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Merge pull request #118 from ikesnowy/Day41
Day41
2 parents ea6a525 + 80d82c3 commit c6e1e55

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‎1 Fundamental/1.3/1.3.45/1.3.45.csproj‎

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<ItemGroup>
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<None Include="App.config" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\Generics\Generics.csproj">
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<Project>{52b10c1b-78f7-493b-ab00-58efd921fda6}</Project>
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<Name>Generics</Name>
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</ProjectReference>
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎1 Fundamental/1.3/1.3.45/Program.cs‎

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@@ -1,8 +1,8 @@
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using Generics;
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namespace _1._3._45
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{
@@ -23,7 +23,83 @@ class Program
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static void Main(string[] args)
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{
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//给定输入序列，判断是否会出现下溢出。
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//给定输入和输出序列，判断是否相符合。
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string input = "- 0 1 2 3 4 5 6 7 8 9 - - - - - - - - -";
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Console.WriteLine(IsUnderflow(input.Split(' ')));//True
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input = "0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 -";
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Console.WriteLine(IsUnderflow(input.Split(' ')));//False
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//给定输出序列，判定是否可能。
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int[] output = { 4, 3, 2, 1, 0, 9, 8, 7, 6, 5 };
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Console.WriteLine(IsOutputPossible(output));//True
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output = new int[]{ 4, 6, 8, 7, 5, 3, 2, 9, 0, 1};
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Console.WriteLine(IsOutputPossible(output));//False
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}
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/// <summary>
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/// 判断是否会出现下溢出。
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/// </summary>
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/// <param name="input">输入序列。</param>
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/// <returns></returns>
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static bool IsUnderflow(string[] input)
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{
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//记录栈中元素数量，如果元素数量小于 0 则会出现下溢出。
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int count = 0;
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foreach (string s in input)
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{
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if (count < 0)
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{
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return true;
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}
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if (s.Equals("-"))
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{
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count--;
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}
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else
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{
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count++;
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}
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}
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return false;
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}
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static bool IsOutputPossible(int[] output)
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{
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int input = 0;
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int N = output.Length;
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Stack<int> stack = new Stack<int>();
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foreach (int i in output)
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{
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//如果栈为空，则从输入序列中压入一个数。
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if (stack.IsEmpty())
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{
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stack.Push(input);
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input++;
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}
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//如果输入序列中的所有数都已经入栈过了，跳出循环。
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if (input == N && stack.Peek() != i)
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{
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break;
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}
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//如果输出序列的下一个数不等于栈顶的数，那么就从输入序列中压入一个数。
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while (stack.Peek() != i && input < N)
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{
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stack.Push(input);
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input++;
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}
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//如果栈顶的数等于输出的数，弹出它。
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if (stack.Peek() == i)
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{
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stack.Pop();
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}
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}
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return stack.IsEmpty();
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}
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}
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}

‎1 Fundamental/1.3/1.3.46/1.3.46.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{C5FBF10A-8FD5-42AB-BFB1-5012F3FEE320}</ProjectGuid>
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<OutputType>Exe</OutputType>
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<RootNamespace>_1._3._46</RootNamespace>
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<AssemblyName>1.3.46</AssemblyName>
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<TargetFrameworkVersion>v4.7</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎1 Fundamental/1.3/1.3.46/App.config‎

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<?xml version="1.0" encoding="utf-8" ?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7" />
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</startup>
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</configuration>

‎1 Fundamental/1.3/1.3.46/Program.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace _1._3._46
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{
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/*
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* 1.3.46
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*
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* 栈的可生成性问题中禁止出现的排列。
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* 若三元组 (a, b, c) 中 a<b<c 且 c 最先被弹出，a 第二，b 第三
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* （c 和 a 以及 a 和 b 之间可以间隔其他整数），
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* 那么当且仅当排列中不含这样的三元组时（如上题所述的）栈才可能生成它。
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*
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*/
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class Program
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{
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static void Main(string[] args)
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{
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//证明参考：http://ceeji.net/blog/forbidden-triple-for-stack-generability/
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//显然书中的解答已经十分明确，这里简单说明一下：
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//首先有结论：对于栈顶元素 Sn，栈中所有小于 Sn 的值都以递减形式保存（已经输出的不算）。
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//表现在输出序列中，Sn 输出之后，如果有小于 Sn 的值输出，其顺序必定是递减的。
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//例如序列 4 3 2 1 0 9 8 7 6 5
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//4 输出之后，3 2 1 0 递减输出；9 输出之后，8 7 6 5 递减输出。
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//依次验证其中的每个值都能满足结论。
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//而对于序列 4 6 8 7 5 3 2 9 0 1
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//对于 4，之后的 3 2 1 0 并不是以递减顺序输出的，因此这个序列是不合法的。
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}
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}
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}

‎1 Fundamental/1.3/1.3.46/Properties/AssemblyInfo.cs‎

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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// 有关程序集的一般信息由以下
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// 控制。更改这些特性值可修改
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// 与程序集关联的信息。
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[assembly: AssemblyTitle("1.3.46")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("1.3.46")]
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[assembly: AssemblyCopyright("Copyright © 2017")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// 将 ComVisible 设置为 false 会使此程序集中的类型
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//对 COM 组件不可见。如果需要从 COM 访问此程序集中的类型
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//请将此类型的 ComVisible 特性设置为 true。
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[assembly: ComVisible(false)]
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// 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
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[assembly: Guid("c5fbf10a-8fd5-42ab-bfb1-5012f3fee320")]
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// 程序集的版本信息由下列四个值组成:
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//
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// 主版本
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// 次版本
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// 生成号
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// 修订号
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//
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// 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
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// 方法是按如下所示使用“*”: :
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

‎1 Fundamental/1.3/1.3.47/1.3.47.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProjectGuid>{4FA8E7F0-87A7-4084-BA27-BA5DF4CE18A1}</ProjectGuid>
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<OutputType>Exe</OutputType>
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<RootNamespace>_1._3._47</RootNamespace>
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<AssemblyName>1.3.47</AssemblyName>
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<TargetFrameworkVersion>v4.7</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<PlatformTarget>AnyCPU</PlatformTarget>
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="Steque.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\Generics\Generics.csproj">
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<Project>{52b10c1b-78f7-493b-ab00-58efd921fda6}</Project>
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<Name>Generics</Name>
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</ProjectReference>
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎1 Fundamental/1.3/1.3.47/App.config‎

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<?xml version="1.0" encoding="utf-8" ?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7" />
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</startup>
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</configuration>

‎1 Fundamental/1.3/1.3.47/Program.cs‎

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using System;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using Generics;
6+
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namespace _1._3._47
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{
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/*
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* 1.3.47
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*
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* 可连接的队列、栈或 steque。
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* 为队列、栈或 steque（见练习 1.3.32）添加一个能够（破坏性地）链接两个同类对象的额外操作 catenation。
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*
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*/
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class Program
17+
{
18+
static void Main(string[] args)
19+
{
20+
Queue<string> q1 = new Queue<string>();
21+
q1.Enqueue("first");
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q1.Enqueue("second");
23+
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Queue<string> q2 = new Queue<string>();
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q2.Enqueue("third");
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q2.Enqueue("fourth");
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q1 = Queue<string>.Catenation(q1, q2);
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Console.WriteLine(q1);
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Stack<string> s1 = new Stack<string>();
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s1.Push("first");
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s1.Push("second");
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Stack<string> s2 = new Stack<string>();
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s2.Push("third");
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s2.Push("fourth");
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s2 = Stack<string>.Catenation(s2, s1);
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Console.WriteLine(s2);
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Steque<string> sq1 = new Steque<string>();
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sq1.Push("first");
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sq1.Enqueue("second");
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Steque<string> sq2 = new Steque<string>();
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sq2.Push("third");
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sq2.Enqueue("fourth");
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sq1 = Steque<string>.Catenation(sq1, sq2);
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Console.WriteLine(sq1);
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}
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}
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}

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