Merge pull request #440 from ikesnowy/dev

2.5 Finished
ikesnowy · Jan 27, 2019 · fb20e2a · fb20e2a
2 parents 5f1fafb + 269d4e9
commit fb20e2a
Show file tree

Hide file tree

Showing 181 changed files with 46,019 additions and 10 deletions.
diff --git a/2 Sorting/2.3/Quick/QuickSort.cs b/2 Sorting/2.3/Quick/QuickSort.cs
@@ -69,6 +69,32 @@ private int Partition<T>(T[] a, int lo, int hi) where T : IComparable<T>
             return j;
         }
 
+        /// <summary>
+        /// 令 a[k] 变成第 k 小的元素。
+        /// </summary>
+        /// <typeparam name="T">元素类型。</typeparam>
+        /// <param name="a">需要排序的数组。</param>
+        /// <param name="k">序号</param>
+        /// <returns></returns>
+        public T Select<T>(T[] a, int k) where T : IComparable<T>
+        {
+            if (k < 0 || k > a.Length)
+                throw new IndexOutOfRangeException("Select elements out of bounds");
+            Shuffle(a);
+            int lo = 0, hi = a.Length - 1;
+            while (hi > lo)
+            {
+                int i = Partition(a, lo, hi);
+                if (i > k)
+                    hi = i - 1;
+                else if (i < k)
+                    lo = i + 1;
+                else
+                    return a[i];
+            }
+            return a[lo];
+        }
+
         /// <summary>
         /// 打乱数组。
         /// </summary>

diff --git a/2 Sorting/2.4/PriorityQueue/MinPQ.cs b/2 Sorting/2.4/PriorityQueue/MinPQ.cs
@@ -120,21 +120,21 @@ public void Insert(Key v)
         public int Size() => this.n;
 
         /// <summary>
-        /// 获取堆的迭代器，元素以降序排列。
+        /// 获取堆的迭代器，元素以升序排列。
         /// </summary>
         /// <returns></returns>
         public IEnumerator<Key> GetEnumerator()
         {
-            MaxPQ<Key> copy = new MaxPQ<Key>(this.n);
+            MinPQ<Key> copy = new MinPQ<Key>(this.n);
             for (int i = 1; i <= this.n; i++)
                 copy.Insert(this.pq[i]);
 
             while (!copy.IsEmpty())
-                yield return copy.DelMax(); // 下次迭代的时候从这里继续执行。
+                yield return copy.DelMin(); // 下次迭代的时候从这里继续执行。
         }
 
         /// <summary>
-        /// 获取堆的迭代器，元素以降序排列。
+        /// 获取堆的迭代器，元素以升序排列。
         /// </summary>
         /// <returns></returns>
         IEnumerator IEnumerable.GetEnumerator()

diff --git a/2 Sorting/2.4/PriorityQueue/MinPQX.cs b/2 Sorting/2.4/PriorityQueue/MinPQX.cs
@@ -119,21 +119,21 @@ public void Insert(Key v)
         public int Size() => this.n;
 
         /// <summary>
-        /// 获取堆的迭代器，元素以降序排列。
+        /// 获取堆的迭代器，元素以升序排列。
         /// </summary>
         /// <returns></returns>
         public IEnumerator<Key> GetEnumerator()
         {
-            MaxPQ<Key> copy = new MaxPQ<Key>(this.n);
+            MinPQ<Key> copy = new MinPQ<Key>(this.n);
             for (int i = 1; i <= this.n; i++)
                 copy.Insert(this.pq[i]);
 
             while (!copy.IsEmpty())
-                yield return copy.DelMax(); // 下次迭代的时候从这里继续执行。
+                yield return copy.DelMin(); // 下次迭代的时候从这里继续执行。
         }
 
         /// <summary>
-        /// 获取堆的迭代器，元素以降序排列。
+        /// 获取堆的迭代器，元素以升序排列。
         /// </summary>
         /// <returns></returns>
         IEnumerator IEnumerable.GetEnumerator()

diff --git a/2 Sorting/2.5/2.5.1/2.5.1.csproj b/2 Sorting/2.5/2.5.1/2.5.1.csproj
@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{CC3F5E6E-EE3B-41DA-8098-50D38CD55A7F}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>_2._5._1</RootNamespace>
+    <AssemblyName>2.5.1</AssemblyName>
+    <TargetFrameworkVersion>v4.7</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
diff --git a/2 Sorting/2.5/2.5.1/App.config b/2 Sorting/2.5/2.5.1/App.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7" />
+    </startup>
+</configuration>
diff --git a/2 Sorting/2.5/2.5.1/Program.cs b/2 Sorting/2.5/2.5.1/Program.cs
@@ -0,0 +1,24 @@
+using System;
+
+namespace _2._5._1
+{
+    /*
+     * 2.5.1
+     * 
+     * 在下面这段 String 类型的 compareTo() 方法的实现中，
+     * 第三行对提高运行效率有何帮助？
+     * 
+     */
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            // if (this == that) return 0;
+            // 如果比较的两个 string 是同一个对象的引用，直接返回相等结果
+            // 而不必再逐字符比较。
+            string s = "123456";
+            string p = s;
+            Console.WriteLine(s.CompareTo(p));  // 输出 0
+        }
+    }
+}
diff --git a/2 Sorting/2.5/2.5.1/Properties/AssemblyInfo.cs b/2 Sorting/2.5/2.5.1/Properties/AssemblyInfo.cs
@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// 有关程序集的一般信息由以下
+// 控制。更改这些特性值可修改
+// 与程序集关联的信息。
+[assembly: AssemblyTitle("2.5.1")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("2.5.1")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// 将 ComVisible 设置为 false 会使此程序集中的类型
+//对 COM 组件不可见。如果需要从 COM 访问此程序集中的类型
+//请将此类型的 ComVisible 特性设置为 true。
+[assembly: ComVisible(false)]
+
+// 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
+[assembly: Guid("cc3f5e6e-ee3b-41da-8098-50d38cd55a7f")]
+
+// 程序集的版本信息由下列四个值组成: 
+//
+//      主版本
+//      次版本
+//      生成号
+//      修订号
+//
+// 可以指定所有值，也可以使用以下所示的 "*" 预置版本号和修订号
+// 方法是按如下所示使用“*”: :
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/2 Sorting/2.5/2.5.10/2.5.10.csproj b/2 Sorting/2.5/2.5.10/2.5.10.csproj
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{AE4E57EE-9891-4DDB-96B1-B875371BC222}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>_2._5._10</RootNamespace>
+    <AssemblyName>2.5.10</AssemblyName>
+    <TargetFrameworkVersion>v4.7</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Version.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
diff --git a/2 Sorting/2.5/2.5.10/App.config b/2 Sorting/2.5/2.5.10/App.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7" />
+    </startup>
+</configuration>
diff --git a/2 Sorting/2.5/2.5.10/Program.cs b/2 Sorting/2.5/2.5.10/Program.cs
@@ -0,0 +1,29 @@
+using System;
+
+namespace _2._5._10
+{
+    /*
+     * 2.5.10
+     * 
+     * 创建一个数据类型 Version 来表示软件的版本，
+     * 例如 155.1.1、155.10.1、155.10.2。
+     * 为它实现 Comparable 接口，
+     * 其中 115.1.1 的版本低于 115.10.1。
+     * 
+     */
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Version[] versions = new Version[3];
+            versions[0] = new Version("155.10.1");
+            versions[1] = new Version("155.1.1");
+            versions[2] = new Version("155.10.2");
+            Array.Sort(versions);
+            for (int i = 0; i < versions.Length; i++)
+            {
+                Console.WriteLine(versions[i]);
+            }
+        }
+    }
+}
diff --git a/2 Sorting/2.5/2.5.10/Properties/AssemblyInfo.cs b/2 Sorting/2.5/2.5.10/Properties/AssemblyInfo.cs
@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// 有关程序集的一般信息由以下
+// 控制。更改这些特性值可修改
+// 与程序集关联的信息。
+[assembly: AssemblyTitle("2.5.10")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("2.5.10")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// 将 ComVisible 设置为 false 会使此程序集中的类型
+//对 COM 组件不可见。如果需要从 COM 访问此程序集中的类型
+//请将此类型的 ComVisible 特性设置为 true。
+[assembly: ComVisible(false)]
+
+// 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
+[assembly: Guid("ae4e57ee-9891-4ddb-96b1-b875371bc222")]
+
+// 程序集的版本信息由下列四个值组成: 
+//
+//      主版本
+//      次版本
+//      生成号
+//      修订号
+//
+// 可以指定所有值，也可以使用以下所示的 "*" 预置版本号和修订号
+// 方法是按如下所示使用“*”: :
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/2 Sorting/2.5/2.5.10/Version.cs b/2 Sorting/2.5/2.5.10/Version.cs
@@ -0,0 +1,43 @@
+using System;
+
+namespace _2._5._10
+{
+    /// <summary>
+    /// 版本号。
+    /// </summary>
+    class Version : IComparable<Version>
+    {
+        private int[] versionNumber;
+
+        public Version(string version)
+        {
+            string[] versions = version.Split('.');
+            this.versionNumber = new int[versions.Length];
+            for (int i = 0; i < versions.Length; i++)
+            {
+                this.versionNumber[i] = int.Parse(versions[i]);
+            }
+        }
+
+        public int CompareTo(Version other)
+        {
+            for (int i = 0; i < this.versionNumber.Length && i < other.versionNumber.Length; i++)
+            {
+                if (this.versionNumber[i].CompareTo(other.versionNumber[i]) != 0)
+                    return this.versionNumber[i].CompareTo(other.versionNumber[i]);
+            }
+            return this.versionNumber.Length.CompareTo(other.versionNumber.Length);
+        }
+
+        public override string ToString()
+        {
+            string result = "";
+            for (int i = 0; i < this.versionNumber.Length - 1; i++)
+            {
+                result += this.versionNumber[i] + ".";
+            }
+            result += this.versionNumber[this.versionNumber.Length - 1].ToString();
+            return result;
+        }
+    }
+}