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Sudoku is a number puzzle where a grid of 81 digits (9×9) is filled by the digits 1-9 such that no row, column, or 3×3 subregion contains duplicate digits.
Write a program that given an incomplete Sudoku board as 9 arguments of 9 digits, with blanks represented by an underscore, prints a solved Sudoku grid using Unicode box-drawing characters like so:
┏━━━┯━━━┯━━━┳━━━┯━━━┯━━━┳━━━┯━━━┯━━━┓ ┃ 2 │ 5 │ 8 ┃ 4 │ 1 │ 7 ┃ 6 │ 9 │ 3 ┃ ┠───┼───┼───╂───┼───┼───╂───┼───┼───┨ ┃ 6 │ 1 │ 7 ┃ 9 │ 2 │ 3 ┃ 8 │ 5 │ 4 ┃ ┠───┼───┼───╂───┼───┼───╂───┼───┼───┨ ┃ 9 │ 3 │ 4 ┃ 8 │ 6 │ 5 ┃ 1 │ 7 │ 2 ┃ ┣━━━┿━━━┿━━━╋━━━┿━━━┿━━━╋━━━┿━━━┿━━━┫ ┃ 3 │ 2 │ 5 ┃ 7 │ 8 │ 1 ┃ 4 │ 6 │ 9 ┃ ┠───┼───┼───╂───┼───┼───╂───┼───┼───┨ ┃ 8 │ 9 │ 6 ┃ 3 │ 5 │ 4 ┃ 2 │ 1 │ 7 ┃ ┠───┼───┼───╂───┼───┼───╂───┼───┼───┨ ┃ 7 │ 4 │ 1 ┃ 6 │ 9 │ 2 ┃ 5 │ 3 │ 8 ┃ ┣━━━┿━━━┿━━━╋━━━┿━━━┿━━━╋━━━┿━━━┿━━━┫ ┃ 4 │ 6 │ 9 ┃ 1 │ 3 │ 8 ┃ 7 │ 2 │ 5 ┃ ┠───┼───┼───╂───┼───┼───╂───┼───┼───┨ ┃ 5 │ 7 │ 3 ┃ 2 │ 4 │ 6 ┃ 9 │ 8 │ 1 ┃ ┠───┼───┼───╂───┼───┼───╂───┼───┼───┨ ┃ 1 │ 8 │ 2 ┃ 5 │ 7 │ 9 ┃ 3 │ 4 │ 6 ┃ ┗━━━┷━━━┷━━━┻━━━┷━━━┷━━━┻━━━┷━━━┷━━━┛
Variants: Sudoku v2
External links: Rosetta Code, Wikipedia
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