Problem:
Score : 200 points

Problem Statement

Find the sum of the integers between 1 and N (inclusive), whose sum of digits written in base 10 is between A and B (inclusive).

Constraints

1 \leq N \leq 10^4

1 \leq A \leq B \leq 36

All input values are integers.

Input

Input is given from Standard Input in the following format:

N A B

Output

Print the sum of the integers between 1 and N (inclusive), whose sum of digits written in base 10 is between A and B (inclusive).

Sample Input 1

20 2 5

Sample Output 1

84

Among the integers not greater than 20, the ones whose sums of digits are between 2 and 5, are: 2,3,4,5,11,12,13,14 and 20. We should print the sum of these, 84.

Sample Input 2

10 1 2

Sample Output 2

13

Sample Input 3

100 4 16

Sample Output 3

4554

Solution in Scala (2.13.1) (judge verdict: Accepted)


object Main extends App {
  
  val sc = new java.util.Scanner(System.in)
  val n, a, b = sc.nextInt()
  var  ans = 0
  for (i <- 1 to n) {
    val sum = i.toString.toList.foldLeft(0)((x, y) => x + y.asDigit)
    if (a <= sum && sum <= b) {
      ans += i
    }
  }
  println(ans)
}