Sudoku 1 pseudocode

pseudoku.txt

 ☐ create variable containing options [1-9]
 ☐ look at first row and see what numbers from 1-9 are missing
 ☐ then look at column and see what else is missing
 ☐ finally, check the box
 ☐ (note that we're removing values from 'options' every time we check)
 ☐ compare what's missing to our options
 ☐ when options.size == 1, then we know that that's the answer
 ☐ if not, then move on to next empty cell

OPTIONS = [1,2,3,4,5,6,7,8,9]

for num in options
if row(0).to_a.include?(num)
  OPTIONS.delete_if {|option| option.include?(num) } 
end

column(4).to_a.include?(num)

 ☐ create an array of the submatrix

OPTIONS = [2,5]

 ☐ if OPTIONS.length == 1, then place option into empty spot, ELSE, reset options and proceed to next empty spot