leetcode36

public class Solution
    {
        public bool IsValidSudoku(char[,] board)
        {
            for (int i = ; i < ; i++)
            {
                var dic = new Dictionary<char, int>();
                for (int j = ; j < ; j++)
                {
                    var num = board[i, j];
                    if (num == '.')
                    {
                        continue;
                    }
                    if (dic.ContainsKey(num))
                    {
                        return false;
                    }
                    else
                    {
                        dic.Add(num, );
                    }
                }
                dic.Clear();
            }

            for (int j = ; j < ; j++)
            {
                var dic = new Dictionary<char, int>();
                for (int i = ; i < ; i++)
                {
                    var num = board[i, j];
                    if (num == '.')
                    {
                        continue;
                    }
                    if (dic.ContainsKey(num))
                    {
                        return false;
                    }
                    else
                    {
                        dic.Add(num, );
                    }
                }
                dic.Clear();
            }

            for (int a = ; a < ; a++)
            {
                for (int b = ; b < ; b++)
                {
                    var dic = new Dictionary<char, int>();
                    for (int i =  * a; i <  * (a + ); i++)
                    {
                        for (int j =  * b; j <  * (b + ); j++)
                        {
                            //Console.Write(i + "," + j + " ");
                            var num = board[i, j];
                            if (num == '.')
                            {
                                continue;
                            }
                            if (dic.ContainsKey(num))
                            {
                                return false;
                            }
                            else
                            {
                                dic.Add(num, );
                            }
                        }
                    }
                    dic.Clear();
                    //Console.WriteLine();
                }
            }
            return true;
        }
    }