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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int end = sc.nextInt();
    int min = sc.nextInt();
    int max = sc.nextInt();
    sc.close();

    long sum = 0;

    for (int i = 1; i <= end; i++) {
      int x = getXxx(i);

      if (min <= x && x <= max) {
        sum += i;
      }
    }

    System.out.println(sum);
    
  }

  private static int getXxx(int num) {

    int result = 0;

    while(num > 0) {
      result += num % 10;
      num /= 10;
    }

    return result;

  }
}