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 PHP (7.4.4) (judge verdict: Wrong Answer)

<?php
  list($n,$a,$b) = explode(" ", trim(fgets(STDIN)));

  $ans=0;
  for ($i=1; $i<=$n; $i++) {
    $x=intdiv($i,10000);
    $x=intdiv($i%10000,1000);
    $x+=intdiv($i%1000, 100);
    $x+=intdiv($i%100, 10);
    $x+=$i%10;
    
    if($a<=$x && $x<=$b){
//    echo $i." ".$x.PHP_EOL;
      $ans+=$i;
    }
  }

  echo $ans.PHP_EOL;