using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] board=new int[10,10];
            n_queens(board, 4, 2);
        }
        public static void n_queens(int[,] board, int size, int solution_num)
        {
            int temp;
            int[] malkot = new int[size];
            for (int k = 0; k < size; k++)
            {
                malkot[k] = -1;
            }
            for (int i = 0; i < size; i++)
            {
                temp = PutMeMalkot(malkot, size, 0, 0, i);
                if (temp != -4)
                {
                    malkot[i] = temp;
                }
                else
                {
                    temp = ChnageAllThePastMalkot(malkot, i, size, i);
                    if (temp == -6)
                    {
                        Console.WriteLine("אין פיתרון");
                    }
                    else
                    {
                        i = temp;
                    }
                }
            }
            Console.WriteLine("asdasd");
        }
        public static int ChnageAllThePastMalkot(int[] malkot, int Row,int size,int witchRow)
        {
            if (malkot[Row]+1 < size-1)
            {
                if (malkot[Row - 1] + 1 > size)
                {
                    malkot[Row - 1] = -1;
                    return ChnageAllThePastMalkot(malkot, Row - 1, size, witchRow);
                }
                else
                {
                    int temp = PutMeMalkot(malkot, size, 0, malkot[Row - 1] + 1, Row - 1);
                    if (temp == -4)
                    {
                        malkot[Row - 1] = -1;
                        return ChnageAllThePastMalkot(malkot, Row - 1, size, witchRow);
                    }
                    else
                    {
                        malkot[Row - 1] = temp;
                        return Row - 1;
                    }
                }
            }
            else
            {
                malkot[witchRow] = -6;
                return -6;
            }
        }
        public static int PutMeMalkot(int[] malkot, int size,int row,int place,int WhatRow)
        {
            if (place > size-1)
            {
                return -4;
            }
            if (row < size-1 && WhatRow != 0 && row != WhatRow)
            {
                if (malkot[row] != place
                    && (malkot[row] + (1 * (WhatRow - row)) != place)
                    && (malkot[row] - (1 * (WhatRow - row)) != place))
                {
                    return PutMeMalkot(malkot, size, row + 1, place, WhatRow);
                }
                else
                {
                    return PutMeMalkot(malkot, size, 0, place + 1, WhatRow);
                }
            }
            else
            {
                return place;
            }
            return -2;
        }
    }
}