<reponame>YangXiaoo/NoteBook
'''

Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:

Each row must contain the digits 1-9 without repetition.
Each column must contain the digits 1-9 without repetition.
Each of the 9 3x3 sub-boxes of the grid must contain the digits 1-9 without repetition.

A partially filled sudoku which is valid.

The Sudoku board could be partially filled, where empty cells are filled with the character '.'.

Example 1:

Input:
[
  ["5","3",".",".","7",".",".",".","."],
  ["6",".",".","1","9","5",".",".","."],
  [".","9","8",".",".",".",".","6","."],
  ["8",".",".",".","6",".",".",".","3"],
  ["4",".",".","8",".","3",".",".","1"],
  ["7",".",".",".","2",".",".",".","6"],
  [".","6",".",".",".",".","2","8","."],
  [".",".",".","4","1","9",".",".","5"],
  [".",".",".",".","8",".",".","7","9"]
]
Output: true
Example 2:

Input:
[
  ["8","3",".",".","7",".",".",".","."],
  ["6",".",".","1","9","5",".",".","."],
  [".","9","8",".",".",".",".","6","."],
  ["8",".",".",".","6",".",".",".","3"],
  ["4",".",".","8",".","3",".",".","1"],
  ["7",".",".",".","2",".",".",".","6"],
  [".","6",".",".",".",".","2","8","."],
  [".",".",".","4","1","9",".",".","5"],
  [".",".",".",".","8",".",".","7","9"]
]
Output: false
Explanation: Same as Example 1, except with the 5 in the top left corner being 
    modified to 8. Since there are two 8's in the top left 3x3 sub-box, it is invalid.
Note:

A Sudoku board (partially filled) could be valid but is not necessarily solvable.
Only the filled cells need to be validated according to the mentioned rules.
The given board contain only digits 1-9 and the character '.'.
The given board size is always 9x9.

'''
# 2018-6-20
# Valid Sudoko
# X：There have some problem because the question says that each of the 9 3x3 sub-boxes of the grid must contain the digits 1-9 without repetition.
# But this answer will output True even there is 3x3 sub_boxes of grid do not have any digits.
class Solution:
    def isValidSudoku(self, board):
        """
        :type board: List[List[str]]
        :rtype: bool
        """
        dic_row = [{},{},{},{},{},{},{},{},{}]
        dic_col = [{},{},{},{},{},{},{},{},{}]
        dic_box = [{},{},{},{},{},{},{},{},{}]

        for i in range(len(board)):
            for j in range(len(board)):
                num = board[i][j]
                if num == ".":
                    continue
                if num not in dic_row[i] and num not in dic_col[j] and num not in dic_box[3*(i//3)+(j//3)]:
                    dic_row[i][num] = 1
                    dic_col[j][num] = 1
                    dic_box[3*(i//3)+(j//3)][num] = 1
                else:
                    return False
        #print(dic_row)
        #print(dic_col)
        #print(dic_box)

        return True

board = [
  ["5","3",".",".","7",".",".",".","."],
  ["6",".",".","1","9","5",".",".","."],
  [".","9","8",".",".",".",".",".","."],
  ["8",".",".",".","6",".",".",".","."],
  ["4",".",".","8",".","3",".",".","1"],
  ["7",".",".",".","2",".",".",".","6"],
  [".","6",".",".",".",".","2","8","."],
  [".",".",".","4","1","9",".",".","5"],
  [".",".",".",".","8",".",".","7","9"]
]

test = Solution()
res = test.isValidSudoku(board)
print(res)


'''

Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:

Each row must contain the digits 1-9 without repetition.
Each column must contain the digits 1-9 without repetition.
Each of the 9 3x3 sub-boxes of the grid must contain the digits 1-9 without repetition.

A partially filled sudoku which is valid.

The Sudoku board could be partially filled, where empty cells are filled with the character '.'.

Example 1:

Input:
[
  ["5","3",".",".","7",".",".",".","."],
  ["6",".",".","1","9","5",".",".","."],
  [".","9","8",".",".",".",".","6","."],
  ["8",".",".",".","6",".",".",".","3"],
  ["4",".",".","8",".","3",".",".","1"],
  ["7",".",".",".","2",".",".",".","6"],
  [".","6",".",".",".",".","2","8","."],
  [".",".",".","4","1","9",".",".","5"],
  [".",".",".",".","8",".",".","7","9"]
]
Output: true
Example 2:

Input:
[
  ["8","3",".",".","7",".",".",".","."],
  ["6",".",".","1","9","5",".",".","."],
  [".","9","8",".",".",".",".","6","."],
  ["8",".",".",".","6",".",".",".","3"],
  ["4",".",".","8",".","3",".",".","1"],
  ["7",".",".",".","2",".",".",".","6"],
  [".","6",".",".",".",".","2","8","."],
  [".",".",".","4","1","9",".",".","5"],
  [".",".",".",".","8",".",".","7","9"]
]
Output: false
Explanation: Same as Example 1, except with the 5 in the top left corner being 
    modified to 8. Since there are two 8's in the top left 3x3 sub-box, it is invalid.
Note:

A Sudoku board (partially filled) could be valid but is not necessarily solvable.
Only the filled cells need to be validated according to the mentioned rules.
The given board contain only digits 1-9 and the character '.'.
The given board size is always 9x9.

'''
# 2018-6-20
# Valid Sudoko
# X：There have some problem because the question says that each of the 9 3x3 sub-boxes of the grid must contain the digits 1-9 without repetition.
# But this answer will output True even there is 3x3 sub_boxes of grid do not have any digits.
class Solution:
    def isValidSudoku(self, board):
        """
        :type board: List[List[str]]
        :rtype: bool
        """
        dic_row = [{},{},{},{},{},{},{},{},{}]
        dic_col = [{},{},{},{},{},{},{},{},{}]
        dic_box = [{},{},{},{},{},{},{},{},{}]

        for i in range(len(board)):
            for j in range(len(board)):
                num = board[i][j]
                if num == ".":
                    continue
                if num not in dic_row[i] and num not in dic_col[j] and num not in dic_box[3*(i//3)+(j//3)]:
                    dic_row[i][num] = 1
                    dic_col[j][num] = 1
                    dic_box[3*(i//3)+(j//3)][num] = 1
                else:
                    return False
        #print(dic_row)
        #print(dic_col)
        #print(dic_box)

        return True

board = [
  ["5","3",".",".","7",".",".",".","."],
  ["6",".",".","1","9","5",".",".","."],
  [".","9","8",".",".",".",".",".","."],
  ["8",".",".",".","6",".",".",".","."],
  ["4",".",".","8",".","3",".",".","1"],
  ["7",".",".",".","2",".",".",".","6"],
  [".","6",".",".",".",".","2","8","."],
  [".",".",".","4","1","9",".",".","5"],
  [".",".",".",".","8",".",".","7","9"]
]

test = Solution()
res = test.isValidSudoku(board)
print(res)
Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:  Each row must contain the digits 1-9 without repetition. Each column must contain the digits 1-9 without repetition. Each of the 9 3x3 sub-boxes of the grid must contain the digits 1-9 without repetition.  A partially filled sudoku which is valid.  The Sudoku board could be partially filled, where empty cells are filled with the character '.'.  Example 1:  Input: [   ["5","3",".",".","7",".",".",".","."],   ["6",".",".","1","9","5",".",".","."],   [".","9","8",".",".",".",".","6","."],   ["8",".",".",".","6",".",".",".","3"],   ["4",".",".","8",".","3",".",".","1"],   ["7",".",".",".","2",".",".",".","6"],   [".","6",".",".",".",".","2","8","."],   [".",".",".","4","1","9",".",".","5"],   [".",".",".",".","8",".",".","7","9"] ] Output: true Example 2:  Input: [   ["8","3",".",".","7",".",".",".","."],   ["6",".",".","1","9","5",".",".","."],   [".","9","8",".",".",".",".","6","."],   ["8",".",".",".","6",".",".",".","3"],   ["4",".",".","8",".","3",".",".","1"],   ["7",".",".",".","2",".",".",".","6"],   [".","6",".",".",".",".","2","8","."],   [".",".",".","4","1","9",".",".","5"],   [".",".",".",".","8",".",".","7","9"] ] Output: false Explanation: Same as Example 1, except with the 5 in the top left corner being      modified to 8. Since there are two 8's in the top left 3x3 sub-box, it is invalid. Note:  A Sudoku board (partially filled) could be valid but is not necessarily solvable. Only the filled cells need to be validated according to the mentioned rules. The given board contain only digits 1-9 and the character '.'. The given board size is always 9x9. # 2018-6-20 # Valid Sudoko # X：There have some problem because the question says that each of the 9 3x3 sub-boxes of the grid must contain the digits 1-9 without repetition. # But this answer will output True even there is 3x3 sub_boxes of grid do not have any digits. :type board: List[List[str]]         :rtype: bool #print(dic_row) #print(dic_col) #print(dic_box)