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ext/wasm/sql/001-sudoku.sql
28 строк
892 B
stephan
Minor cleanups in OO API #1. Add Sudoku SQL to batch-runner.js's list.
05 сен 2022, 16:24
05 сен 2022, 16:24
49cb8d7
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WITH RECURSIVE input(sud) AS ( VALUES('53..7....6..195....98....6.8...6...34..8.3..17...2...6.6....28....419..5....8..79') ), digits(z, lp) AS ( VALUES('1', 1) UNION ALL SELECT CAST(lp+1 AS TEXT), lp+1 FROM digits WHERE lp<9 ), x(s, ind) AS ( SELECT sud, instr(sud, '.') FROM input UNION ALL SELECT substr(s, 1, ind-1) || z || substr(s, ind+1), instr( substr(s, 1, ind-1) || z || substr(s, ind+1), '.' ) FROM x, digits AS z WHERE ind>0 AND NOT EXISTS ( SELECT 1 FROM digits AS lp WHERE z.z = substr(s, ((ind-1)/9)*9 + lp, 1) OR z.z = substr(s, ((ind-1)%9) + (lp-1)*9 + 1, 1) OR z.z = substr(s, (((ind-1)/3) % 3) * 3 + ((ind-1)/27) * 27 + lp + ((lp-1) / 3) * 6, 1) ) ) SELECT s FROM x WHERE ind=0;