diff --git a/notes/55.2 平衡二叉树.md b/notes/55.2 平衡二叉树.md
index 12c57f42..8327680a 100644
--- a/notes/55.2 平衡二叉树.md	
+++ b/notes/55.2 平衡二叉树.md	
@@ -1,6 +1,6 @@
 # 55.2 平衡二叉树
 
-[NowCoder](https://www.nowcoder.com/practice/8b3b95850edb4115918ecebdf1b4d222?tpId=13&tqId=11192&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
+[Leetcode](https://leetcode.cn/problems/ping-heng-er-cha-shu-lcof/)
 
 ## 题目描述
 
@@ -13,7 +13,8 @@
 ```java
 private boolean isBalanced = true;
 
-public boolean IsBalanced_Solution(TreeNode root) {
+public boolean isBalanced(TreeNode root) {
+    isBalanced = true;
     height(root);
     return isBalanced;
 }