Initial Commit

.gitignore

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+/bin/Debug/*
+*.exe
+
+*.mdb

ArrayJump.sln

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+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ArrayJump", "ArrayJump\ArrayJump.csproj", "{CE6A6B77-EE1B-4285-9969-CC53DA893773}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x86 = Debug|x86
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CE6A6B77-EE1B-4285-9969-CC53DA893773}.Debug|x86.ActiveCfg = Debug|x86
+		{CE6A6B77-EE1B-4285-9969-CC53DA893773}.Debug|x86.Build.0 = Debug|x86
+		{CE6A6B77-EE1B-4285-9969-CC53DA893773}.Release|x86.ActiveCfg = Release|x86
+		{CE6A6B77-EE1B-4285-9969-CC53DA893773}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(MonoDevelopProperties) = preSolution
+		StartupItem = ArrayJump\ArrayJump.csproj
+	EndGlobalSection
+EndGlobal

ArrayJump.userprefs

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+<Properties>
+  <MonoDevelop.Ide.Workspace ActiveConfiguration="Debug|x86" />
+  <MonoDevelop.Ide.Workbench ActiveDocument="ArrayJump/Problem.txt">
+    <Files>
+      <File FileName="ArrayJump/Main.cs" Line="1" Column="1" />
+      <File FileName="ArrayJump/Problem.txt" Line="7" Column="33" />
+    </Files>
+    <Pads>
+      <Pad Id="ProjectPad">
+        <State expanded="True">
+          <Node name="ArrayJump" expanded="True">
+            <Node name="Problem.txt" selected="True" />
+          </Node>
+        </State>
+      </Pad>
+      <Pad Id="ClassPad">
+        <State expanded="True" selected="True" />
+      </Pad>
+      <Pad Id="MonoDevelop.Debugger.WatchPad">
+        <State />
+      </Pad>
+      <Pad Id="ConnectionManagerPad">
+        <State selected="True" />
+      </Pad>
+    </Pads>
+  </MonoDevelop.Ide.Workbench>
+  <MonoDevelop.Ide.DebuggingService.Breakpoints>
+    <BreakpointStore />
+  </MonoDevelop.Ide.DebuggingService.Breakpoints>
+  <MonoDevelop.Ide.DebuggingService.PinnedWatches />
+</Properties>

ArrayJump/ArrayJump.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProductVersion>10.0.0</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{CE6A6B77-EE1B-4285-9969-CC53DA893773}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>ArrayJump</RootNamespace>
+    <AssemblyName>ArrayJump</AssemblyName>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+    <DebugSymbols>True</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>False</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <PlatformTarget>x86</PlatformTarget>
+    <Externalconsole>True</Externalconsole>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+    <DebugType>none</DebugType>
+    <Optimize>True</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <PlatformTarget>x86</PlatformTarget>
+    <Externalconsole>True</Externalconsole>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Main.cs" />
+    <Compile Include="AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+  <ItemGroup>
+    <None Include="Problem.txt" />
+  </ItemGroup>
+</Project>

ArrayJump/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+// Information about this assembly is defined by the following attributes. 
+// Change them to the values specific to your project.
+
+[assembly: AssemblyTitle("ArrayJump")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("zhaowang")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
+// The form "{Major}.{Minor}.*" will automatically update the build and revision,
+// and "{Major}.{Minor}.{Build}.*" will update just the revision.
+
+[assembly: AssemblyVersion("1.0.*")]
+
+// The following attributes are used to specify the signing key for the assembly, 
+// if desired. See the Mono documentation for more information about signing.
+
+//[assembly: AssemblyDelaySign(false)]
+//[assembly: AssemblyKeyFile("")]
+

ArrayJump/Main.cs

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+using System;
+using System.Collections.Generic;
+namespace ArrayJump
+{
+	class MainClass
+	{
+		static void Main(string[] args)
+		{
+			//int[] array = new int[] { 2, 3, -1, 1, 3 }; //4
+			//int[] array = new int[] { -1 };  //1
+			//int[] array = new int[] { 0 }; //-1
+			//int[] array = new int[] { 1, 1, -1, 1 }; //-1
+			//int[] array = new int[] { 1, 1, 1, 1 }; //4
+			//int[] array = new int[] { 1, 1, 3, 1 }; //3
+			int[] array = new int[] { -3 };  //1
+			int result = arrayJmpHareAndTortoise(array);
+			Console.WriteLine(result);
+
+
+			Console.WriteLine("Done. Press any key to continue");
+			Console.ReadKey();
+		}
+
+		/// <summary>
+		/// Use Set
+		/// </summary>
+		/// <param name="A"></param>
+		/// <returns></returns>
+		static int arrayJmpWithSet(int[] A)
+		{
+			if (A.Length == 0) return -1;
+			HashSet<int> set = new HashSet<int>();
+			int nextJump = A[0];
+			set.Add(0);
+			while (nextJump >= 0 && nextJump < A.Length)
+			{
+				if (set.Contains(nextJump))
+				{
+					return -1;
+				}
+				set.Add(nextJump);
+				nextJump = A[nextJump] + nextJump;
+			}
+			return set.Count;
+		}
+
+		/// <summary>
+		/// Use no additional data structure.
+		/// </summary>
+		/// <param name="A"></param>
+		/// <returns></returns>
+		static int arrayJmp(int[] A)
+		{
+			if (A.Length == 0) return -1;
+			int nextJump = A[0];
+			int count = 1;
+			while (nextJump >= 0 && nextJump < A.Length)
+			{
+				if (A[nextJump] == int.MinValue)
+				{
+					return -1;
+				}
+				count++;
+				int currentIndex = nextJump;
+				nextJump = A[nextJump] + nextJump;
+				A[currentIndex] = int.MinValue;
+			}
+			return count;
+		}
+
+		static int arrayJmpWithString(int[] A)
+		{
+			if (A.Length == 0) return -1;
+			int nextJump = A[0];
+			int count = 1;
+			string result = ",0";
+			while (nextJump >= 0 && nextJump < A.Length)
+			{
+				string temp = nextJump + ",";
+				if (result.IndexOf(temp) >= 0)
+				{
+					return -1;
+				}
+				count++;
+				result += temp;
+				nextJump = A[nextJump] + nextJump;
+			}
+			return count;
+		}
+
+		static int arrayJmpNoTracking(int[] A)
+		{
+			if (A.Length == 0) return -1;
+			int nextJump = A[0];
+			int count = 1;
+			while (nextJump >= 0 && nextJump < A.Length)
+			{
+				if (count > A.Length)
+				{
+					return -1;
+				}
+				count++;
+				nextJump = A[nextJump] + nextJump;
+			}
+			return count;
+		}
+
+		static int arrayJmpHareAndTortoise(int[] A)
+		{
+			if (A.Length == 0) return -1;
+			int nextJumpTor = A[0];
+			int nextJumpHare = A[0];
+			int count = 1;
+			if (IsInRangeofArray(A, nextJumpHare))
+			{
+				nextJumpHare = A[nextJumpHare] + nextJumpHare;
+				count++;
+			}
+			while (IsInRangeofArray(A, nextJumpHare))
+			{
+				if (nextJumpHare == nextJumpTor)
+				{
+					return -1;
+				}
+				nextJumpTor = A[nextJumpTor] + nextJumpTor;
+				nextJumpHare = A[nextJumpHare] + nextJumpHare;
+				count++;
+				if (IsInRangeofArray(A, nextJumpHare))
+				{
+					nextJumpHare = A[nextJumpHare] + nextJumpHare;
+					count++;
+				}
+			}
+			return count;
+		}
+
+		static bool IsInRangeofArray(int[] A, int nextJumpHare)
+		{
+			return nextJumpHare >= 0 && nextJumpHare < A.Length;
+		}
+	}
+}

ArrayJump/Problem.txt

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+Given an int array, the value in each element note the next index to jump. 
+Start from 0, calculate the number of jumps need to jump out of the array
+
+For example {-1} will return 1 jump
+{2,3,5,2} will require two jump from 0->2->5(out of array)
+
+This is a test from codility.com