diff --git a/.vscode/settings.json b/.vscode/settings.json
index 86f533f..8846625 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -20,6 +20,27 @@
         "ios": "cpp",
         "istream": "cpp",
         "ostream": "cpp",
-        "xiosbase": "cpp"
+        "xiosbase": "cpp",
+        "cctype": "cpp",
+        "cmath": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "cwchar": "cpp",
+        "iostream": "cpp",
+        "iterator": "cpp",
+        "memory": "cpp",
+        "new": "cpp",
+        "stdexcept": "cpp",
+        "typeinfo": "cpp",
+        "xfacet": "cpp",
+        "xlocale": "cpp",
+        "xlocinfo": "cpp",
+        "xlocnum": "cpp",
+        "xmemory": "cpp",
+        "xmemory0": "cpp",
+        "xstddef": "cpp"
     }
 }
\ No newline at end of file
diff --git a/Algorithm/BucketSort.cpp b/Algorithm/BucketSort.cpp
index 8b3d36f..8ee2fd4 100644
--- a/Algorithm/BucketSort.cpp
+++ b/Algorithm/BucketSort.cpp
@@ -1,7 +1,7 @@
 #include<iterator>
 #include<iostream>
 #include<vector>
-using namespace std;
+using std::vector;
 
 /*****************
 
diff --git a/README.md b/README.md
index 5b106cc..014998c 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@
 
 ## C/C++
 
-### const
+<details><summary>const</summary><br>
 
 ```cpp
 // 类
@@ -84,6 +84,10 @@ int* const function7();     // 返回一个指向变量的常指针，使用：i
 3. 常量引用，经常用于形参类型，即避免了拷贝，又避免了函数对值的修改；
 4. 修饰成员函数，说明该成员函数内不能修改成员变量。
 
+
+</details>
+
+
 ### volatile
 
 ```cpp