v10

lib/main.dart

@@ -4,7 +4,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:window_manager/window_manager.dart';
 
-import 'v10/app.dart';
+import 'v11/app.dart';
 
 void main() {
   WidgetsFlutterBinding.ensureInitialized();

lib/v10/app/navigation/router/iroute.dart

@@ -147,7 +147,6 @@ class CellIRoute extends IRouteNode {
     if (pageBuilder != null) {
       return pageBuilder!(context, config, child);
     }
-    print("======CellIRoute#createCellPage${config.pageKey}=================");
     return MaterialPage(
       child: child,
       key: config.pageKey,

lib/v11/app/navigation/router/app_router_delegate.dart

@@ -15,7 +15,7 @@ class AppRouterDelegate extends RouterDelegate<IRouteConfig>
   /// 核心数据，路由配置数据列表
   final List<IRouteConfig> _configs = [];
 
-  String get path => current.uri.path;
+  String get path => current.uri.toString();
 
   IRouteConfig get current => _configs.last;
 

lib/v11/app/navigation/router/iroute.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:iroute/v9/app/navigation/router/views/navigator_scope.dart';
 
 import 'iroute_config.dart';
+import 'utils/path_utils.dart';
 
 typedef IRoutePageBuilder = Page? Function(
   BuildContext context,
@@ -55,7 +56,7 @@ abstract class IRouteNode {
     if (node.children.isNotEmpty) {
       target = prefix + target;
 
-      List<IRouteNode> nodes = node.children.where((e) => e.path == target).toList();
+      List<IRouteNode> nodes = node.children.where((e) => _match(e.path,target)).toList();
       bool match = nodes.isNotEmpty;
       if (match) {
         IRouteNode matched = nodes.first;
@@ -69,6 +70,14 @@ abstract class IRouteNode {
     }
     return result;
   }
+
+  bool _match(String path ,String target){
+    if(!path.contains(':')){
+      return path == target;
+    }
+    return patternToRegExp(path,[]).hasMatch(target);
+  }
+
 }
 
 /// 优先调用 [pageBuilder] 构建 Page
@@ -147,7 +156,6 @@ class CellIRoute extends IRouteNode {
     if (pageBuilder != null) {
       return pageBuilder!(context, config, child);
     }
-    print("======CellIRoute#createCellPage${config.pageKey}=================");
     return MaterialPage(
       child: child,
       key: config.pageKey,

lib/v11/app/navigation/router/iroute_config.dart

@@ -10,6 +10,7 @@ class IRouteConfig {
   final Object? extra;
   final bool forResult;
   final Uri uri;
+  final Map<String,String>? pathParams;
   final bool keepAlive;
   final RouteStyle routeStyle;
   final bool recordHistory;
@@ -18,12 +19,13 @@ class IRouteConfig {
     this.extra,
     required this.uri,
     this.forResult = false,
+    this.pathParams,
     this.keepAlive = false,
     this.routeStyle = RouteStyle.replace,
     this.recordHistory = false,
   });
 
-  String get path => uri.path;
+  String get path => uri.toString();
 
   IRouteConfig copyWith({
     Object? extra,

lib/v11/app/navigation/router/routes.dart

@@ -43,7 +43,7 @@ CellIRoute appRoute = CellIRoute(
           widget: SortSettings(),
         ),
         const IRoute(
-          path: '/app/sort/player',
+          path: '/app/sort/player/:name',
           widget: SortPlayer(),
         ),
       ],
@@ -80,7 +80,7 @@ Map<String, String> kRouteLabelMap = {
   '/app/color/detail': '颜色详情',
   '/app/counter': '计数器',
   '/app/sort': '排序算法',
-  '/app/sort/player': '演示',
+  '/app/sort/:name': '',
   '/app/sort/settings': '排序配置',
   '/app/user': '我的',
   '/app/settings': '系统设置',

lib/v11/app/navigation/router/utils/path_utils.dart

@@ -0,0 +1,37 @@
+final RegExp _parameterRegExp = RegExp(r':(\w+)(\((?:\\.|[^\\()])+\))?');
+
+RegExp patternToRegExp(String pattern, List<String> parameters) {
+  final StringBuffer buffer = StringBuffer('^');
+  int start = 0;
+  for (final RegExpMatch match in _parameterRegExp.allMatches(pattern)) {
+    if (match.start > start) {
+      buffer.write(RegExp.escape(pattern.substring(start, match.start)));
+    }
+    final String name = match[1]!;
+    final String? optionalPattern = match[2];
+    final String regex = optionalPattern != null
+        ? _escapeGroup(optionalPattern, name)
+        : '(?<$name>[^/]+)';
+    buffer.write(regex);
+    parameters.add(name);
+    start = match.end;
+  }
+
+  if (start < pattern.length) {
+    buffer.write(RegExp.escape(pattern.substring(start)));
+  }
+
+  if (!pattern.endsWith('/')) {
+    buffer.write(r'(?=/|$)');
+  }
+  return RegExp(buffer.toString(), caseSensitive: false);
+}
+
+String _escapeGroup(String group, [String? name]) {
+  final String escapedGroup = group.replaceFirstMapped(
+      RegExp(r'[:=!]'), (Match match) => '\\${match[0]}');
+  if (name != null) {
+    return '(?<$name>$escapedGroup)';
+  }
+  return escapedGroup;
+}

lib/v11/app/navigation/views/app_navigation_rail.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:iroute/components/components.dart';
+import 'package:provider/provider.dart';
+import '../../../pages/sort/provider/state.dart';
 import '../router/app_router_delegate.dart';
 import '../router/iroute_config.dart';
 import '../router/routes.dart';
@@ -37,7 +39,7 @@ class _AppNavigationRailState extends State<AppNavigationRail> {
         tail: Padding(
           padding: const EdgeInsets.only(bottom: 6.0),
           child: Text(
-            'V0.0.10',
+            'V0.0.11',
             style: TextStyle(color: Colors.white, fontSize: 12),
           ),
         ),
@@ -66,6 +68,12 @@ class _AppNavigationRailState extends State<AppNavigationRail> {
       router.changePath(path, keepAlive: true,recordHistory: true);
       return;
     }
+    if(index ==2){
+      SortState state = SortStateScope.read(context);
+      String name = state.config.name;
+      router.changePath('/app/sort/$name',recordHistory: true);
+      return;
+    }
     if (index == 4) {
       router.changePath(path, style: RouteStyle.push,recordHistory: true);
       return;

lib/v11/app/navigation/views/app_top_bar/app_top_bar.dart

@@ -1,7 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:iroute/components/components.dart';
+import '../../../../pages/sort/provider/state.dart';
 import '../../router/app_router_delegate.dart';
 import '../../router/routes.dart';
+import '../../router/utils/path_utils.dart';
 import '../../router/views/route_back_indicator.dart';
 import 'app_router_editor.dart';
 import 'history_view_icon.dart';
@@ -83,6 +85,13 @@ class _RouterIndicatorState extends State<RouterIndicator> {
 
   void _onRouterChange() {
     setState(() {});
+    if(router.path.startsWith('/app/sort/')){
+      SortState state = SortStateScope.of(context);
+      String name = router.path.replaceAll('/app/sort/', '');
+      if(name!='settings'){
+        state.selectName(name);
+      }
+    }
   }
 
   List<BreadcrumbItem> pathToBreadcrumbItems(String path) {
@@ -97,7 +106,12 @@ class _RouterIndicatorState extends State<RouterIndicator> {
 
     for (String segment in uri.pathSegments) {
       to += '/$segment';
-      String label = kRouteLabelMap[to] ?? '未知路由';
+      String label = '';
+      if(to.startsWith('/app/sort/')){
+        label = to.replaceAll('/app/sort/', '');
+      }else{
+        label = kRouteLabelMap[to] ?? '未知路由';
+      }
       if(label.isNotEmpty){
         result.add(BreadcrumbItem(to: to, label: label, active: to == distPath));
       }

lib/v11/pages/color/color_page.dart

@@ -48,9 +48,10 @@ class _ColorPageState extends State<ColorPage> {
   }
 
   void _selectColor(Color color){
-    // String value = color.value.toRadixString(16);
-    // router.path = '/color/detail?color=$value';
-    router.changePath('/app/color/detail',extra: color);
+    String value = color.value.toRadixString(16);
+    String path = '/app/color/detail?color=$value';
+    // router.changePath('/app/color/detail',extra: color);
+    router.changePath(path,recordHistory: true);
 
   }
 

lib/v11/pages/sort/provider/state.dart

@@ -98,4 +98,7 @@ class SortStateScope extends InheritedNotifier<SortState> {
 
   static SortState of(BuildContext context) =>
       context.dependOnInheritedWidgetOfExactType<SortStateScope>()!.notifier!;
+
+  static SortState read(BuildContext context) =>
+      context.getInheritedWidgetOfExactType<SortStateScope>()!.notifier!;
 }

lib/v11/pages/sort/views/sort_page/sort_page.dart

@@ -81,7 +81,7 @@ class SortRailPanel extends StatelessWidget {
             options: sortNameMap.values.toList(),
             onSelected: (name) {
               state.selectName(name);
-              router.changePath('/app/sort/player');
+              router.changePath('/app/sort/${name}',recordHistory: true);
             },
           ),
         ),

lib/v9/app/navigation/router/iroute.dart

@@ -148,7 +148,6 @@ class CellIRoute extends IRouteNode {
     if (pageBuilder != null) {
       return pageBuilder!(context, config, child);
     }
-    print("======CellIRoute#createCellPage${config.pageKey}=================");
     return MaterialPage(
       child: child,
       key: config.pageKey,

test/algorithm/linked_list/206_reverse_list.dart

@@ -0,0 +1,39 @@
+
+void main(){
+  /// 打印 1->9->9->4
+  ListNode listNode = ListNode(1, ListNode(9, ListNode(9,ListNode(4))));
+  print(listNode);
+  ListNode? result = listNode.reverseList(listNode);
+  print(result);
+}
+
+class ListNode {
+  int val;
+  ListNode? next;
+  ListNode([this.val = 0, this.next]);
+
+  @override
+  String toString(){
+    ListNode? cur = this;
+    String result = "";
+    while( cur!=null){
+      result = result +cur.val.toString();
+      cur = cur.next;
+      if(cur!=null){
+        result +='->';
+      }
+    }
+    return result;
+  }
+
+  ListNode? reverseList(ListNode? head) {
+    if (head == null || head.next == null) return head;
+    ListNode? pre = reverseList(head.next);
+    head.next?.next = head;
+    head.next = null;
+    return pre;
+  }
+}
+
+
+

test/parser/path_utils.dart

@@ -0,0 +1,158 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+final RegExp _parameterRegExp = RegExp(r':(\w+)(\((?:\\.|[^\\()])+\))?');
+
+/// Converts a [pattern] such as `/user/:id` into [RegExp].
+///
+/// The path parameters can be specified by prefixing them with `:`. The
+/// `parameters` are used for storing path parameter names.
+///
+///
+/// For example:
+///
+///  `pattern` = `/user/:id/book/:bookId`
+///
+///  The `parameters` would contain `['id', 'bookId']` as a result of calling
+///  this method.
+///
+/// To extract the path parameter values from a [RegExpMatch], pass the
+/// [RegExpMatch] into [extractPathParameters] with the `parameters` that are
+/// used for generating the [RegExp].
+RegExp patternToRegExp(String pattern, List<String> parameters) {
+  final StringBuffer buffer = StringBuffer('^');
+  int start = 0;
+  for (final RegExpMatch match in _parameterRegExp.allMatches(pattern)) {
+    if (match.start > start) {
+      buffer.write(RegExp.escape(pattern.substring(start, match.start)));
+    }
+    final String name = match[1]!;
+    final String? optionalPattern = match[2];
+    final String regex = optionalPattern != null
+        ? _escapeGroup(optionalPattern, name)
+        : '(?<$name>[^/]+)';
+    buffer.write(regex);
+    parameters.add(name);
+    start = match.end;
+  }
+
+  if (start < pattern.length) {
+    buffer.write(RegExp.escape(pattern.substring(start)));
+  }
+
+  if (!pattern.endsWith('/')) {
+    buffer.write(r'(?=/|$)');
+  }
+  return RegExp(buffer.toString(), caseSensitive: false);
+}
+
+String _escapeGroup(String group, [String? name]) {
+  final String escapedGroup = group.replaceFirstMapped(
+      RegExp(r'[:=!]'), (Match match) => '\\${match[0]}');
+  if (name != null) {
+    return '(?<$name>$escapedGroup)';
+  }
+  return escapedGroup;
+}
+
+/// Reconstructs the full path from a [pattern] and path parameters.
+///
+/// This is useful for restoring the original path from a [RegExpMatch].
+///
+/// For example, A path matched a [RegExp] returned from [patternToRegExp] and
+/// produced a [RegExpMatch]. To reconstruct the path from the match, one
+/// can follow these steps:
+///
+/// 1. Get the `pathParameters` by calling [extractPathParameters] with the
+///    [RegExpMatch] and the parameters used for generating the [RegExp].
+/// 2. Call [patternToPath] with the `pathParameters` from the first step and
+///    the original `pattern` used for generating the [RegExp].
+String patternToPath(String pattern, Map<String, String> pathParameters) {
+  final StringBuffer buffer = StringBuffer();
+  int start = 0;
+  for (final RegExpMatch match in _parameterRegExp.allMatches(pattern)) {
+    if (match.start > start) {
+      buffer.write(pattern.substring(start, match.start));
+    }
+    final String name = match[1]!;
+    buffer.write(pathParameters[name]);
+    start = match.end;
+  }
+
+  if (start < pattern.length) {
+    buffer.write(pattern.substring(start));
+  }
+  return buffer.toString();
+}
+
+/// Extracts arguments from the `match` and maps them by parameter name.
+///
+/// The [parameters] should originate from the call to [patternToRegExp] that
+/// creates the [RegExp].
+Map<String, String> extractPathParameters(
+    List<String> parameters, RegExpMatch match) {
+  return <String, String>{
+    for (int i = 0; i < parameters.length; ++i)
+      parameters[i]: match.namedGroup(parameters[i])!
+  };
+}
+
+/// Concatenates two paths.
+///
+/// e.g: pathA = /a, pathB = c/d,  concatenatePaths(pathA, pathB) = /a/c/d.
+String concatenatePaths(String parentPath, String childPath) {
+  // at the root, just return the path
+  if (parentPath.isEmpty) {
+    assert(childPath.startsWith('/'));
+    assert(childPath == '/' || !childPath.endsWith('/'));
+    return childPath;
+  }
+
+  // not at the root, so append the parent path
+  assert(childPath.isNotEmpty);
+  assert(!childPath.startsWith('/'));
+  assert(!childPath.endsWith('/'));
+  return '${parentPath == '/' ? '' : parentPath}/$childPath';
+}
+
+/// Normalizes the location string.
+String canonicalUri(String loc) {
+  String canon = Uri.parse(loc).toString();
+  canon = canon.endsWith('?') ? canon.substring(0, canon.length - 1) : canon;
+
+  // remove trailing slash except for when you shouldn't, e.g.
+  // /profile/ => /profile
+  // / => /
+  // /login?from=/ => login?from=/
+  canon = canon.endsWith('/') && canon != '/' && !canon.contains('?')
+      ? canon.substring(0, canon.length - 1)
+      : canon;
+
+  // /login/?from=/ => /login?from=/
+  // /?from=/ => /?from=/
+  canon = canon.replaceFirst('/?', '?', 1);
+
+  return canon;
+}
+
+/// Builds an absolute path for the provided route.
+// String? fullPathForRoute(
+//     RouteBase targetRoute, String parentFullpath, List<RouteBase> routes) {
+//   for (final RouteBase route in routes) {
+//     final String fullPath = (route is GoRoute)
+//         ? concatenatePaths(parentFullpath, route.path)
+//         : parentFullpath;
+//
+//     if (route == targetRoute) {
+//       return fullPath;
+//     } else {
+//       final String? subRoutePath =
+//           fullPathForRoute(targetRoute, fullPath, route.routes);
+//       if (subRoutePath != null) {
+//         return subRoutePath;
+//       }
+//     }
+//   }
+//   return null;
+// }

test/parser/uri.dart

@@ -0,0 +1,107 @@
+import 'path_utils.dart';
+
+void main() {
+  String pattern = '/user/:id/book/:bookId';
+  String path = '/user/001/book/card';
+
+  parserPath();
+  // List<String> params = [];
+  // RegExp regExp = patternToRegExp(pattern,params);
+  //
+  //
+  // bool data = regExp.hasMatch(path);
+  // List<RegExpMatch> matchs = regExp.allMatches(path).toList();
+  // Map<String,String?> pathParams = {};
+  // if(matchs.isNotEmpty){
+  //
+  //   for(int i=0;i<params.length;i++){
+  //    String? value = matchs.first.namedGroup(params[i]);
+  //    pathParams[params[i]] = value;
+  //   }
+  // }
+  //
+  // print(pathParams);
+  // print(regExp.pattern);
+  //
+  // // match.forEach((element) {
+  // //   print(element.namedGroup('id'));
+  // // });
+  // // regExp
+  // print(params);
+  // String ret = patternToPath(pattern, {
+  //   'id':'0',
+  //   'bookId':'card',
+  // });
+  // print(regExp);
+  // print(ret);
+}
+
+void parserPath() {
+  String template = '/user/:id/book/:bookId';
+  String path = '/user/001/book/card';
+  List<String> keys = [];
+  RegExp regExp = patternToRegExp(template,keys);
+  Map<String, String?> pathParams = {};
+  RegExpMatch? match = regExp.firstMatch(path);
+
+  if (match != null) {
+    for (int i = 0; i < keys.length; i++) {
+      String? value = match.namedGroup(keys[i]);
+      pathParams[keys[i]] = value;
+    }
+  }
+  print(pathParams);
+}
+
+
+final RegExp _parameterRegExp = RegExp(r':(\w+)(\((?:\\.|[^\\()])+\))?');
+
+RegExp patternToRegExp(String pattern, List<String> parameters) {
+  final StringBuffer buffer = StringBuffer('^');
+  int start = 0;
+  for (final RegExpMatch match in _parameterRegExp.allMatches(pattern)) {
+    if (match.start > start) {
+      buffer.write(RegExp.escape(pattern.substring(start, match.start)));
+    }
+    final String name = match[1]!;
+    final String? optionalPattern = match[2];
+    final String regex = optionalPattern != null
+        ? _escapeGroup(optionalPattern, name)
+        : '(?<$name>[^/]+)';
+    buffer.write(regex);
+    parameters.add(name);
+    start = match.end;
+  }
+
+  if (start < pattern.length) {
+    buffer.write(RegExp.escape(pattern.substring(start)));
+  }
+
+  if (!pattern.endsWith('/')) {
+    buffer.write(r'(?=/|$)');
+  }
+  return RegExp(buffer.toString(), caseSensitive: false);
+}
+
+String _escapeGroup(String group, [String? name]) {
+  final String escapedGroup = group.replaceFirstMapped(
+      RegExp(r'[:=!]'), (Match match) => '\\${match[0]}');
+  if (name != null) {
+    return '(?<$name>$escapedGroup)';
+  }
+  return escapedGroup;
+}
+
+void parser() {
+  String path =
+      'http://user:pwd@toly1994.com:8080/path1/path2?key1=value1&key2=value2#fragment';
+  Uri? uri = Uri.tryParse(path);
+  if (uri == null) return;
+  print(uri.scheme); // http
+  print(uri.userInfo); // user:pwd
+  print(uri.host); // toly1994.com
+  print(uri.port); // 8080
+  print(uri.path); // /path1/path2
+  print(uri.query); // key1=value1&key2=value2
+  print(uri.fragment); // fragment
+}

test/structure/link_list/find.dart

@@ -0,0 +1,204 @@
+/// Dart、Rust 、C++ 、Java
+
+void main() {
+  ListNode listNode = ListNode(0, ListNode(3, ListNode(2, ListNode(8))));
+  print(listNode);
+
+  // List<int> evens = listNode.getEvenValue();
+  // print(evens);
+
+  // List<int> values = listNode.getValueByStep(2);
+  // print(values);
+
+  // listNode.deleteAt(3);
+  // ListNode? ret = listNode.deleteFromEnd(2);
+  // print(ret);
+
+  // ListNode? middleNode1 = listNode.middleNode1();
+  // print(middleNode1);
+
+  ListNode? middleNode2 = listNode.middleNode2();
+  print(middleNode2);
+  // ListNode? findNode = listNode.find(8);
+  // if(findNode!=null){
+  //   ListNode? result =  listNode.deleteNode(findNode);
+  //   // 0->2->8
+  //   print(result);
+  // }
+}
+
+class ListNode {
+  int val;
+  ListNode? next;
+  ListNode([this.val = 0, this.next]);
+
+  //// region [2023.11.20]
+  @override
+  String toString() {
+    ListNode? cur = this;
+    String result = "";
+    while (cur != null) {
+      result = result + cur.val.toString();
+      cur = cur.next;
+      if (cur != null) {
+        result += '->';
+      }
+    }
+    return result;
+  }
+
+  // endregion
+
+  //// region [2023.11.21]
+  /// [2023.11.21] TODO: 完成 find 函数，在链表中查找指定值的首位节点
+  ListNode? find(int target) {
+    ListNode? cur = this;
+    while (cur != null) {
+      if (cur.val == target) {
+        return cur;
+      }
+      cur = cur.next;
+    }
+    return null;
+  }
+
+  /// [2023.11.21]
+  /// TODO: LeetCode 237 删除指定节点(非尾结点)
+  void deleteNodeNotLast(ListNode node) {
+    if (node.next != null) {
+      node.val = node.next!.val;
+      node.next = node.next?.next;
+    }
+  }
+
+  // endregion
+
+  //// region [2023.11.22]
+  /// [2023.11.22]
+  /// TODO: 完成 size 方法，返回链表长度
+  int size() {
+    int i = 0;
+    ListNode? cur = this;
+    while (cur != null) {
+      cur = cur.next;
+      i++;
+    }
+    return i;
+  }
+
+  /// [2023.11.22]
+  /// TODO: 完成 deleteAt 方法，删除第 index 个节点
+  void deleteAt(int index) {
+    if (index == 0) {
+      ListNode? next = this.next;
+      this.val = next?.val ?? -1;
+      this.next = next?.next;
+      next?.next = null;
+      return;
+    }
+
+    ListNode? cur = this;
+    for (int i = 0; i < index - 1; i++) {
+      cur = cur?.next;
+    }
+    ListNode? target = cur?.next;
+    cur?.next = target?.next;
+    target?.next = null;
+  }
+
+  /// [2023.11.22]
+  /// TODO: LeetCode 19 删除链表的倒数第 N 个节点
+  ListNode? deleteFromEnd(int n) {
+    ListNode? dummy = ListNode(0, this);
+    ListNode? first = this;
+    ListNode? second = dummy;
+    for (int i = 0; i < n; ++i) {
+      first = first?.next;
+    }
+    while (first != null) {
+      first = first.next;
+      second = second?.next;
+    }
+    second?.next = second.next?.next;
+    return dummy.next;
+  }
+
+  ListNode? deleteNode(ListNode node) {
+    ListNode? cur = this;
+    if (cur == node) {
+      cur = cur.next!;
+      return cur;
+    }
+    while (cur != null) {
+      if (cur.next == node) {
+        cur.next = cur.next?.next;
+        return this;
+      }
+      cur = cur.next;
+    }
+    return this;
+  }
+
+  // endregion
+
+  //// region [2023.11.23]
+  /// [2023.11.23]
+  /// TODO: 完成 getEvenValue 方法，
+  /// 返回链表中偶数节点的值列表
+  List<int> getEvenValue() {
+    ListNode? cur = this;
+    List<int> result = [];
+
+    while (cur != null) {
+      result.add(cur.val);
+      cur = cur.next?.next;
+    }
+    return result;
+  }
+
+  /// TODO: 完成 getValueByStep 方法，
+  /// 返回链表中每隔 step 个节点的值列表
+  /// 例:
+  /// 链表: 0->3->2->8->9
+  /// step=3 : 输出 [0, 8]
+  /// step=2 : 输出 [0, 2, 9]
+  List<int> getValueByStep(int step) {
+    ListNode? cur = this;
+    List<int> result = [];
+
+    while (cur != null) {
+      result.add(cur.val);
+      for (int i = 0; i < step; i++) {
+        cur = cur?.next;
+      }
+    }
+    return result;
+  }
+
+  /// [2023.11.23]
+  /// TODO: LeetCode 876 链表的中间结点
+  /// [1,2,3,4,5] -> [3,4,5]
+  /// [1,2,3,4,5,6] -> [4,5,6]
+  /// 时间 O(N) 空间 O(N)
+  ListNode? middleNode1() {
+    List<ListNode?> nodes = [];
+    ListNode? cur = this;
+    while (cur != null) {
+      nodes.add(cur);
+      cur = cur.next;
+    }
+    return nodes[nodes.length ~/ 2];
+  }
+
+  /// 使用快慢指针 - 一次遍历
+  ListNode? middleNode2() {
+    ListNode? slow = this;
+    ListNode? fast = this;
+    while (fast != null && fast.next != null) {
+      slow = slow?.next;
+      fast = fast.next?.next;
+    }
+    return slow;
+  }
+// endregion
+}

test/structure/link_list/linked_list.dart

@@ -0,0 +1,3 @@
+class LikedList<T>{
+
+}

test/structure/link_list/print.dart

@@ -23,7 +23,4 @@ class ListNode {
     }
     return result;
   }
-
-
-
 }