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<?php
declare(strict_types=1);
namespace leetcode;
class PowerOfTwo
{
public static function isPowerOfTwo(int $n): bool
return $n > 0 && (($n & ($n - 1)) === 0);
}
public static function isPowerOfTwo2(int $n): bool
if ($n <= 0) {
return false;
while ($n % 2 === 0) {
$n /= 2;
return $n === 1;
public static function isPowerOfTwo3(int $n): bool
return $n > 0 && ($n === 1 || ($n % 2 === 0 && self::isPowerOfTwo3($n / 2)));
imajinyun /
leetcode-php
