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Sudoku v2

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Sudoku is a number puzzle where a grid of 81 digits (9x9) is filled by the digits 1-9 such that no row, column, or 3x3 subregion contains duplicate digits.

Write a program that given an incomplete Sudoku board as an argument, prints the solved Sudoku board. The grid will be drawn with 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 ┃
┗━━━┷━━━┷━━━┻━━━┷━━━┷━━━┻━━━┷━━━┷━━━┛
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Compiled from AT&T syntax to x86-64 Linux. Use syscalls to write output. For accurate byte counts and syntax highlighting, please use the new editor.
Top-level programs are supported, args holds ARGV.
Arguments are available via STDIN, each argument is NULL terminated. Taking input after EOF leaves the cell unchanged, the tape is circular with 65536 cells, and cells are 8-bit with wrapping.
Arguments are available via STDIN, each argument is NULL terminated. x is a no-op.
Arguments are available via STDIN, each argument is NULL terminated.
arguments holds ARGV, print() to output with a newline, write() to output without a newline.
say() is available without any import.
$args to access the arguments.
SELECT arg FROM argv to access the arguments, only the first column of the first result set will be printed, NULL values will be skipped, and the dialect is SQLite.
Arguments are available via args list variable. To terminate script execution, write and quit the current buffer.
ctrl + enter or Run