64 lines
1.1 KiB
Ruby
64 lines
1.1 KiB
Ruby
# @param {Character[][]} board
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# @return {Boolean}
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def is_valid_sudoku(board)
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# Check rows
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return false unless sudoku_rows_valid?(board)
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# Check columns
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return false unless sudoku_columns_valid?(board)
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# Check sub-boxes
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return false unless sudoku_sub_boxes_valid?(board)
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true
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end
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def sudoku_rows_valid?(board)
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board.each do |row|
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digits = []
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row.each do |cell|
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return false if digits.include?(cell)
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digits.push(cell) if cell != '.'
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end
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end
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true
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end
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def sudoku_columns_valid?(board)
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9.times do |i|
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digits = []
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board.each do |row|
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cell = row[i]
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return false if digits.include?(cell)
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digits.push(cell) if cell != '.'
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end
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end
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true
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end
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def sudoku_sub_boxes_valid?(board)
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3.times do |i|
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# Select 3 rows
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rows = board[i * 3..i * 3 + 2]
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3.times do |j|
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digits = []
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rows.each do |row|
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# Select 3 columns
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cols = row[j * 3..j * 3 + 2]
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cols.each do |cell|
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return false if digits.include?(cell)
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digits.push(cell) if cell != '.'
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end
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end
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end
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end
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true
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end
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