diff --git a/data/tree.json b/data/tree.json
index ce32c266411bb0e91ab38682b11cf5ba1b5e3e69..fc7b25046ebe31943345426ff00b1b30cb681828 100644
--- a/data/tree.json
+++ b/data/tree.json
@@ -63,7 +63,8 @@
                       "keywords_must": [
                         "发展史"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -155,7 +156,8 @@
                         "特征",
                         "特性"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -237,7 +239,8 @@
                       "keywords_must": [
                         "标准"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -333,7 +336,8 @@
                       "keywords_must": [
                         "编程机制"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
@@ -341,7 +345,8 @@
                   "概述",
                   "概要"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 1
               }
             },
             {
@@ -363,7 +368,8 @@
                       "keywords_must": [
                         "变量"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -378,7 +384,8 @@
                         "常量",
                         "const"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -452,14 +459,16 @@
                       "keywords_must": [
                         "数据类型"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "数据类型"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 1
               }
             },
             {
@@ -486,7 +495,8 @@
                       "keywords_must": [
                         "赋值"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -575,7 +585,8 @@
                       "keywords_must": [
                         "算术"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -648,7 +659,8 @@
                       "keywords_must": [
                         "关系"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -715,7 +727,8 @@
                       "keywords_must": [
                         "逻辑"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -733,7 +746,8 @@
                       "keywords_must": [
                         "逗号"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -751,7 +765,8 @@
                       "keywords_must": [
                         "条件"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -767,7 +782,8 @@
                       "keywords_must": [
                         "sizeof"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -786,7 +802,8 @@
                         "优先级",
                         "求值顺序"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
@@ -794,7 +811,8 @@
                   "运算符",
                   "表达式"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 1
               }
             },
             {
@@ -821,7 +839,8 @@
                         "语句",
                         "程序块"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -904,7 +923,8 @@
                       "keywords_must": [
                         "判断"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -993,7 +1013,8 @@
                       "keywords_must": [
                         "循环"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
@@ -1001,12 +1022,14 @@
                   "语句",
                   "控制流"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 1
               }
             }
           ],
           "keywords_must": [],
-          "keywords_forbid": []
+          "keywords_forbid": [],
+          "group": 0
         }
       },
       {
@@ -1041,7 +1064,8 @@
                         "函数的定义",
                         "函数定义"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1058,7 +1082,8 @@
                         "函数的参数",
                         "函数参数"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1076,7 +1101,8 @@
                         "函数的返回",
                         "函数返回"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1093,7 +1119,8 @@
                         "函数的调用",
                         "函数调用"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1110,7 +1137,8 @@
                         "函数的递归",
                         "函数递归"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1126,7 +1154,8 @@
                         "局部变量",
                         "全局变量"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1140,7 +1169,8 @@
                       "keywords_must": [
                         "头文件"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1156,7 +1186,8 @@
                         "内部函数",
                         "外部函数"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
@@ -1164,7 +1195,8 @@
                   "函数",
                   "程序结构"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 1
               }
             },
             {
@@ -1189,7 +1221,8 @@
                         "介绍",
                         "概述"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1204,7 +1237,8 @@
                       "keywords_must": [
                         "一维"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1219,7 +1253,8 @@
                       "keywords_must": [
                         "二维"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1235,14 +1270,16 @@
                         "变长数组",
                         "VLA"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "数组"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 1
               }
             },
             {
@@ -1266,7 +1303,8 @@
                         "指针",
                         "地址"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1282,7 +1320,8 @@
                         "指针",
                         "函数参数"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1298,7 +1337,8 @@
                         "指针",
                         "数组"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1315,7 +1355,8 @@
                         "地址",
                         "指针"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1332,7 +1373,8 @@
                         "指针数组",
                         "指针的指针"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1349,14 +1391,16 @@
                         "指向函数的指针",
                         "函数指针"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "指针"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -1383,7 +1427,8 @@
                         "字符串输入",
                         "字符串输出"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1398,19 +1443,22 @@
                       "keywords_must": [
                         "字符串"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "字符串"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             }
           ],
           "keywords_must": [],
-          "keywords_forbid": []
+          "keywords_forbid": [],
+          "group": 0
         }
       },
       {
@@ -1439,7 +1487,8 @@
                         "简介",
                         "介绍"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1454,7 +1503,8 @@
                       "keywords_must": [
                         "结构体数组"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1469,7 +1519,8 @@
                       "keywords_must": [
                         "结构体指针"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1486,7 +1537,8 @@
                         "结构体",
                         "函数"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1503,14 +1555,16 @@
                         "链式结构",
                         "链表"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "结构体"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -1536,7 +1590,8 @@
                         "联合体",
                         "共同体"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1551,7 +1606,8 @@
                       "keywords_must": [
                         "枚举"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
@@ -1560,7 +1616,8 @@
                   "共同体",
                   "枚举类型"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -1585,7 +1642,8 @@
                         "位",
                         "字节"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1601,7 +1659,8 @@
                         "二进制",
                         "2进制"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1617,7 +1676,8 @@
                         "八进制",
                         "8进制"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1633,7 +1693,8 @@
                         "十六进制",
                         "16进制"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1649,7 +1710,8 @@
                         "位逻辑",
                         "位运算"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1665,7 +1727,8 @@
                         "对齐特性",
                         "_Alignof"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1679,7 +1742,8 @@
                       "keywords_must": [
                         "位字段"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
@@ -1687,7 +1751,8 @@
                   "位运算",
                   "位操作"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -1710,7 +1775,8 @@
                       "keywords_must": [
                         "宏定义"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1725,7 +1791,8 @@
                       "keywords_must": [],
                       "keywords_forbid": [
                         "#include"
-                      ]
+                      ],
+                      "group": 0
                     }
                   },
                   {
@@ -1740,7 +1807,8 @@
                       "keywords_must": [
                         "#undef"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1755,7 +1823,8 @@
                       "keywords_must": [
                         "条件编译"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1769,7 +1838,8 @@
                       "keywords_must": [
                         "内联函数"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
@@ -1777,7 +1847,8 @@
                   "预处理器",
                   "预编译器"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -1850,7 +1921,8 @@
                         "文件的基本操作",
                         "文件基本操作"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1866,14 +1938,16 @@
                         "文件的读写",
                         "文件读写"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "文件"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -1896,7 +1970,8 @@
                       "keywords_must": [
                         "存储类别"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1946,14 +2021,16 @@
                         "内存动态管理",
                         "动态内存"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "存储管理"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -1979,7 +2056,8 @@
                         "数学库",
                         "math.h"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -1996,7 +2074,8 @@
                         "通用工具库",
                         "stdlib.h"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   },
                   {
@@ -2013,14 +2092,16 @@
                         "断言库",
                         "assert.h"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [
                   "标准函数库"
                 ],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             },
             {
@@ -2038,21 +2119,25 @@
                       "keywords_must": [
                         "C语言问答"
                       ],
-                      "keywords_forbid": []
+                      "keywords_forbid": [],
+                      "group": 0
                     }
                   }
                 ],
                 "keywords_must": [],
-                "keywords_forbid": []
+                "keywords_forbid": [],
+                "group": 2
               }
             }
           ],
           "keywords_must": [],
-          "keywords_forbid": []
+          "keywords_forbid": [],
+          "group": 0
         }
       }
     ],
     "keywords_must": [],
-    "keywords_forbid": []
+    "keywords_forbid": [],
+    "group": 0
   }
 }
\ No newline at end of file