create tree

data/3.C语言高阶/3.位运算/7.位字段/bit_field.json

 {
   "type": "code_options",
   "author": "幻灰龙",
-    "source": "bit_field.md"
+  "source": "bit_field.md",
+  "exercise_id": "3956873149544809b85309a109c6c03b"
 }
\ No newline at end of file

data/3.C语言高阶/6.存储管理/2.内存动态管理/config.json

@@ -14,7 +14,8 @@
                     "malloc",
                     "C语言"
                 ],
-                "children": []
+                "children": [],
+                "node_id": "cc8211e14d6f46c8b91b27f4b5ae2c3a"
             }
         },
         {
@@ -24,7 +25,8 @@
                     "free",
                     "C语言"
                 ],
-                "children": []
+                "children": [],
+                "node_id": "3ef9cac7dde7450cba53d20005fefe77"
             }
         }
     ],

data/tree.json

@@ -1504,7 +1504,7 @@
                               "C语言"
                             ],
                             "children": [],
-                            "node_id": "db508a67e5fa4092ae5f130e59e15941"
+                            "node_id": "cc8211e14d6f46c8b91b27f4b5ae2c3a"
                           }
                         },
                         {
@@ -1514,7 +1514,8 @@
                               "free",
                               "C语言"
                             ],
-                            "children": []
+                            "children": [],
+                            "node_id": "3ef9cac7dde7450cba53d20005fefe77"
                           }
                         }
                       ]