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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"fmt"
	"strconv"
)

func solve() {
	var N, A, B int
	fmt.Scan(&N, &A, &B)

	ans := 0
	for i := 1; i <= N; i++ {
		si := strconv.FormatInt(int64(i), 10)
		c := 0
		for _, s := range si {
			po, _ := strconv.ParseInt(string(s), 10, 64)
			c += int(po)
		}
		if A <= c && c <= B {
			ans += i
		}

	}
	fmt.Println(ans)
}

func main() {
	solve()
}