test.rb

# test.rb

def test vv={a: 1, b: 2, c: 3, d: 4, e: 5}
    res= tmp= {}
    #res={}; tmp={}
    loop do
      break if vv.empty?
      vv.each do |a, v|
        v= v.to_f
        if a.to_s.ord.odd?
          res[a]= (res[a]||0) + v
        else
          tmp[(a.to_s.ord+1).chr.to_sym]= (tmp[(a.to_s.ord+1).chr.to_sym]||0) + v
        end
      end
      vv, tmp= tmp, {}
    end
  res
end

def test2 vv={a: 1, b: 2, c: 3, d: 4, e: 5}
    #res= tmp= {}
    res={}; tmp={}
    loop do
      break if vv.empty?
      vv.each do |a, v|
        v= v.to_f
        if a.to_s.ord.odd?
          res[a]= (res[a]||0) + v
        else
          tmp[(a.to_s.ord+1).chr.to_sym]= (tmp[(a.to_s.ord+1).chr.to_sym]||0) + v
        end
      end
      vv, tmp= tmp, {}
    end
  res
end


p test==test2