ProjectEuler #11

gistfile1.rb

number_split = Array.new
number_ary = Array.new
number_list = open("./problem11_num")
max = 0
ans = 0

while number_data = number_list.gets
  number_split << number_data.chomp
end

(0..number_split.length - 1).each do |e|
  number_ary << number_split[e].split(' ').map { |e| e.to_i }
end

(0..16).each do |x|
  (0..19).each do |y|
    ans = number_ary[y][x] * number_ary[y][x+1] * number_ary[y][x+2] * number_ary[y][x+3]
    max = ans if ans > max
  end
end

(0..19).each do |x|
  (0..16).each do |y|
    ans = number_ary[y][x] * number_ary[y+1][x] * number_ary[y+2][x] * number_ary[y+3][x]
    max = ans if ans > max
  end
end

(0..16).each do |x|
  (0..16).each do |y|
    ans = number_ary[y][x] * number_ary[y+2][x+2] * number_ary[y+2][x+2] * number_ary[y+3][x+3]
    max = ans if ans > max
  end
end

(0..16).each do |x|
  (0..16).each do |y|
    ans = number_ary[y][x+3] * number_ary[y+1][x+2] * number_ary[y+2][x+1] * number_ary[y+3][x]
    max = ans if ans > max
  end
end

p max