# Recca Chao 的 gitHub page

## 推廣網站開發，包含 Laravel 和 Kotlin 後端撰寫、自動化測試、讀書心得等。Taiwan Kotlin User Group 管理員。

A Sudoku board is a 9x9 grid, where each row, column and each 3x3 subbox contains the number from 1-9. Here’s an example of a Sudoku board.

``````-------------
|534|678|912|
|672|195|348|
|198|342|567|
|------------
|859|761|423|
|426|853|791|
|713|924|856|
|------------
|961|537|284|
|287|419|635|
|345|286|179|
|------------
``````

Given a 9x9 board, determine if it is a valid Sudoku board. The board may be partially filled, where an empty cell will be represented by the space character ’ ’.

Here’s an example and some starting code:

``````def validate_sudoku(board):
# Fill this in.

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

print(validate_sudoku(board))
# True
``````