diff --git "a/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/3.C\350\257\255\350\250\200\346\240\207\345\207\206/standard.json" "b/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/3.C\350\257\255\350\250\200\346\240\207\345\207\206/standard.json"
index ead7335810823e5499cefe663b97bb3f4c35ac4b..f12d2325829c34344dba8a94b44fcbb645a30103 100644
--- "a/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/3.C\350\257\255\350\250\200\346\240\207\345\207\206/standard.json"
+++ "b/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/3.C\350\257\255\350\250\200\346\240\207\345\207\206/standard.json"
@@ -1,5 +1,6 @@
 {
-    "type": "code_options",
-    "author": "幻灰龙",
-    "source": "standard.md"
+  "type": "code_options",
+  "author": "幻灰龙",
+  "source": "standard.md",
+  "exercise_id": "8150ef23aad248f78110f33e34754311"
 }
\ No newline at end of file
diff --git "a/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/4.\347\274\226\347\250\213\346\234\272\345\210\266/compiler.json" "b/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/4.\347\274\226\347\250\213\346\234\272\345\210\266/compiler.json"
index bfc50d729d8e5f9994ea7cf858a152f7cb2a0289..bde35cabb8af7db8305fbbd3d79f22a69311ea96 100644
--- "a/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/4.\347\274\226\347\250\213\346\234\272\345\210\266/compiler.json"
+++ "b/data/1.C\350\257\255\350\250\200\345\210\235\351\230\266/1.C\350\257\255\350\250\200\346\246\202\350\277\260/4.\347\274\226\347\250\213\346\234\272\345\210\266/compiler.json"
@@ -1,5 +1,6 @@
 {
-    "type": "code_options",
-    "author": "幻灰龙",
-    "source": "compiler.md"
+  "type": "code_options",
+  "author": "幻灰龙",
+  "source": "compiler.md",
+  "exercise_id": "b812499b338541d2955575e56c116da9"
 }
\ No newline at end of file
diff --git "a/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/3.\346\214\207\351\222\210/config.json" "b/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/3.\346\214\207\351\222\210/config.json"
index d5b476fe4a453b41dbe4fb612bcbd6dee3bf439c..6a0d2594f961e9ab167471de3636a063c9e43a3b 100644
--- "a/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/3.\346\214\207\351\222\210/config.json"
+++ "b/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/3.\346\214\207\351\222\210/config.json"
@@ -5,7 +5,5 @@
     "C语言"
   ],
   "children": [],
-  "export": [
-    "vla.json"
-  ]
+  "export": []
 }
\ No newline at end of file
diff --git "a/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/4.\345\255\227\347\254\246\344\270\262/config.json" "b/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/4.\345\255\227\347\254\246\344\270\262/config.json"
index 93de8f058d363a4030e0f9136d54454f787e574b..f25810fdc080181491288aff93c19e3c1a9e3461 100644
--- "a/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/4.\345\255\227\347\254\246\344\270\262/config.json"
+++ "b/data/2.C\350\257\255\350\250\200\344\270\255\351\230\266/4.\345\255\227\347\254\246\344\270\262/config.json"
@@ -5,7 +5,5 @@
     "C语言"
   ],
   "children": [],
-  "export": [
-    "pointers_2_func.json"
-  ]
+  "export": []
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/2.\350\201\224\345\220\210\344\275\223\344\270\216\346\236\232\344\270\276\347\261\273\345\236\213/config.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/2.\350\201\224\345\220\210\344\275\223\344\270\216\346\236\232\344\270\276\347\261\273\345\236\213/config.json"
index 9ac053257d330aa8a370ea97fb2609bc033ae061..7db018ccc42be126ad1cc02846c9b0240e85e776 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/2.\350\201\224\345\220\210\344\275\223\344\270\216\346\236\232\344\270\276\347\261\273\345\236\213/config.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/2.\350\201\224\345\220\210\344\275\223\344\270\216\346\236\232\344\270\276\347\261\273\345\236\213/config.json"
@@ -7,7 +7,5 @@
     "C语言"
   ],
   "children": [],
-  "export": [
-    "linked_list.json"
-  ]
+  "export": []
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/4.\345\215\201\345\205\255\350\277\233\345\210\266/bin_to_hex.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/4.\345\215\201\345\205\255\350\277\233\345\210\266/bin_to_hex.json"
index a6ff0f5ef96d75f15184a0ca5a4240fb736ef44a..ae71d5b594a8ec9ff61aa66376b44ecf7ec8636a 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/4.\345\215\201\345\205\255\350\277\233\345\210\266/bin_to_hex.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/4.\345\215\201\345\205\255\350\277\233\345\210\266/bin_to_hex.json"
@@ -1,5 +1,6 @@
 {
-    "type": "code_options",
-    "author": "幻灰龙",
-    "source": "bin_to_hex.md"
+  "type": "code_options",
+  "author": "幻灰龙",
+  "source": "bin_to_hex.md",
+  "exercise_id": "bfae271b73284a6fa5f48bcde4a7f3e0"
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/5.\344\275\215\351\200\273\350\276\221\350\277\220\347\256\227\347\254\246/bit_op.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/5.\344\275\215\351\200\273\350\276\221\350\277\220\347\256\227\347\254\246/bit_op.json"
index 24fad563ea3280d3f6c59aea1869656ba8f4fcff..2257062e97bcc662e7983ed5ed6d78c678a33722 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/5.\344\275\215\351\200\273\350\276\221\350\277\220\347\256\227\347\254\246/bit_op.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/5.\344\275\215\351\200\273\350\276\221\350\277\220\347\256\227\347\254\246/bit_op.json"
@@ -1,5 +1,6 @@
 {
-    "type": "code_options",
-    "author": "幻灰龙",
-    "source": "bit_op.md"
+  "type": "code_options",
+  "author": "幻灰龙",
+  "source": "bit_op.md",
+  "exercise_id": "0952044cc5e54770b7418ed868d201a2"
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack01.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack01.json"
index c14c57a35ba0301928c4c9f6dae4d341e28aa13d..c74f0b2d0d63ad07ba044b8bcd8eda0facec842e 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack01.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack01.json"
@@ -1,5 +1,6 @@
 {
-    "type": "code_options",
-    "author": "幻灰龙",
-    "source": "pack01.md"
+  "type": "code_options",
+  "author": "幻灰龙",
+  "source": "pack01.md",
+  "exercise_id": "4aa8ae84487d433e943a5a9ef6293dbd"
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack02.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack02.json"
index e603144246e8c9a7a57f9b80c667c07e778e31f1..184baf92fe20ea9f4ad9adcc7d5940a62619dec7 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack02.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/6.\345\257\271\351\275\220\347\211\271\346\200\247/pack02.json"
@@ -1,5 +1,6 @@
 {
-    "type": "code_options",
-    "author": "幻灰龙",
-    "source": "pack02.md"
+  "type": "code_options",
+  "author": "幻灰龙",
+  "source": "pack02.md",
+  "exercise_id": "03f964d865b54fe9947e728585a27486"
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/config.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/config.json"
index 6a94f8a5b527b8040f0cb78bfff54cb31dc37638..664a17d1f54749516888ec65ff585b4dbe626736 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/config.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/3.\344\275\215\350\277\220\347\256\227/config.json"
@@ -6,7 +6,5 @@
     "C语言"
   ],
   "children": [],
-  "export": [
-    "enum.json"
-  ]
+  "export": []
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/config.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/config.json"
index c1c4a8374f52f21419801a252ef55cb6c1df68c5..affe31eb593d1b823e5ae5748e252d820d119335 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/config.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/5.\346\226\207\344\273\266/config.json"
@@ -5,7 +5,5 @@
     "C语言"
   ],
   "children": [],
-  "export": [
-    "inline01.json"
-  ]
+  "export": []
 }
\ No newline at end of file
diff --git "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/6.\345\255\230\345\202\250\347\256\241\347\220\206/config.json" "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/6.\345\255\230\345\202\250\347\256\241\347\220\206/config.json"
index adbc462be144f0248201189a8c7e1fffef2307e5..d768b6584935c569313d237db59f50ca2703699a 100644
--- "a/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/6.\345\255\230\345\202\250\347\256\241\347\220\206/config.json"
+++ "b/data/3.C\350\257\255\350\250\200\351\253\230\351\230\266/6.\345\255\230\345\202\250\347\256\241\347\220\206/config.json"
@@ -6,7 +6,5 @@
     "C语言"
   ],
   "children": [],
-  "export": [
-    "file_hash.json"
-  ]
+  "export": []
 }
\ No newline at end of file
diff --git a/data/tree.json b/data/tree.json
index e15919e5fd024292466d14810cfa4c89e59cbf3b..dd957cb75f327291721aff57db091c93756d12f2 100644
--- a/data/tree.json
+++ b/data/tree.json
@@ -5,20 +5,24 @@
     "children": [
       {
         "C语言初阶": {
-          "node_id": "8699564e59bd4972a2aae85e7e198c4d",
+          "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
           "keywords": [],
           "children": [
             {
               "C语言概述": {
                 "node_id": "ff93d18873424490849cdcf2ca01a48b",
-                "keywords": [],
+                "keywords": [
+                  "概述",
+                  "C语言概述",
+                  "C语言"
+                ],
                 "children": [
                   {
                     "C语言发展史": {
                       "node_id": "8c3cdf9ae7b547adbd99c360246bf2b2",
                       "keywords": [
-                        "C语言概述",
-                        "概述",
+                        "C语言发展史",
+                        "发展史",
                         "C语言"
                       ],
                       "children": [
@@ -226,7 +230,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "d8484b58a8724720bc603c7f4502c663"
+                            "node_id": "557cbf68f22a4747b8992615ad643fa8"
                           }
                         },
                         {
@@ -237,7 +241,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "5df2b51772a347d0af0e58a58fe2dddb"
+                            "node_id": "33b51bd99ba743c090b8050e3e784470"
                           }
                         },
                         {
@@ -247,7 +251,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "820683ecd76749c4bdd1cf67c1a638d2"
+                            "node_id": "d78d438e88454d1fa7dd12676b100e0c"
                           }
                         },
                         {
@@ -258,7 +262,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "c3dba269f7234c259fd5a86cb32fe14e"
+                            "node_id": "be25cc23301b4373940b6eff8291bb05"
                           }
                         },
                         {
@@ -268,7 +272,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "a2e960e51c174ada94e889beb01b89c1"
+                            "node_id": "a9c21fb270414f5d8599b1eea5e6a59f"
                           }
                         },
                         {
@@ -281,7 +285,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "bb2a19fec37745c4bad917d57da0a9cd"
+                            "node_id": "4b692f5904ff4c70a44a648f47c024d4"
                           }
                         },
                         {
@@ -292,7 +296,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "9bd2fc9f48be469bb057b46f99f0b9e3"
+                            "node_id": "68819aeb078d4ce4a6538b8a548c0eea"
                           }
                         },
                         {
@@ -303,7 +307,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "ac1afe2e796b45e4b191db769245c33a"
+                            "node_id": "908f40d645f4410680fbab6feddab8b2"
                           }
                         }
                       ]
@@ -316,7 +320,7 @@
               "数据类型": {
                 "node_id": "c7ef387bd4bf4bd0a87d1886e66160c5",
                 "keywords": [
-                  "编程机制",
+                  "数据类型",
                   "C语言"
                 ],
                 "children": [
@@ -355,7 +359,7 @@
                               "int"
                             ],
                             "children": [],
-                            "node_id": "714e6165568248aeb284356eeb0821c0"
+                            "node_id": "4b8c956c12dd4d59a3ebdab97bac590d"
                           }
                         },
                         {
@@ -366,7 +370,7 @@
                               "double"
                             ],
                             "children": [],
-                            "node_id": "bc91e7bffb97458bb9d5143c52b8b84c"
+                            "node_id": "50a4fd5c83bf4f558d7cc9cc27c39c90"
                           }
                         },
                         {
@@ -376,7 +380,7 @@
                               "char"
                             ],
                             "children": [],
-                            "node_id": "3caf78e68a2a4cb38db14f8d2aeb8864"
+                            "node_id": "8cff086ba20b4cc88f07dbb3dc8e7c38"
                           }
                         },
                         {
@@ -386,7 +390,7 @@
                               "boll"
                             ],
                             "children": [],
-                            "node_id": "6d00d6533afd4f8eb0b7974315888381"
+                            "node_id": "1702c0269b714bf3a5b00e366a71a829"
                           }
                         }
                       ]
@@ -399,8 +403,9 @@
               "运算符与表达式": {
                 "node_id": "5002624ecc8d4be1a3d8eab4579ac7b8",
                 "keywords": [
-                  "基本数据类型",
-                  "数据类型"
+                  "运算符",
+                  "表达式",
+                  "运算符与表达式"
                 ],
                 "children": [
                   {
@@ -409,7 +414,9 @@
                       "keywords": [
                         "赋值",
                         "运算符",
+                        "表达式",
                         "赋值运算符",
+                        "赋值表达式",
                         "C语言"
                       ],
                       "children": []
@@ -421,7 +428,9 @@
                       "keywords": [
                         "算术",
                         "算术运算符",
+                        "算术表达式",
                         "运算符",
+                        "表达式",
                         "C语言"
                       ],
                       "children": [
@@ -504,7 +513,9 @@
                       "keywords": [
                         "关系",
                         "关系运算符",
+                        "关系表达式",
                         "运算符",
+                        "表达式",
                         "C语言"
                       ],
                       "children": [
@@ -577,6 +588,8 @@
                       "keywords": [
                         "逻辑",
                         "逻辑运算符",
+                        "逻辑表达式",
+                        "表达式",
                         "运算符",
                         "C语言"
                       ],
@@ -621,7 +634,11 @@
                     "逗号运算符与表达式": {
                       "node_id": "d8047c9c975b457cbc30445ff78787d6",
                       "keywords": [
+                        "逗号",
                         "运算符",
+                        "表达式",
+                        "逗号运算符",
+                        "逗号表达式",
                         "C语言"
                       ],
                       "children": []
@@ -633,6 +650,8 @@
                       "keywords": [
                         "条件",
                         "条件运算符",
+                        "条件表达式",
+                        "表达式",
                         "运算符",
                         "C语言"
                       ],
@@ -643,6 +662,8 @@
                     "sizeof运算符": {
                       "node_id": "a78c62afc42f45178a799ff67c9fd330",
                       "keywords": [
+                        "sizeof运算符",
+                        "sizeof",
                         "运算符",
                         "C语言"
                       ],
@@ -654,6 +675,10 @@
                       "node_id": "eb5b902755f24674bce31bde2ce4f439",
                       "keywords": [
                         "运算符",
+                        "优先级",
+                        "求值顺序",
+                        "运算符优先级",
+                        "运算符求值顺序",
                         "C语言"
                       ],
                       "children": []
@@ -666,7 +691,9 @@
               "语句与控制流": {
                 "node_id": "18bef4edbf9a498fa3838246cd733986",
                 "keywords": [
-                  "运算符",
+                  "语句与控制流",
+                  "语句",
+                  "控制流",
                   "C语言"
                 ],
                 "children": [
@@ -675,7 +702,8 @@
                       "node_id": "a88a08b3d3a24780b94e2809336202b5",
                       "keywords": [
                         "语句",
-                        "控制流",
+                        "程序块",
+                        "语句与程序块",
                         "C语言"
                       ],
                       "children": []
@@ -685,8 +713,9 @@
                     "判断语句": {
                       "node_id": "0c86f68dfe7c4a4ca6c8b7c12135fd43",
                       "keywords": [
+                        "判断语句",
+                        "判断",
                         "语句",
-                        "控制流",
                         "C语言"
                       ],
                       "children": [
@@ -746,7 +775,8 @@
                       "node_id": "bc001e483b8c41a8a7ccc369393d636a",
                       "keywords": [
                         "语句",
-                        "控制流",
+                        "循环",
+                        "循环语句",
                         "C语言"
                       ],
                       "children": [
@@ -826,20 +856,27 @@
       },
       {
         "C语言中阶": {
-          "node_id": "a311b31b4bda403f99963cffd92e6306",
+          "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
           "keywords": [],
           "children": [
             {
               "函数与程序结构": {
                 "node_id": "c1d5e45aeba9407a9aba96de5af95e4e",
-                "keywords": [],
+                "keywords": [
+                  "函数",
+                  "程序结构",
+                  "C语言"
+                ],
                 "children": [
                   {
                     "函数的声明与定义": {
                       "node_id": "e2785c48975d4b32917e89a5c260ae27",
                       "keywords": [
                         "函数",
-                        "程序结构",
+                        "声明",
+                        "定义",
+                        "函数声明",
+                        "函数定义",
                         "C语言"
                       ],
                       "children": []
@@ -850,7 +887,8 @@
                       "node_id": "30a5dee1088c403b81ae2d61f717f214",
                       "keywords": [
                         "函数",
-                        "程序结构",
+                        "参数",
+                        "函数参数",
                         "C语言"
                       ],
                       "children": []
@@ -861,7 +899,9 @@
                       "node_id": "bfff88a1a24e4eb98577ac663c44da09",
                       "keywords": [
                         "函数",
-                        "程序结构",
+                        "返回",
+                        "返回值",
+                        "函数返回",
                         "C语言"
                       ],
                       "children": []
@@ -872,7 +912,8 @@
                       "node_id": "67a79ded33aa459e81f953aea62b5b65",
                       "keywords": [
                         "函数",
-                        "程序结构",
+                        "调用",
+                        "函数调用",
                         "C语言"
                       ],
                       "children": []
@@ -883,7 +924,8 @@
                       "node_id": "978a26e7ad464c5481ce0c56480ed60d",
                       "keywords": [
                         "函数",
-                        "程序结构",
+                        "递归",
+                        "函数递归",
                         "C语言"
                       ],
                       "children": []
@@ -893,8 +935,8 @@
                     "局部变量和全局变量": {
                       "node_id": "293ce0005b924bd7b76216d395e021f2",
                       "keywords": [
-                        "C语言概述",
-                        "概述",
+                        "局部变量",
+                        "全局变量",
                         "C语言"
                       ],
                       "children": []
@@ -904,8 +946,7 @@
                     "头文件": {
                       "node_id": "9b668f9078814a86b5d45265f2d87186",
                       "keywords": [
-                        "函数",
-                        "程序结构",
+                        "头文件",
                         "C语言"
                       ],
                       "children": []
@@ -915,8 +956,8 @@
                     "内部函数和外部函数": {
                       "node_id": "c4862064e784410fb4ee6f54e2c74e7a",
                       "keywords": [
-                        "函数",
-                        "程序结构",
+                        "内部函数",
+                        "外部函数",
                         "C语言"
                       ],
                       "children": []
@@ -929,8 +970,7 @@
               "数组": {
                 "node_id": "aab5230436134bc0ae4334f20616646b",
                 "keywords": [
-                  "函数",
-                  "程序结构",
+                  "数组",
                   "C语言"
                 ],
                 "children": [
@@ -938,6 +978,7 @@
                     "数组简介": {
                       "node_id": "4103c3071b694c778cdee1f78150b3dd",
                       "keywords": [
+                        "数组简介",
                         "数组",
                         "C语言"
                       ],
@@ -948,6 +989,7 @@
                     "一维数组": {
                       "node_id": "50bb5756ca6f4fab9db632226f95ef13",
                       "keywords": [
+                        "一维数组",
                         "数组",
                         "C语言"
                       ],
@@ -959,6 +1001,7 @@
                       "node_id": "f9e454c8bac54e17a358aa3537f80f2b",
                       "keywords": [
                         "数组",
+                        "二维数组",
                         "C语言"
                       ],
                       "children": []
@@ -969,6 +1012,7 @@
                       "node_id": "ba9bbb9164584d7285e469c5aa34b8aa",
                       "keywords": [
                         "数组",
+                        "变长数组",
                         "C语言"
                       ],
                       "children": []
@@ -981,7 +1025,7 @@
               "指针": {
                 "node_id": "9e7cea0fd7294892be114dbb7fbc9b30",
                 "keywords": [
-                  "数组",
+                  "指针",
                   "C语言"
                 ],
                 "children": [
@@ -989,6 +1033,7 @@
                     "指针与地址": {
                       "node_id": "b56d0beb05d8468a92b5127af497f66b",
                       "keywords": [
+                        "地址",
                         "指针",
                         "C语言"
                       ],
@@ -999,6 +1044,7 @@
                     "指针与函数参数": {
                       "node_id": "c125ac53cc324775abe8604efe6ba023",
                       "keywords": [
+                        "函数参数",
                         "指针",
                         "C语言"
                       ],
@@ -1009,6 +1055,7 @@
                     "指针与数组": {
                       "node_id": "826682a938a0422390dcf4d3f7b933b4",
                       "keywords": [
+                        "数组",
                         "指针",
                         "C语言"
                       ],
@@ -1019,6 +1066,8 @@
                     "地址算术运算": {
                       "node_id": "2301f0c532c143c28e3261b442743f05",
                       "keywords": [
+                        "地址算术运算",
+                        "算术运算",
                         "指针",
                         "C语言"
                       ],
@@ -1029,6 +1078,8 @@
                     "指针数组以及指向指针的指针": {
                       "node_id": "86987ec92a6b441abc05a9dc616e3075",
                       "keywords": [
+                        "指针数组",
+                        "指针的指针",
                         "指针",
                         "C语言"
                       ],
@@ -1040,6 +1091,8 @@
                       "node_id": "fa927c0947f3427aafee3415e11694e7",
                       "keywords": [
                         "指针",
+                        "函数指针",
+                        "指向函数的指针",
                         "C语言"
                       ],
                       "children": []
@@ -1052,7 +1105,7 @@
               "字符串": {
                 "node_id": "60997c5d19b84545abb2adbac24351bc",
                 "keywords": [
-                  "指针",
+                  "字符串",
                   "C语言"
                 ],
                 "children": [
@@ -1060,8 +1113,11 @@
                     "字符串输入与输出": {
                       "node_id": "bbd1310e647846018a1ff37d29c70ff0",
                       "keywords": [
-                        "C语言概述",
-                        "概述",
+                        "字符串输出",
+                        "字符串输入",
+                        "输出",
+                        "输入",
+                        "字符串",
                         "C语言"
                       ],
                       "children": []
@@ -1071,8 +1127,8 @@
                     "字符串函数": {
                       "node_id": "2aa6707a4e0244dfab606b030f5c35c9",
                       "keywords": [
-                        "C语言概述",
-                        "概述",
+                        "字符串函数",
+                        "字符串",
                         "C语言"
                       ],
                       "children": []
@@ -1086,18 +1142,22 @@
       },
       {
         "C语言高阶": {
-          "node_id": "307890a9cb4543b08f52b4b0a7fe9933",
+          "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
           "keywords": [],
           "children": [
             {
               "结构体": {
                 "node_id": "457fbccd00ef4ce3b0f44702f9755b43",
-                "keywords": [],
+                "keywords": [
+                  "结构体",
+                  "C语言"
+                ],
                 "children": [
                   {
                     "结构体简介": {
                       "node_id": "86b95a1e3e084e7c92fa959b731d81dc",
                       "keywords": [
+                        "结构体简介",
                         "结构体",
                         "C语言"
                       ],
@@ -1108,6 +1168,7 @@
                     "结构体数组": {
                       "node_id": "e970a52419484d11bcdd097d713b065e",
                       "keywords": [
+                        "结构体数组",
                         "结构体",
                         "C语言"
                       ],
@@ -1118,6 +1179,7 @@
                     "结构体指针": {
                       "node_id": "c41c3c9229594a619abb2295be13a789",
                       "keywords": [
+                        "结构体指针",
                         "结构体",
                         "C语言"
                       ],
@@ -1128,6 +1190,8 @@
                     "结构体与函数": {
                       "node_id": "11a69657ca7d422d9a08ecef807f1600",
                       "keywords": [
+                        "结构体与函数",
+                        "函数",
                         "结构体",
                         "C语言"
                       ],
@@ -1138,6 +1202,8 @@
                     "链式结构": {
                       "node_id": "a6978054585b44acb482eea3d9e4aefc",
                       "keywords": [
+                        "链式结构",
+                        "链表",
                         "结构体",
                         "C语言"
                       ],
@@ -1151,7 +1217,9 @@
               "联合体与枚举类型": {
                 "node_id": "6a54244141664f8a9fe626d564bb150f",
                 "keywords": [
-                  "结构体",
+                  "枚举类型",
+                  "联合体",
+                  "共用体",
                   "C语言"
                 ],
                 "children": [
@@ -1160,7 +1228,8 @@
                       "node_id": "65fbcb8587ab432895bbfb7d873d17de",
                       "keywords": [
                         "联合体",
-                        "共用体"
+                        "共用体",
+                        "C语言"
                       ],
                       "children": []
                     }
@@ -1170,7 +1239,8 @@
                       "node_id": "a18e6c6aef644580a7e9743087cb8fd8",
                       "keywords": [
                         "枚举",
-                        "枚举类型"
+                        "枚举类型",
+                        "C语言"
                       ],
                       "children": []
                     }
@@ -1182,27 +1252,28 @@
               "位运算": {
                 "node_id": "f0296e72f7c441f0b0eee5a854580022",
                 "keywords": [
-                  "枚举",
-                  "枚举类型"
+                  "位运算",
+                  "位操作",
+                  "C语言"
                 ],
                 "children": [
                   {
                     "位和字节": {
                       "node_id": "cfe3277172e24a0587fc7b9dca6b8633",
                       "keywords": [
-                        "位运算",
-                        "位操作",
+                        "位和字节",
+                        "字节",
                         "C语言"
                       ],
                       "children": []
                     }
                   },
                   {
-                    "二进制数": {
+                    "二进制": {
                       "node_id": "18a259dd149a4ad4b51ca76cece73575",
                       "keywords": [
-                        "位运算",
-                        "位操作",
+                        "二进制",
+                        "2进制",
                         "C语言"
                       ],
                       "children": []
@@ -1212,8 +1283,8 @@
                     "八进制": {
                       "node_id": "d09ce6bde4bd4d43b5bda77b98328367",
                       "keywords": [
-                        "位运算",
-                        "位操作",
+                        "八进制",
+                        "8进制",
                         "C语言"
                       ],
                       "children": []
@@ -1223,8 +1294,8 @@
                     "十六进制": {
                       "node_id": "2caff3956d7e43c08c46cdcf8f8b6f29",
                       "keywords": [
-                        "位运算",
-                        "位操作",
+                        "十六进制",
+                        "16进制",
                         "C语言"
                       ],
                       "children": []
@@ -1235,29 +1306,28 @@
                       "node_id": "d199fcbcb452465696fadddafbfb26e1",
                       "keywords": [
                         "位运算",
-                        "位操作",
+                        "位逻辑运算",
                         "C语言"
                       ],
                       "children": []
                     }
                   },
                   {
-                    "位字段": {
-                      "node_id": "044247ccf6324f749dd6fcecb6fd7c1f",
+                    "对齐特性": {
+                      "node_id": "501dc3e5d4da44fe8ba5614875d9cbdf",
                       "keywords": [
+                        "对齐特性",
                         "位运算",
-                        "位操作",
                         "C语言"
                       ],
                       "children": []
                     }
                   },
                   {
-                    "对齐特性": {
-                      "node_id": "501dc3e5d4da44fe8ba5614875d9cbdf",
+                    "位字段": {
+                      "node_id": "044247ccf6324f749dd6fcecb6fd7c1f",
                       "keywords": [
-                        "位运算",
-                        "位操作",
+                        "位字段",
                         "C语言"
                       ],
                       "children": []
@@ -1270,8 +1340,8 @@
               "预处理器": {
                 "node_id": "4c711f0dc45c49e39f2dbdb5f89008a9",
                 "keywords": [
-                  "位运算",
-                  "位操作",
+                  "预处理器",
+                  "预编译器",
                   "C语言"
                 ],
                 "children": [
@@ -1279,8 +1349,7 @@
                     "宏定义": {
                       "node_id": "81ca2e0059a547db93cb10c8352a3687",
                       "keywords": [
-                        "预处理器",
-                        "预编译器",
+                        "宏定义",
                         "C语言"
                       ],
                       "children": []
@@ -1290,8 +1359,8 @@
                     "#include指令": {
                       "node_id": "a9536f1fcd9242fc96a358be560ff7b1",
                       "keywords": [
-                        "预处理器",
-                        "预编译器",
+                        "include",
+                        "#include",
                         "C语言"
                       ],
                       "children": []
@@ -1301,8 +1370,8 @@
                     "#undef指令": {
                       "node_id": "9177a200808c4d879116a4a69e89df41",
                       "keywords": [
-                        "预处理器",
-                        "预编译器",
+                        "undef",
+                        "#undef",
                         "C语言"
                       ],
                       "children": []
@@ -1312,7 +1381,7 @@
                     "条件编译": {
                       "node_id": "d962e7c6c96d431ea38e6e6aed7728b6",
                       "keywords": [
-                        "预处理器",
+                        "条件编译",
                         "预编译器",
                         "C语言"
                       ],
@@ -1323,8 +1392,7 @@
                     "内联函数": {
                       "node_id": "d21d6de040954559abee2dbad03ac4d1",
                       "keywords": [
-                        "预处理器",
-                        "预编译器",
+                        "内联函数",
                         "C语言"
                       ],
                       "children": []
@@ -1337,8 +1405,7 @@
               "文件": {
                 "node_id": "4877d759ed524ba086a8dd6bc00c2e86",
                 "keywords": [
-                  "预处理器",
-                  "预编译器",
+                  "文件",
                   "C语言"
                 ],
                 "children": [
@@ -1347,6 +1414,7 @@
                       "node_id": "6ac7da2c6a894cc2ad4a2facb2aec07a",
                       "keywords": [
                         "文件",
+                        "文件基本操作",
                         "C语言"
                       ],
                       "children": [
@@ -1390,6 +1458,7 @@
                       "node_id": "c9f455f9665042b5bdfd19918e34cc94",
                       "keywords": [
                         "文件",
+                        "文件读写",
                         "C语言"
                       ],
                       "children": []
@@ -1402,7 +1471,8 @@
               "存储管理": {
                 "node_id": "d127f044a075402788e20b3cb690a328",
                 "keywords": [
-                  "文件",
+                  "存储管理",
+                  "内存管理",
                   "C语言"
                 ],
                 "children": [
@@ -1410,22 +1480,44 @@
                     "存储类别": {
                       "node_id": "055d9ba0f2864f78a5fea826aded5aaa",
                       "keywords": [
-                        "存储管理",
-                        "内存管理",
+                        "存储类别",
                         "C语言"
                       ],
                       "children": []
                     }
                   },
                   {
-                    "分配内存：malloc()和free()": {
+                    "内存动态管理": {
                       "node_id": "e75bdc3470954cb38bdfcf4f0ed3680b",
                       "keywords": [
                         "存储管理",
                         "内存管理",
+                        "内存动态管理",
                         "C语言"
                       ],
-                      "children": []
+                      "children": [
+                        {
+                          "内存分配：malloc()": {
+                            "keywords": [
+                              "内存分配",
+                              "malloc",
+                              "C语言"
+                            ],
+                            "children": [],
+                            "node_id": "db508a67e5fa4092ae5f130e59e15941"
+                          }
+                        },
+                        {
+                          "内存释放：free()": {
+                            "keywords": [
+                              "内存释放",
+                              "free",
+                              "C语言"
+                            ],
+                            "children": []
+                          }
+                        }
+                      ]
                     }
                   }
                 ]
@@ -1435,8 +1527,8 @@
               "标准函数库": {
                 "node_id": "a95ae0dfca614dab8b02ef4b96d7398d",
                 "keywords": [
-                  "存储管理",
-                  "内存管理",
+                  "标准函数库",
+                  "标准库",
                   "C语言"
                 ],
                 "children": [
@@ -1444,7 +1536,8 @@
                     "数学库": {
                       "node_id": "77363abd916c4981b595f44138f53e0a",
                       "keywords": [
-                        "标准函数库",
+                        "数学库",
+                        "math.h",
                         "标准库",
                         "C语言"
                       ],
@@ -1455,7 +1548,8 @@
                     "通用工具库": {
                       "node_id": "dab1add961df46479031b66bc52a00b0",
                       "keywords": [
-                        "标准函数库",
+                        "stdlib.h",
+                        "通用工具库",
                         "标准库",
                         "C语言"
                       ],
@@ -1463,10 +1557,11 @@
                     }
                   },
                   {
-                    "断言库 ": {
+                    "断言库": {
                       "node_id": "2ce0d5349c454d099692a07c2a32a56d",
                       "keywords": [
-                        "标准函数库",
+                        "assert.h",
+                        "断言库",
                         "标准库",
                         "C语言"
                       ],
diff --git a/src/tree.py b/src/tree.py
index 0ee49b762b946eeab9f98fa220a5503a73fcf01d..91c26528a456fdb7761940b505bf784fb5cc893f 100644
--- a/src/tree.py
+++ b/src/tree.py
@@ -37,6 +37,19 @@ def parse_no_name(d):
 
     return no, dir_name
 
+def check_export(base, cfg):
+    flag = False
+    exports = []
+    for export in cfg.get('export', []):
+        ecfg_path = os.path.join(base, export)
+        if os.path.exists(ecfg_path):
+            exports.append(export)
+        else:
+            flag = True
+    if flag:
+        cfg["export"] = exports
+    return flag
+
 
 def gen_tree(data_path):
     root = {}
@@ -54,18 +67,21 @@ def gen_tree(data_path):
                 yield no_dir, no_name
 
     def ensure_id_helper(node):
+        flag = False
         if (node.get('node_id') is None) or node.get('node_id') in id_set:
             node['node_id'] = gen_node_id()   
+            flag = True
 
         id_set.add(node['node_id'])
 
         if 'children' in node:
             for c in node["children"]:
-                ensure_id_helper(list(c.values())[0])
+                flag = flag or ensure_id_helper(list(c.values())[0])
     
-    def ensure_node_id(cfg_path, cfg):
-        ensure_id_helper(cfg)
-        dump_json(cfg_path, cfg, exist_ok=True, override=True)
+        return flag
+
+    def ensure_node_id(cfg):
+        return ensure_id_helper(cfg)
 
     def make_node(name, node_id, keywords, children=None):
         node = {}
@@ -80,7 +96,8 @@ def gen_tree(data_path):
     # 根节点
     cfg_path = os.path.join(data_path, 'config.json')
     cfg = load_json(cfg_path)
-    ensure_node_id(cfg_path, cfg)
+    if ensure_node_id(cfg):
+        dump_json(cfg_path, cfg)
     tree_node = {
         "node_id": cfg['node_id'],
         "keywords": cfg['keywords'],
@@ -92,48 +109,52 @@ def gen_tree(data_path):
     for level_no_dir, level_no_name in list_dir(data_path):
         print(level_no_dir)
         no, level_name = parse_no_name(level_no_name)
-        cfg_path = os.path.join(level_no_dir, 'config.json')
-        cfg = load_json(cfg_path)
-        ensure_node_id(cfg_path, cfg)
+        level_path = os.path.join(level_no_dir, 'config.json')
+        level_cfg = load_json(level_path)
+        if ensure_node_id(level_cfg) or check_export(level_no_dir, level_cfg):
+            dump_json(level_path, level_cfg, exist_ok=True, override=True)
 
         level_node, level_node_children = make_node(
             level_name, cfg['node_id'], cfg['keywords'])
         tree_node['children'].append(level_node)
 
-        
-
         # 章节点
         for chapter_no_dir, chapter_no_name in list_dir(level_no_dir):
             no, chapter_name = parse_no_name(chapter_no_name)
-            cfg_path = os.path.join(chapter_no_dir, 'config.json')
-            ensure_node_id(cfg_path, cfg)
-            cfg = load_json(cfg_path)
+            chapter_path = os.path.join(chapter_no_dir, 'config.json')
+            chapter_cfg = load_json(chapter_path)
+            if ensure_node_id(chapter_cfg) or check_export(chapter_no_dir, chapter_cfg):
+                dump_json(chapter_path, chapter_cfg, exist_ok=True, override=True)
 
             chapter_node, chapter_node_children = make_node(
-                chapter_name, cfg['node_id'], cfg['keywords'])
+                chapter_name, chapter_cfg['node_id'], chapter_cfg['keywords'])
             level_node_children.append(chapter_node)
 
             # 知识点
             for section_no_dir, section_no_name in list_dir(chapter_no_dir):
                 no, section_name = parse_no_name(section_no_name)
-                cfg_path = os.path.join(section_no_dir, 'config.json')
-                cfg = load_json(cfg_path)
-                ensure_node_id(cfg_path, cfg)
+                sec_path = os.path.join(section_no_dir, 'config.json')
+                sec_cfg = load_json(sec_path)
+                flag = ensure_node_id(sec_cfg) or check_export(section_no_dir, sec_cfg)
 
                 section_node, section_node_children = make_node(
-                    section_name, cfg['node_id'], cfg['keywords'], cfg['children'])
+                    section_name, sec_cfg['node_id'], sec_cfg['keywords'], sec_cfg['children'])
                 chapter_node_children.append(section_node)
 
                 # 确保习题分配了习题ID
-                for export in cfg['export']:
+                
+                for export in sec_cfg["export"]:
                     ecfg_path = os.path.join(section_no_dir, export)
                     ecfg = load_json(ecfg_path)
+
                     if (ecfg.get('exercise_id') is None) or (ecfg.get('exercise_id') in id_set):
-                        ecfg['exercise_id'] = uuid.uuid4().hex
+                        ecfg['exercise_id'] = uuid.uuid4().hex     
                         dump_json(ecfg_path, ecfg, exist_ok=True, override=True)
                         
                     id_set.add(ecfg['exercise_id'])
-                dump_json(cfg_path, cfg, exist_ok=True, override=True)
+
+                if flag:
+                    dump_json(cfg_path, cfg, exist_ok=True, override=True)
 
     # 保存技能树骨架
     tree_path = os.path.join(data_path, 'tree.json')