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<?php
declare(strict_types=1);
namespace leetcode;
class HammingDistance
{
public static function hammingDistance(int $x, int $y): int
if ($x === $y) {
return 0;
}
$z = (string)(decbin($x ^ $y));
return (int)(substr_count($z, '1'));
public static function hammingDistance2(int $x, int $y): int
[$n, $z] = [0, $x ^ $y];
while ($z) {
$z &= $z - 1;
$n++;
return $n;
imajinyun /
leetcode-php
