility}");
Mypermutation[] listOfBest;
int bestUtility = 0;
int numofboards = 1;
bool found = false;
int numberOfTries = 5;
int bestPosibleUtility = startPermutation.bestutility;
Random rnd = new Random();
var watch = Stopwatch.StartNew();
listOfBest = FindBestPermutation(startPermutation);
if (bestUtility == bestPosibleUtility)
{
Console.WriteLine($"Found Soution {listOfBest[0].ToString()} Searched in {numofboards} tables");
found = true;
}
numberOfTries--;
bestUtility = listOfBest[0].utility;
while (bestUtility < bestPosibleUtility && numberOfTries >= 0)
{
bestUtility = listOfBest[0].utility;
int choice = rnd.Next(0, listOfBest.Length);
if (bestUtility == bestPosibleUtility)
{
Console.WriteLine($"Found Soution {listOfBest[0].ToString()} Searched in {numofboards} tables");
found = true;
break;
}
listOfBest = FindBestPermutation(listOfBest[choice]);
numofboards++;
numberOfTries--;
}
watch.Stop();
float elapsedMs = watch.ElapsedMilliseconds;
if (found)
{
Console.WriteLine($"Found solution in {elapsedMs} ms.");
Console.Write($"Solution is: {listOfBest[0].ToString()}");
Console.WriteLine("\n");
Console.WriteLine($"Drawing chessboard...");
DrawChessBoard(listOfBest[0].permutation);
}
else
{
Console.WriteLine($"Didn't found solution, local minimum, or excided number of tries Utility to get {bestPosibleUtility}");
Console.WriteLine($"Best found permutation {listOfBest[0].ToString()} with utility of {listOfBest[0].utility}");
}
Console.ReadKey();
}