build

docs/chapter_array_and_linkedlist/linked_list.md

@@ -875,9 +875,10 @@ comments: true
     ```c title="linked_list.c"
     /* 访问链表中索引为 index 的节点 */
     ListNode *access(ListNode *head, int index) {
-        while (head && head->next && index) {
+        for (int i = 0; i < index; i++) {
+            if (head == NULL)
+                return NULL;
             head = head->next;
-            index--;
         }
         return head;
     }