{ "data": { "question": { "questionId": "37", "questionFrontendId": "37", "boundTopicId": null, "title": "Sudoku Solver", "titleSlug": "sudoku-solver", "content": "

Write a program to solve a Sudoku puzzle by filling the empty cells.

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A sudoku solution must satisfy all of the following rules:

\n\n
    \n\t
  1. Each of the digits 1-9 must occur exactly once in each row.
    2. \n\t
  2. Each of the digits 1-9 must occur exactly once in each column.
    3. \n\t
  3. Each of the digits 1-9 must occur exactly once in each of the 9 3x3 sub-boxes of the grid.
    4. \n
\n\n

The '.' character indicates empty cells.

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Example 1:

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\nInput: board = [["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"]]\nOutput: [["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"]]\nExplanation: The input board is shown above and the only valid solution is shown below:\n\n\n
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Constraints:

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