diff --git a/Codeforces.Test/IOTester.cs b/Codeforces.Test/IOTester.cs
index 68a0ebb..5834108 100644
--- a/Codeforces.Test/IOTester.cs
+++ b/Codeforces.Test/IOTester.cs
@@ -1,11 +1,8 @@
 namespace Codeforces.Test
 {
-    public class IOTester
+	public class IOTester
 	{
-		private static readonly TextReader originalStdIn = Console.In;
 		private static StringReader? stdIn;
-
-		private static readonly TextWriter originalStdOut = Console.Out;
 		private static StringWriter? stdOut;
 
 		public static void Start()
@@ -14,14 +11,6 @@ namespace Codeforces.Test
 			Console.SetOut(stdOut);
 		}
 
-		public static void End()
-		{
-			stdOut = null;
-			stdIn = null;
-			Console.SetOut(originalStdOut);
-			Console.SetIn(originalStdIn);
-		}
-
 		public static void SetInput(params string[] lines)
 		{
 			string input = string.Join(Environment.NewLine, lines);
@@ -29,26 +18,12 @@ namespace Codeforces.Test
 			Console.SetIn(stdIn);
 		}
 
-		public static string GetOutput()
+		public static IEnumerable<string> GetOutputLines()
 		{
-			if (stdOut == null)
-			{
-				return string.Empty;
-			}
-			else
-			{
-				return stdOut.ToString();
-			}
-		}
-
-		public static string[] GetOutputLines()
-		{
-			return GetOutput().Split(Environment.NewLine).SkipLast(1).ToArray();
-		}
-
-		public static IList<string> GetOutputLinesAsList()
-		{
-			return new List<string>(GetOutputLines());
+			return stdOut?.ToString()
+				.Split(Environment.NewLine)
+				.SkipLast(1)
+				?? Enumerable.Empty<string>();
 		}
 	}
 }
\ No newline at end of file
diff --git a/Codeforces.Test/Tests.cs b/Codeforces.Test/Tests.cs
index a719b3b..f45b503 100644
--- a/Codeforces.Test/Tests.cs
+++ b/Codeforces.Test/Tests.cs
@@ -8,32 +8,28 @@ public class Tests
 	public void TestText()
 	{
 		IOTester.Start();
-		string[] input = new[]
-		{
-			"5",
+		string[] input =
+        [
+            "5",
 			"256 42",
 			"1000 1000",
 			"-1000 1000",
 			"-1000 1000",
 			"20 22"
-		};
+		];
 
 		IOTester.SetInput(input);
 		Program.Main();
-		string[] expectedOutput = new[]
-		{
-			"298",
+		string[] expected =
+        [
+            "298",
 			"2000",
 			"0",
 			"0",
 			"42"
-		};
-		string[] actualOutput = IOTester.GetOutputLines();
-		Assert.Equal(expectedOutput.Length, actualOutput.Length);
-		for (int i = 0; i < expectedOutput.Length; i++)
-		{
-			Assert.Equal(expectedOutput[i], actualOutput[i]);
-		}
+		];
+		string[] actual = IOTester.GetOutputLines().ToArray();
+		Assert.Equal(expected, actual);
 	}
 
 	[Theory]
@@ -46,13 +42,9 @@ public class Tests
 
 		Program.Main();
 
-		string[] expectedOutput = File.ReadLines(output).ToArray();
-		string[] actualOutput = IOTester.GetOutputLines();
-		Assert.Equal(expectedOutput.Length, actualOutput.Length);
-		for (int i = 0; i < expectedOutput.Length; i++)
-		{
-			Assert.Equal(expectedOutput[i], actualOutput[i]);
-		}
+		var expectedOutput = File.ReadLines(output);
+		var actualOutput = IOTester.GetOutputLines();
+		Assert.Equal(expectedOutput, actualOutput);
 	}
 }
 public class FileNameGenerator : IEnumerable<object[]>