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class Variable
def initialize(domain)
@domain = domain
end
def fixed?
if @domain.length == 1
@domain[0]
else
false
end
end
def include?(x)
@domain.include?(x)
end
def fix(x)
@domain = [x]
end
def eliminate(x)
@domain.delete(x) unless fixed?
end
end
def sudokuprint(grid, subsize, size = subsize * subsize)
w = Math.log10(size).ceil
bar = '┼ ┼' + (('─' * (subsize * (w + 1) + 1) + '┼') * subsize + ' ┼') * subsize
puts bar
puts bar
(0...size).step(subsize).each do |rs|
(rs...(rs + subsize)).each do |r|
(1..size).step(subsize).each do |ds|
print '│ │ '
(0...size).step(subsize).each do |b|
(b...(b + subsize)).each do |c|
(ds...(ds + subsize)).each do |d|
print (grid[r][c].include?(d) ? ("%#{w}d" % d) : (' ' * w)) + ' '
end
print '│ '
end
print '│ '
end
puts
end
puts bar
end
puts bar
end
end
SUBSIZE = 3
SIZE = SUBSIZE * SUBSIZE
boxes = []
(0...SIZE).step(SUBSIZE).each do |r|
(0...SIZE).step(SUBSIZE).each do |c|
boxes.push([r, c])
end
end
grid = Array.new(SIZE) {
Array.new(SIZE) {
Variable.new((1..SIZE).to_a)
}
}
grid[0][3].fix(2)
grid[0][4].fix(9)
grid[0][5].fix(4)
grid[0][6].fix(3)
grid[0][8].fix(5)
grid[1][0].fix(9)
grid[1][1].fix(5)
grid[1][3].fix(6)
grid[1][5].fix(8)
grid[1][6].fix(7)
grid[1][8].fix(2)
grid[2][2].fix(3)
grid[2][7].fix(8)
grid[3][1].fix(8)
grid[3][8].fix(4)
grid[4][1].fix(6)
grid[4][3].fix(9)
grid[4][5].fix(1)
grid[4][7].fix(7)
grid[5][0].fix(4)
grid[5][7].fix(5)
grid[6][1].fix(1)
grid[6][6].fix(2)
grid[7][0].fix(2)
grid[7][2].fix(6)
grid[7][3].fix(5)
grid[7][5].fix(3)
grid[7][7].fix(9)
grid[7][8].fix(8)
grid[8][0].fix(3)
grid[8][2].fix(7)
grid[8][3].fix(1)
grid[8][4].fix(8)
grid[8][5].fix(2)
until grid.flatten.count(&:fixed?) == 81
(0...SIZE).each do |i|
row = grid[i]
row.each do |cell|
if v = cell.fixed?
row.each do |c2|
c2.eliminate(v)
end
end
end
end
(0...SIZE).each do |i|
col = grid.map { |row| row[i] }
col.each do |cell|
if v = cell.fixed?
col.each do |c2|
c2.eliminate(v)
end
end
end
end
(0...SIZE).each do |i|
rs, cs = boxes[i]
box = []
(rs...(rs + SUBSIZE)).each do |r|
(cs...(cs + SUBSIZE)).each do |c|
box.push(grid[r][c])
end
end
box.each do |cell|
if v = cell.fixed?
box.each do |c2|
c2.eliminate(v)
end
end
end
end
end
sudokuprint(grid, SUBSIZE, SIZE)
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