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 (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

var stdin = bufio.NewScanner(os.Stdin)

func main() {
	var o int
	arr := scanArrayInt()
	n, a, b := arr[0], arr[1], arr[2]
	for i := 1; i <= n; i++ {
		t, d := 0, i
		for {
			t, d = t+d%10, d/10
			if d == 0 {
				break
			}
		}
		if a <= t && t <= b {
			o += i
		}
	}
	fmt.Println(o)
}

func scanArrayInt() []int {
	var ret = []int{}
	stdin.Scan()
	for _, s := range strings.Split(stdin.Text(), " ") {
		i, _ := strconv.Atoi(s)
		ret = append(ret, i)
	}
	return ret
}