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 provides
//
// File:  b.go
// Author: ymiyamoto
//
// Created on Thu Jan  3 17:24:32 2019
//
package main

import (
	"fmt"
	"strconv"
)

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

	ans := 0
	for i := 1; i <= N; i++ {
		s := strconv.Itoa(i)

		sum := 0
		for i := range s {
			sum += int(s[i] - '0')
		}
		if A <= sum && sum <= B {
			ans += i
		}
	}
	fmt.Println(ans)
}