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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        List<int> NAB = Console.ReadLine().Split(' ').Select(o => int.Parse(o)).ToList();
        int N = NAB[0], A = NAB[1], B = NAB[2];

        int sum = 0;
        for (int i = 1, j = 1, dsum = 0; i <= N; i++, j = i, dsum = 0)
        {
            while (j != 0)
            {
                dsum += j % 10;
                j /= 10;
            }
            if (A <= dsum && dsum <= B)
                sum += i;
        }

        Console.WriteLine(sum);
    }
}