挑戦者求む！【言語指定】Restricted Words by @cielavenir cielavenir│CodeIQ https://codeiq.jp/ace/cielavenir/q431 の私の回答です。

hello.rb

#!/usr/bin/env ruby
# encoding : utf-8

# Timeの現在時刻のUNIXタイムから、まず0と1を作る
time = Time.now.to_i

zero = time
one = time
if time.zero?
  # zero = time
  one =  - ~time # ~0が-1なのでそのまた-で+1
else
  zero = time - time
  one = (time ** zero).abs # timeが負ならばtime ** zeroは-1となるのでabs
end

# 2, 4, 8, 16, 32, 64を作る
two = one + one
four = two * two
eight = four * two
sixteen = eight * two
thirtytwo = sixteen * two
sixtyfour = thirtytwo * two

# 配列に、上記の1, 2, 4, 8, 32, 64を使ってASCIIコードの値を直に計算値として入れていく
str = Array.new
str.push(sixtyfour + eight) # H
str.push(sixtyfour + thirtytwo + four + one) # e
str.push(sixtyfour + thirtytwo + eight + four) # l
str.push(sixtyfour + thirtytwo + eight + four) # l
str.push(sixtyfour + thirtytwo + eight + four + two + one) # o
str.push(thirtytwo) # SP
str.push(sixtyfour + sixteen + four + two + one) # W
str.push(sixtyfour + thirtytwo + eight + four + two + one) # o
str.push(sixtyfour + thirtytwo + sixteen + two) # r
str.push(sixtyfour + thirtytwo + eight + four) # l
str.push(sixtyfour + thirtytwo + four) # d
str.push(eight + two) # LF

# 出来た配列を順にASCII文字として表示していく
str.each { |c| print c.chr }