diff --git a/problems/二叉树中递归带着回溯.md b/problems/二叉树中递归带着回溯.md
index 372a4660..27ed7a6f 100644
--- a/problems/二叉树中递归带着回溯.md
+++ b/problems/二叉树中递归带着回溯.md
@@ -90,8 +90,7 @@ public:
 
 
 如下为精简之后的递归代码：(257. 二叉树的所有路径)
-CPP
-```
+```CPP
 class Solution {
 private:
     void traversal(TreeNode* cur, string path, vector<string>& result) {
@@ -132,8 +131,7 @@ traversal(cur->left, path, result); // 左
 
 即：
 
-```
-
+``` CPP
 if (cur->left) {
     path += "->";
     traversal(cur->left, path, result); // 左