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 Haskell (GHC 7.10.3) (judge verdict: Accepted)

import Data.Char (digitToInt)

main :: IO ()
main = do
    [n,a,b] <- map read .words <$> getLine
    print . sum $ nums n a b

nums :: Int -> Int -> Int -> [Int]
nums n a b = filter (between a b . sumDigits) [1..n]

between :: Ord a => a -> a -> a -> Bool
between a b s = a <= s && s <= b

sumDigits :: Int -> Int
sumDigits = sum . map digitToInt . show