AIZU ONLINE JUDGE: Programming ChallengeITP1_1_A puts "Hello World" ITP1_1_B x = gets.to_i puts x ** 3 ITP1_1_C a, b = gets.split.map(&:to_i) puts "#{a * b} #{2 * (a + b)}" ITP1_1_D n = gets.to_i puts "#{n / 3600}:#{(n % 3600) / 60}:#{n % …