How should I practice Validate Completed Sudoku?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Apple online assessment problems in FastPrep.

Is Validate Completed Sudoku associated with Apple?

FastPrep tags this as a Apple coding interview or online assessment practice problem when the problem catalog has that company context.

Problem · Matrix

Validate Completed Sudoku

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Problem statement

You are given a completed 9 x 9 Sudoku board. Return true if the board is valid, meaning every row, every column, and every 3 x 3 sub-grid contains no duplicate digits and follows Sudoku rules. Otherwise return false.

Function

isCompletedSudokuValid(board: String[][]) → boolean

Examples

Example 1

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

Every row, column, and 3 x 3 sub-grid contains each digit exactly once.

The source shared the rule but did not include this exact sample. FastPrep added this small example so the behavior can be checked directly.

Problem statement

Function

Examples

Example 1

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