uqac-ia-sudoku-csp/uqac-ia-sudoku-csp/Solver/NextValueChoosers/BasicValueChooser.cs

using System.Collections.Generic;
using uqac_ia_sudoku_csp.Interfaces;

namespace uqac_ia_sudoku_csp.Solver.NextValueChoosers
{
    public class BasicValueChooser : INextValueChooser
    {
        public void SelectVariable(Board board, out int x, out int y, IList<IConstraint> constraints)
        {
            for (var xx = 0; xx < board.Size; ++xx)
            {
                for (var yy = 0; yy < board.Size; ++yy)
                {
                    if (board.GetNumber(xx, yy) == null)
                    {
                        x = xx;
                        y = yy;
                        return;
                    }
                }
            }
            x = -1;
            y = -1;
        }
    }
}