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58 lines
1.2 KiB
Markdown
58 lines
1.2 KiB
Markdown
# sudoku
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Created by [@theoludwig](https://github.com/theoludwig) on 6 July 2021.
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## Instructions
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Sudoku is a logic-based, combinatorial number-placement puzzle.
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The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.
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You can't use the same numbers twice in a:
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- row
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- column
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- square of 3x3
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Write a program that solves the Sudoku given in input.
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The empty cells are represented by 0.
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## Source
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[Wikipedia - Sudoku](https://en.wikipedia.org/wiki/Sudoku)
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## Examples
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See the `test` folder for examples of input/output.
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### Example 1
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#### Input
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```txt
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5 3 0 0 7 0 0 0 0
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6 0 0 1 9 5 0 0 0
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0 9 8 0 0 0 0 6 0
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8 0 0 0 6 0 0 0 3
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4 0 0 8 0 3 0 0 1
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7 0 0 0 2 0 0 0 6
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0 6 0 0 0 0 2 8 0
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0 0 0 4 1 9 0 0 5
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0 0 0 0 8 0 0 7 9
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```
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#### Output
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```txt
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5 3 4 6 7 8 9 1 2
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6 7 2 1 9 5 3 4 8
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1 9 8 3 4 2 5 6 7
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8 5 9 7 6 1 4 2 3
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4 2 6 8 5 3 7 9 1
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7 1 3 9 2 4 8 5 6
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9 6 1 5 3 7 2 8 4
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2 8 7 4 1 9 6 3 5
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3 4 5 2 8 6 1 7 9
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```
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