Problem033

problem033.rb

#! ruby

buns = []
10.upto(99) do |i|
  i.upto(99) do |j|
    buns << [i, j]
  end
end

results = []
buns.each do |bun|
  1.upto(9) do |i|
    x1, x2 = bun[0].to_f, bun[1]
    y1, y2 = bun[0].to_s.delete(i.to_s).to_f, bun[1].to_s.delete(i.to_s).to_i
    if x1 != x2 && x1 != y1 && x1 / x2 == y1 / y2
      results << bun
    end
  end
end

p result

bunshis = []
bunbos = []
results.each {|a| bunshis << a[0]; bunbos << a[1] }
bunshi = bunshis.inject(:*)
bunbo = bunbos.inject(:*)  

require "mathn"
p bunshi / bunbo
p Rational(bunshi, bunbo)