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
$input_line = trim(fgets(STDIN));
$input_line = explode(' ', $input_line);

$n = $input_line[0];
$a = $input_line[1];
$b = $input_line[2];

$ans_sum = 0;

for ($i = 1; $i <= $n; $i++) {
  $sum = 0;
  $num_strlen = str_split(strval($i));
  foreach ($num_strlen as $v) {
    $sum += intval($v);
  }
  if ($sum >= $a && $sum <= $b) {
    $ans_sum += $i;
  }
}

print $ans_sum;