public static NQueen[] nextBoard(NQueen[] presentBoard, int n)
{
NQueen[] nextBoard = new NQueen[n];
NQueen[] tmpBoard = new NQueen[n];
int presentHeuristic = findHeuristic(presentBoard);
int bestHeuristic = presentHeuristic;
int tempH;
for (int i = 0; i < n; i++)
{
// Copy present board as best board and temp board
nextBoard[i] = new NQueen(presentBoard[i].GetRow(), presentBoard[i].GetColumn());
tmpBoard[i] = nextBoard[i];
}
// Check each column
for (int i = 0; i < n; i++)
{
if (i > 0)
{
tmpBoard[i - 1] = new NQueen(presentBoard[i - 1].GetRow(), presentBoard[i - 1].GetColumn());
}
tmpBoard[i] = new NQueen(0, tmpBoard[i].GetColumn());
// Check each row
for (int j = 0; j < n; j++)
{
//Find the heuristic
tempH = findHeuristic(tmpBoard);
//Check which board is better
//if tempboard is better
if (tempH < bestHeuristic)
{
// Copy the temp board as best board
bestHeuristic = tempH;
for (int k = 0; k < n; k++)
{
nextBoard[k] = new NQueen(tmpBoard[k].GetRow(), tmpBoard[k].GetColumn());
}
}
//Move the queen
if (tmpBoard[i].GetRow() != n - 1)
{
tmpBoard[i].MoveRow();
}
}
}
//Check whether the present bord and the best board found have same heuristic
if (bestHeuristic == presentHeuristic)
{
//if they do, make a random new board to avoid maxima
nextBoard = CreateBoard(n);
heuristic = findHeuristic(nextBoard);
}
else
{
heuristic = bestHeuristic;
}
return(nextBoard);
}
public static NQueen[] CreateBoard(int n)
{
NQueen[] Board = new NQueen[n];
for (int i = 0; i < n; i++)
{
Board[i] = new NQueen(r.Next(n), i);
}
return(Board);
}
public bool BoardCheck(NQueen Board)
{
if (Row == Board.GetRow() || Column == Board.GetColumn())
{
return(true);
}
// Check diagonals
else if (Math.Abs(Column - Board.GetColumn()) == Math.Abs(Row - Board.GetRow()))
{
return(true);
}
return(false);
}
