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‎HashTable/HashTable.Lib/Boomerangs.cs

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/* ==============================================================================
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* 功能描述：Boomerangs
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* 创 建 者：gz
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* 创建日期：2017/4/28 18:24:56
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* ==============================================================================*/
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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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//Given n points in the plane that are all pairwise distinct, a “boomerang” is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters).
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//Find the number of boomerangs. You may assume that n will be at most 500 and coordinates of points are all in the range [-10000, 10000] (inclusive).
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//Example:
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//Input:
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//[[0,0],[1,0],[2,0]]
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//Output:
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//2
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//Explanation:
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//The two boomerangs are [[1,0],[0,0],[2,0]] and [[1,0],[2,0],[0,0]]
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namespace HashTable.Lib
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{
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/// <summary>
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/// Boomerangs
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/// </summary>
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public class Boomerangs
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{
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#region 公有方法
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public static int NumberOfBoomerangs(int[,] points)
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{
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Dictionary<double, int> dict = new Dictionary<double, int>();
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int len = points.GetUpperBound(0);
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int rtnCnt = 0;
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for (int i = 0; i <= len; i++)
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{
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//3点变2点
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for (int j = 0; j <= len; j++)
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{
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if (i == j) continue;
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double d = distance(points[i, 0], points[j, 0], points[i, 1], points[j, 1]);
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if (dict.ContainsKey(d))
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dict[d]++;
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else dict.Add(d, 1);
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}
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foreach (var item in dict)
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{
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if (item.Value > 1)
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{
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//如果找到了value个，因为有顺序，所以排序
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rtnCnt += item.Value * (item.Value - 1);
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}
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}
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dict.Clear();
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}
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return rtnCnt;
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}
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private static double distance(int x1, int x2, int y1, int y2)
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{
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int x = x1 - x2;
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int y = y1 - y2;
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return Math.Sqrt(x * x + y * y);
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}
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#endregion
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}
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}

‎HashTable/HashTable.Lib/HashTable.Lib.csproj

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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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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<ProductVersion>8.0.30703</ProductVersion>
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<SchemaVersion>2.0</SchemaVersion>
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<ProjectGuid>{2DAA0642-6344-4AAA-A001-A72C0E416B99}</ProjectGuid>
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<OutputType>Library</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>HashTable.Lib</RootNamespace>
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<AssemblyName>HashTable.Lib</AssemblyName>
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<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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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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<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.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Boomerangs.cs" />
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<Compile Include="LongestPalindrome.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="SingleOneSln.cs" />
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<Compile Include="TwoSumSln.cs" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
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Other similar extension points exist, see Microsoft.Common.targets.
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<Target Name="BeforeBuild">
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</Target>
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<Target Name="AfterBuild">
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</Target>
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-->
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</Project>

‎HashTable/HashTable.Lib/LongestPalindrome.cs

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/* ==============================================================================
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* 功能描述：LongestPalindrome
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* 创 建 者：gz
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* 创建日期：2017/4/28 18:28:39
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* ==============================================================================*/
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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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//Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters.
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//This is case sensitive, for example “Aa” is not considered a palindrome here.
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//Note:
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//Assume the length of given string will not exceed 1,010.
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//Example:
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//Input:
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//"abccccdd"
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//Output:
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//7
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//Explanation:
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//One longest palindrome that can be built is "dccaccd", whose length is 7.
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namespace HashTable.Lib
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{
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/// <summary>
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/// LongestPalindrome
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/// </summary>
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public class LongestPalindrome
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{
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#region 公有方法
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//借助哈希表，或字典，求某个字符出现的个数，若为偶数，则取字符串中此字符所有个数，
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//若为奇数，个数减1即可，只保留一个奇数不减去1。
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public int NumberOfPalindrome(string s)
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{
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HashSet<int> hash = new HashSet<int>();
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int count = 0;
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foreach (var item in s)
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{
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if (hash.Contains(item))
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{
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hash.Remove(item); //配对成功，
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count++; //count加1
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}
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else
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hash.Add(item);
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}
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return hash.Count > 0 ? count * 2 + 1 : count * 2;
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}
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public int NumberOfPalindrome2(string s)
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{
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Dictionary<char, int> dict = s.GroupBy(item => item).ToDictionary(g => g.Key, g => g.ToArray().Count());
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int rtn = dict.Where(item => item.Value % 2 == 0).Sum(item => item.Value);
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var oddList = dict.Where(item => item.Value % 2 == 1);
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int oddCount = oddList.Count();
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if (oddCount > 0)
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return rtn + oddList.Sum(r => r.Value) - oddCount + 1;
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return rtn;
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}
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#endregion
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}
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}

‎HashTable/HashTable.Lib/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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// 有关程序集的常规信息通过以下
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// 特性集控制。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("HashTable.Lib")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("HashTable.Lib")]
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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 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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// 则将该类型上的 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("668e90bd-68c0-45eb-b664-592ec4a86b6b")]
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// 程序集的版本信息由下面四个值组成:
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//
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// 主版本
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// 次版本
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// 内部版本号
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// 修订号
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//
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// 可以指定所有这些值，也可以使用“内部版本号”和“修订号”的默认值，
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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")]

‎HashTable/HashTable.Lib/SingleOneSln.cs

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/* ==============================================================================
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* 功能描述：Solution
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* 创 建 者：gz
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* 创建日期：2017/4/28 18:18:07
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* ==============================================================================*/
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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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namespace HashTable.Lib
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{
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/// <summary>
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/// Solution
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/// </summary>
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public class SingleOneSln
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{
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#region 公有方法
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//Given an array of integers, every element appears twice except for one. Find that single one.
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public static int SingleNumber1(int[] nums)
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{
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HashSet<int> hash = new HashSet<int>();
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foreach (int item in nums)
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{
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if (hash.Contains(item))
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hash.Remove(item);
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else
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hash.Add(item);
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}
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return hash.Min();
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}
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public static int SingleNumber2(int[] nums)
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{
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int rslt = nums[0];
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for (int i = 1; i < nums.Length; i++)
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{
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rslt ^= nums[i];
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}
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return rslt;
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}
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#endregion
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}
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}

‎HashTable/HashTable.Lib/TwoSumSln.cs

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/* ==============================================================================
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* 功能描述：TwoSum
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* 创 建 者：gz
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* 创建日期：2017/4/28 18:20:39
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* ==============================================================================*/
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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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namespace HashTable.Lib
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{
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//Given an array of integers, return indices of the two numbers such that they add up to a specific target.
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//You may assume that each input would have exactly one solution, and you may not use the same element twice.
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/// <summary>
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/// TwoSum
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/// </summary>
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public class TwoSumSln
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{
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#region 公有方法
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public int[] TwoSum1(int[] nums, int target)
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{
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Dictionary<int, int> dict = new Dictionary<int, int>();
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for (int i = 0; i < nums.Length; i++)
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{
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if (dict.ContainsKey(target - nums[i]))
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return new int[] { dict[target - nums[i]], i };
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else
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{
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if (!dict.ContainsKey(nums[i])) //同一个元素不能用两次
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dict.Add(nums[i], i);
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}
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}
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return null;
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}
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//暴力版本
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public int[] TwoSum2(int[] nums, int target)
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{
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for (int i = 0; i < nums.Length; i++)
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{
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for (int j = i + 1; j < nums.Length; j++)
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{
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if (nums[i] + nums[j] == target)
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return new int[] { i, j };
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}
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}
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return null;
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}
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#endregion
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}
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}

‎HashTable/HashTable.sln

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Microsoft Visual Studio Solution File, Format Version 11.00
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# Visual Studio 2010
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HashTable", "HashTable\HashTable.csproj", "{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HashTable.Lib", "HashTable.Lib\HashTable.Lib.csproj", "{2DAA0642-6344-4AAA-A001-A72C0E416B99}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Debug|Mixed Platforms = Debug|Mixed Platforms
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Debug|x86 = Debug|x86
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Release|Any CPU = Release|Any CPU
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Release|Mixed Platforms = Release|Mixed Platforms
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Debug|Any CPU.ActiveCfg = Debug|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Debug|Mixed Platforms.ActiveCfg = Debug|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Debug|Mixed Platforms.Build.0 = Debug|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Debug|x86.ActiveCfg = Debug|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Debug|x86.Build.0 = Debug|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Release|Any CPU.ActiveCfg = Release|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Release|Mixed Platforms.ActiveCfg = Release|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Release|Mixed Platforms.Build.0 = Release|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Release|x86.ActiveCfg = Release|x86
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{FE7A16ED-A5A1-40D0-A2C6-D690473A6D39}.Release|x86.Build.0 = Release|x86
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{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Debug|Any CPU.Build.0 = Debug|Any CPU
30+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
31+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
32+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Debug|x86.ActiveCfg = Debug|Any CPU
33+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Release|Any CPU.ActiveCfg = Release|Any CPU
34+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Release|Any CPU.Build.0 = Release|Any CPU
35+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
36+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Release|Mixed Platforms.Build.0 = Release|Any CPU
37+
{2DAA0642-6344-4AAA-A001-A72C0E416B99}.Release|x86.ActiveCfg = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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EndGlobal

‎HashTable/HashTable.suo

26.5 KB
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