HackerRank: Sherlock and The Beast

sherlock_beast.rb

def validate(count)
    result = nil
    count.downto(0).each do |j|
        i = count - j
        if j == count && j % 3 == 0
            result = Array.new(j, 5)
        elsif i % 5 == 0 && j % 3 == 0
            result = Array.new(j, 5) + Array.new(i, 3)
        elsif i == count && i % 5 == 0
            result = Array.new(i, 3)
        end
        
        break if result
    end
    
    if result.nil?
        puts -1
    else
        puts result.join()
    end
end

number = gets.to_i
number.times do |i|
    validate gets.to_i
end