Adding reverse numbers. Solution for the task from ACM Central European Programming Contest, Prague 1998 http://www.spoj.pl/problems/ADDREV/

addrev.rb

def addrev(n) 
  b = 0
	n.split(' ').each do |a|
		b+= a.to_s.reverse.to_i
	end
	return b.to_s.reverse.to_i
end

a = true
i = j = 0
out = []

$stdin.each_line do |line|
	if(!a) then 
		if(j != i)
			out.push(addrev(line.to_s))
			j += 1
		else
			break
		end
	else
		i = line.to_i
		a = false
	end
end

out.each do |b| 
	$stdout << b << "\n" 
end