diff --git a/notes/26. 树的子结构.md b/notes/26. 树的子结构.md
index bce9fbf9..26e2229d 100644
--- a/notes/26. 树的子结构.md	
+++ b/notes/26. 树的子结构.md	
@@ -2,7 +2,7 @@
 
 ## 题目链接
 
-[牛客网](https://www.nowcoder.com/practice/6e196c44c7004d15b1610b9afca8bd88?tpId=13&tqId=11170&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking&from=cyc_github)
+[Leetcode](https://leetcode.cn/problems/shu-de-zi-jie-gou-lcof/)
 
 ## 题目描述
 
@@ -11,10 +11,10 @@
 ## 解题思路
 
 ```java
-public boolean HasSubtree(TreeNode root1, TreeNode root2) {
-    if (root1 == null || root2 == null)
+public boolean isSubStructure(TreeNode A, TreeNode B) {
+    if (A == null || B == null)
         return false;
-    return isSubtreeWithRoot(root1, root2) || HasSubtree(root1.left, root2) || HasSubtree(root1.right, root2);
+    return isSubtreeWithRoot(A, B) || isSubStructure(A.left, B) || isSubStructure(A.right, B);
 }
 
 private boolean isSubtreeWithRoot(TreeNode root1, TreeNode root2) {