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<?php
declare(strict_types=1);
namespace leetcode;
class ImplementStackUsingQueues
{
private array $cache = [];
private array $queue = [];
public function push(int $value): void
$this->cache[] = $value;
while (count($this->queue)) {
$this->cache[] = array_shift($this->queue);
}
$tmp = $this->cache;
$this->cache = $this->queue;
$this->queue = $tmp;
public function pop(): ?int
if (empty($this->queue)) {
return null;
return array_shift($this->queue);
public function top(): ?int
return current($this->queue);
public function empty(): bool
return empty($this->queue) && empty($this->cache);
imajinyun /
leetcode-php
