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
fscanf(STDIN, "%d %d %d", $N, $A, $B);

$ans = 0;

for ($i = 1; $i <= $N; $i++) {
    $str = strval($i);
    $arr = str_split($str);
    // var_dump($arr);
    $ttl = array_sum($arr);
    // printf("%d %d\n", $i, $ttl);
    if ($ttl >= $A && $ttl <= $B) {
        // printf("%d\n", $i);
        $ans += $i;
    }
}

echo $ans . "\n";