Update avl_tree.md (#1524)

Syntax for avl trees updated
1 month ago · 0c60037e56
parent 5849ae4ada
commit 0c60037e56
1 changed files with 1 additions and 1 deletions
--- a/docs/chapter_tree/avl_tree.md
+++ b/docs/chapter_tree/avl_tree.md
@ -180,7 +180,7 @@ AVL 树既是二叉搜索树，也是平衡二叉树，同时满足这两类二
    ```c title=""
    /* AVL 树节点结构体 */
-    TreeNode struct TreeNode {
+    typedef struct TreeNode {
        int val;
        int height;
        struct TreeNode *left;