Sudoku Solver Sudoku Solver
Moderate
English

Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row and each 3×3 sub-grid contains all of the digits from 1 to 9. The puzzle creator provides a partially completed grid, which typically has a unique solution.

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For example, the following grid

initial_grid gives the result: result_grid

initial_grid
gives the result:
result_grid

A puzzle is represented as a list of lists with digits. A zero value means that the value hasn't been set.

Input: The initial 9x9 grid composed by integers as a list of lists.

Output: The result of the sudoku as a list of lists.

Example:

    checkio([[5, 0, 0, 7, 1,...
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