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Update linked_list.md (#1521)

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双向链表的Dart代码可能存在语法错误，因为前驱节点和后继节点可能为空，所以需要添加问号，否则无法通过空安全检查
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ZhongGuanbin 2024-09-28 09:13:18 +08:00 committed by GitHub
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docs/chapter_array_and_linkedlist/linked_list.md
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@ -635,8 +635,8 @@
/* 双向链表节点类 */
class ListNode {
int val; // 节点值
ListNode next; // 指向后继节点的引用
ListNode prev; // 指向前驱节点的引用
ListNode? next; // 指向后继节点的引用
ListNode? prev; // 指向前驱节点的引用
ListNode(this.val, [this.next, this.prev]); // 构造函数
}
```