diff --git a/problems/0090.子集II.md b/problems/0090.子集II.md
index 5c19adc0..ae8f9928 100644
--- a/problems/0090.子集II.md
+++ b/problems/0090.子集II.md
@@ -48,7 +48,7 @@
 
 ## C++代码
 
-```
+```c++
 class Solution {
 private:
     vector<vector<int>> result;
@@ -80,11 +80,10 @@ public:
         return result;
     }
 };
-
 ```
 
 使用set去重的版本。
-```
+```c++
 class Solution {
 private:
     vector<vector<int>> result;
@@ -113,7 +112,6 @@ public:
         return result;
     }
 };
-
 ```
 
 ## 补充
@@ -151,7 +149,6 @@ public:
         return result;
     }
 };
-
 ```
 
 ## 总结