diff --git a/P001-Two-Sum/P001-Two-Sum.sln b/P001-Two-Sum/P001-Two-Sum.sln
new file mode 100644
index 0000000..f9235ce
--- /dev/null
+++ b/P001-Two-Sum/P001-Two-Sum.sln
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "P001-Two-Sum", "P001-Two-Sum\P001-Two-Sum.csproj", "{8A6E51C4-65F7-4F48-A959-2C10EF8F918F}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {8A6E51C4-65F7-4F48-A959-2C10EF8F918F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {8A6E51C4-65F7-4F48-A959-2C10EF8F918F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {8A6E51C4-65F7-4F48-A959-2C10EF8F918F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {8A6E51C4-65F7-4F48-A959-2C10EF8F918F}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+EndGlobal
diff --git a/P001-Two-Sum/P001-Two-Sum/App.config b/P001-Two-Sum/P001-Two-Sum/App.config
new file mode 100644
index 0000000..88fa402
--- /dev/null
+++ b/P001-Two-Sum/P001-Two-Sum/App.config
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/P001-Two-Sum/P001-Two-Sum/P001-Two-Sum.csproj b/P001-Two-Sum/P001-Two-Sum/P001-Two-Sum.csproj
new file mode 100644
index 0000000..ecb5044
--- /dev/null
+++ b/P001-Two-Sum/P001-Two-Sum/P001-Two-Sum.csproj
@@ -0,0 +1,61 @@
+
+
+
+
+ Debug
+ AnyCPU
+ {8A6E51C4-65F7-4F48-A959-2C10EF8F918F}
+ Exe
+ Properties
+ P001_Two_Sum
+ P001-Two-Sum
+ v4.5.2
+ 512
+ true
+
+
+ AnyCPU
+ true
+ full
+ false
+ bin\Debug\
+ DEBUG;TRACE
+ prompt
+ 4
+
+
+ AnyCPU
+ pdbonly
+ true
+ bin\Release\
+ TRACE
+ prompt
+ 4
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/P001-Two-Sum/P001-Two-Sum/Program.cs b/P001-Two-Sum/P001-Two-Sum/Program.cs
new file mode 100644
index 0000000..8209cc2
--- /dev/null
+++ b/P001-Two-Sum/P001-Two-Sum/Program.cs
@@ -0,0 +1,15 @@
+using System;
+
+namespace P001_Two_Sum
+{
+ class Program
+ {
+ static void Main(string[] args)
+ {
+ Solution solution = new Solution();
+ int[] result = solution.TwoSum(new int[] { 2, 7, 11, 15 }, 9);
+ Console.WriteLine("Result: [{0}], Expected: [{1}]", string.Join(", ", result), "0, 1");
+ Console.ReadLine();
+ }
+ }
+}
diff --git a/P001-Two-Sum/P001-Two-Sum/Properties/AssemblyInfo.cs b/P001-Two-Sum/P001-Two-Sum/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..dfcf8bb
--- /dev/null
+++ b/P001-Two-Sum/P001-Two-Sum/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("P001-Two-Sum")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Xeon Productions")]
+[assembly: AssemblyProduct("P001-Two-Sum")]
+[assembly: AssemblyCopyright("Copyright © Xeon Productions 2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components. If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("8a6e51c4-65f7-4f48-a959-2c10ef8f918f")]
+
+// Version information for an assembly consists of the following four values:
+//
+// Major Version
+// Minor Version
+// Build Number
+// Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/P001-Two-Sum/P001-Two-Sum/Solution.cs b/P001-Two-Sum/P001-Two-Sum/Solution.cs
new file mode 100644
index 0000000..9d16d4a
--- /dev/null
+++ b/P001-Two-Sum/P001-Two-Sum/Solution.cs
@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace P001_Two_Sum
+{
+ public class Solution
+ {
+ /*
+ * 19 / 19 test cases passed.
+ * Status: Accepted.
+ * Runtime: 715 ms
+ */
+ public int[] TwoSum(int[] nums, int target)
+ {
+ for (int i = 0; i < nums.Length; i++)
+ for (int j = 0; j < nums.Length; j++)
+ if (j != i && nums[i] + nums[j] == target)
+ return new int[] { i, j };
+ return null;
+ }
+ }
+}