Sudoku

sample.unsolved.txt

105802000090076405200400819019007306762083090000061050007600030430020501600308900
005030081902850060600004050007402830349760005008300490150087002090000600026049503
105802000090076405200400819019007306762083090000061050007600030430020501600308900
005030081902850060600004050007402830349760005008300490150087002090000600026049503
290500007700000400004738012902003064800050070500067200309004005000080700087005109
080020000040500320020309046600090004000640501134050700360004002407230600000700450
608730000200000460000064820080005701900618004031000080860200039050000100100456200
370000001000700005408061090000010000050090460086002030000000000694005203800149500
000689100800000029150000008403000050200005000090240801084700910500000060060410000
030500804504200010008009000790806103000005400050000007800000702000704600610300500
096040001100060004504810390007950043030080000405023018010630059059070830003590007
000075400000000008080190000300001060000000034000068170204000603900000020530200000
300000000050703008000028070700000043000000000003904105400300800100040000968000200
302609005500730000000000900000940000000000109000057060008500006000000003019082040

sudoku.rb

class Sudoku
  def initialize(board_string)
  end

  def solve!
  end

  # Returns a string representing the current state of the board
  # Don't spend too much time on this method; flag someone from staff
  # if you are.
  def board

  end
end

# The file has newlines at the end of each line, so we call
# String#chomp to remove them.
board_string = File.readlines('sample.unsolved.txt').first.chomp

game = Sudoku.new(board_string)

# Remember: this will just fill out what it can and not "guess"
game.solve!

puts game.board