Даны целое число k (1amp;lt;= kamp;lt;= 150) и последовательность цифр101102103...149150, в

Ruby 2

def getNumberByPosition(start_num, end_num, k, n = 3)

    p [start_num, end_num, k, n]

   if not start_num.between?(10**(n - 1),10**n - 1) or not end_num.between?(10**(n - 1),10**n - 1) then return end

   s = ""

   for  i in start_num..end_num

       s += i.to_s()

   end

   number = start_num + (k-1) / n

   if number gt; end_num

       puts "Выход за пределы"

       return

   end

    p number

   upper_limit = n + 1 - ((k % n == 0) ? n : k % n)

   number = number % (10**upper_limit)

    p [number, 10**upper_limit, upper_limit]

   low_limit = upper_limit - 1

   number = number / (10**low_limit)

    p [number, 10**low_limit, low_limit]

   puts "number = s[k-1]"

end

getNumberByPosition(101,150,20,3)

getNumberByPosition(101,150,21,3)