44 lines
1.4 KiB
PHP
44 lines
1.4 KiB
PHP
<?php
|
|
|
|
/**
|
|
* File: deque.php
|
|
* Created Time: 2024-05-19
|
|
* Author: DoWake (admin@mengxing.cc)
|
|
*/
|
|
|
|
/* Driver Code */
|
|
/* 初始化双向队列 */
|
|
// 使用SplDoublyLinkedList类实现双向队列
|
|
$deque = new SplDoublyLinkedList();
|
|
$deque->push(3);
|
|
$deque->push(2);
|
|
$deque->push(5);
|
|
echo '双向队列 deque = [' . join(', ', iterator_to_array($deque)) . ']' . PHP_EOL;
|
|
|
|
/* 访问元素 */
|
|
$peekFirst = $deque->bottom();
|
|
echo "队首元素 peekFirst = {$peekFirst}" . PHP_EOL;
|
|
$peekLast = $deque->top();
|
|
echo "队尾元素 peekLast = {$peekLast}" . PHP_EOL;
|
|
|
|
/* 元素入队 */
|
|
$deque->push(4);
|
|
echo '元素 4 队尾入队后 deque = [' . join(', ', iterator_to_array($deque)) . ']' . PHP_EOL;
|
|
$deque->unshift(1);
|
|
echo '元素 1 队首入队后 deque = [' . join(', ', iterator_to_array($deque)) . ']' . PHP_EOL;
|
|
|
|
/* 元素出队 */
|
|
$popLast = $deque->pop();
|
|
echo "队尾出队元素 = {$popLast}，队尾出队后 deque = [" . join(', ', iterator_to_array($deque)) . ']' . PHP_EOL;
|
|
$popFirst = $deque->shift();
|
|
echo "队首出队元素 = {$popFirst}，队首出队后 deque = [" . join(', ', iterator_to_array($deque)) . ']' . PHP_EOL;
|
|
|
|
/* 获取双向队列的长度 */
|
|
$size = $deque->count();
|
|
echo "双向队列长度 size = {$size}" . PHP_EOL;
|
|
|
|
/* 判断双向队列是否为空 */
|
|
$isEmpty = $deque->isEmpty();
|
|
$isEmptyStr = $isEmpty ? 'true' : 'false';
|
|
echo "双向队列是否为空 = {$isEmptyStr}" . PHP_EOL;
|