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- <?php
- $number = strrev(readline());
- $digit = intval(readline());
- $residue = 0;
- $multiply = 1;
- if ($number == "0" || $digit == 0) {
- echo "0";
- return;
- }
- for ($i = 0; $i < strlen($number); $i++) {
- $firstDigit = intval($number[$i]);
- $multiply = $firstDigit * $digit + $residue;
- $product .= $multiply % 10;
- $residue = intval($multiply / 10);
- if ($i === (strlen($number) - 1) && $residue !== 0) {
- $product .= $residue;
- }
- }
- echo strrev($product);
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