Last active
August 29, 2015 14:18
-
-
Save kahdojay/6531bbf8d6ad228b4634 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class Sudoku | |
def initialize(board_string) | |
@original_string = board_string | |
@guess_cache = [] | |
@board = [] | |
board_string.split('').each_slice(9) { |row| @board << row.map { | |
|num| num.to_i } } | |
end | |
def solve! | |
@board.each_with_index do |row_value, row_index| | |
row_value.each_with_index do |cell_value, cell_index| | |
if blank?(cell_value) && get_possibilities(row_index, cell_index).length == 1 | |
row_value[cell_index] = get_possibilities(row_index, cell_index).pop | |
solve! | |
end | |
end | |
end | |
guess_coords = find_zeros | |
until any_zeros? == false | |
coord = guess_coords.pop | |
@guess_cache = get_possibilities(coord[0], coord[1]) | |
guess(coord) | |
end | |
end | |
def guess(coord) | |
if @guess_cache.length > 0 | |
@board[coord[0]][coord[1]] = @guess_cache.pop | |
solve! | |
end | |
return @board if any_zeros? == false | |
if any_zeros? | |
reset | |
end | |
return if @guess_cache.length == 0 | |
guess | |
end | |
def board | |
@board.flatten.join('') | |
end | |
def to_s | |
puts "______BOARD______" | |
@board.each {|row| puts row.join(' ')} | |
end | |
def blank?(number) | |
number.eql?(0) ? true : false | |
end | |
def get_horizontal(r_index) | |
@board[r_index] | |
end | |
def get_vertical(c_index) | |
@board.map { |row| row[c_index] } | |
end | |
def get_possibilities(r_index, c_index) | |
valid_numbers = (1..9).to_a | |
horizontal = valid_numbers - get_horizontal(r_index) | |
vertical = valid_numbers - get_vertical(c_index) | |
box = valid_numbers - get_box(r_index, c_index) | |
horizontal & vertical & box | |
end | |
def find_zeros | |
guess_coordinates = [] | |
@board.each_with_index do |row_value, row_index| | |
row_value.each_with_index do |cell_value, cell_index| | |
if cell_value == 0 | |
guess_coordinates << [row_index, cell_index] | |
end | |
end | |
end | |
guess_coordinates | |
end | |
def any_zeros? | |
return true if self.find_zeros.length > 0 | |
return false if self.find_zeros.length == 0 | |
end | |
def reset | |
initialize(@original_string) | |
end | |
def get_box(r_index, c_index) | |
box1 = [@board[0][0], @board[0][1], @board[0][2], | |
@board[1][0], @board[1][1], @board[1][2], | |
@board[2][0], @board[2][1], @board[2][2]] | |
box2 = [@board[0][3], @board[0][4], @board[0][5], | |
@board[1][3], @board[1][4], @board[1][5], | |
@board[2][3], @board[2][4], @board[2][5]] | |
box3 = [@board[0][6], @board[0][7], @board[0][8], | |
@board[1][6], @board[1][7], @board[1][8], | |
@board[2][6], @board[2][7], @board[2][8]] | |
box4 = [@board[3][0], @board[3][1], @board[3][2], | |
@board[4][0], @board[4][1], @board[4][2], | |
@board[5][0], @board[5][1], @board[5][2]] | |
box5 = [@board[3][3], @board[3][4], @board[3][5], | |
@board[4][3], @board[4][4], @board[4][5], | |
@board[5][3], @board[5][4], @board[5][5]] | |
box6 = [@board[3][6], @board[3][7], @board[3][8], | |
@board[4][6], @board[4][7], @board[4][8], | |
@board[5][6], @board[5][7], @board[5][8]] | |
box7 = [@board[6][0], @board[6][1], @board[6][2], | |
@board[7][0], @board[7][1], @board[7][2], | |
@board[8][0], @board[8][1], @board[8][2]] | |
box8 = [@board[6][3], @board[6][4], @board[6][5], | |
@board[7][3], @board[7][4], @board[7][5], | |
@board[8][3], @board[8][4], @board[8][5]] | |
box9 = [@board[6][6], @board[6][7], @board[6][8], | |
@board[7][6], @board[7][7], @board[7][8], | |
@board[8][6], @board[8][7], @board[8][8]] | |
if (0..2).include?(r_index) && (0..2).include?(c_index) | |
return box1 | |
elsif (0..2).include?(r_index) && (3..5).include?(c_index) | |
return box2 | |
elsif (0..2).include?(r_index) && (6..8).include?(c_index) | |
return box3 | |
elsif (3..5).include?(r_index) && (0..2).include?(c_index) | |
return box4 | |
elsif (3..5).include?(r_index) && (3..5).include?(c_index) | |
return box5 | |
elsif (3..5).include?(r_index) && (6..8).include?(c_index) | |
return box6 | |
elsif (6..8).include?(r_index) && (0..2).include?(c_index) | |
return box7 | |
elsif (6..8).include?(r_index) && (3..5).include?(c_index) | |
return box8 | |
elsif (6..8).include?(r_index) && (6..8).include?(c_index) | |
return box9 | |
else | |
return nil | |
end | |
end | |
end | |
# Test boards, increasing in difficulty, uncomment one game at a time to test: | |
# game = Sudoku.new('619030040270061008000047621486302079000014580031009060005720806320106057160400030') | |
# game = Sudoku.new('310609005500730000000000900000940000000000109000057060008500006000000003019082040') | |
# game = Sudoku.new('096040001100060004504810390007950043030080000405023018010630059059070830003590007') | |
# game = Sudoku.new('105802000090076405200400819019007306762083090000061050007600030430020501600308900') | |
# game = Sudoku.new('005030081902850060600004050007402830349760005008300490150087002090000600026049503') | |
# game = Sudoku.new('096040001100060004504810390007950043030080000405023018010630059059070830003590007') | |
# game = Sudoku.new('105802000090076405200400819019007306762083090000061050007600030430020501600308900') | |
# game = Sudoku.new('005030081902850060600004050007402830349760005008300490150087002090000600026049503') | |
# game = Sudoku.new('290500007700000400004738012902003064800050070500067200309004005000080700087005109') | |
# game = Sudoku.new('080020000040500320020309046600090004000640501134050700360004002407230600000700450') | |
# game = Sudoku.new('608730000200000460000064820080005701900618004031000080860200039050000100100456200') | |
# game = Sudoku.new('370000001000700005408061090000010000050090460086002030000000000694005203800149500') | |
# game = Sudoku.new('000689100800000029150000008403000050200005000090240801084700910500000060060410000') | |
# game = Sudoku.new('030500804504200010008009000790806103000005400050000007800000702000704600610300500') | |
# game = Sudoku.new('000075400000000008080190000300001060000000034000068170204000603900000020530200000') | |
# game = Sudoku.new('300000000050703008000028070700000043000000000003904105400300800100040000968000200') | |
# game = Sudoku.new('302609005500730000000000900000940000000000109000057060008500006000000003019082040') | |
p "#{game.find_zeros.length} zeros" | |
game.to_s | |
game.solve! | |
game.to_s |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment