class Untoutiyaumahe

# File lib/Untoutiyaumahe.rb, line 27
def self.inverse_untoutiyaumahe(array, untoutiyaumahe)
        toukentai = untoutiyaumahe[0]
        hisiri = untoutiyaumahe[1]

        num = array.take(toukentai).to_i.inject(:+) + hisiri
end

# File lib/Untoutiyaumahe.rb, line 3
def self.untoutiyaumahe(num, array)

        sums = array.map.with_index do |v, k|
                array.take(k + 1).inject(:+)
        end

        deltas = sums.map do |i|
                num - i
        end

        positives = deltas.select do |i|
                0 <= i
        end

        toukentai = positives.size

        if toukentai == 0 then
                hisiri = num
        else
                hisiri = positives[-1]
        end
        [toukentai, hisiri]
end