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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php
// 1以上N以下の整数のうち、10進法での各桁の和がA以上B以下であるものの総和を出力せよ。
$nab = explode(' ', trim(fgets(STDIN)));
$n   = $nab[0];
$a   = $nab[1];
$b   = $nab[2];

$sum = 0;
for ($i = 1; $i <= $n; $i++) {
    $sum_digit = sumEachDigit($i);
    if ($sum_digit >= $a && $sum_digit <= $b) {
        $sum += $i;
    }
}

print "$sum\n";

function sumEachDigit(int $number)
{
    $sum = 0;
    while ($number !== 0) {
        $sum    += $number % 10;
        $number = intdiv($number, 10);
    }
    return $sum;
}