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<?php
declare(strict_types=1);
namespace leetcode;
class ImplementQueueUsingStacks2
{
private array $cache;
private array $stack;
public function push(int $value): void
$this->cache[] = $value;
}
public function pop(): ?int
$this->peek();
return array_shift($this->stack);
public function peek(): ?int
if (empty($this->stack)) {
while (!empty($this->cache)) {
$this->stack[] = array_shift($this->cache);
return null;
return current($this->stack);
public function empty(): bool
return empty($this->stack) && empty($this->cache);
imajinyun /
leetcode-php
