Validate Sudoku Board | Dataford Interview Questions

How would you implement a function to validate a Sudoku board?

Implement validate_sudoku(board), which receives a 9x9 list of lists. Each cell contains a digit from "1" to "9" or "." for empty. Return True if no digit appears more than once in any row, column, or 3x3 subgrid; otherwise return False. The board does not need to be solvable.

Constraints

board has exactly 9 rows
Each row has exactly 9 cells
Each cell is a digit from "1" to "9" or "."
The board may be partially filled
The board does not need to be solvable

Function Signature

def validate_sudoku(board):

Your question is Validate Sudoku Board. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

How would you implement a function to validate a Sudoku board?

Constraints

board has exactly 9 rows
Each row has exactly 9 cells
Each cell is a digit from "1" to "9" or "."
The board may be partially filled
The board does not need to be solvable

Function Signature

def validate_sudoku(board):

Your question is Validate Sudoku Board. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.