[Hacker Rank] Interview Preparation Kit: Miscellaneous: Flipping bits…

src/algorithm_exercises_csharp/hackerrank/interview_preparation_kit/miscellaneous/FlippingBitsAlternative.cs

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+// @link Problem definition [[docs/hackerrank/interview_preparation_kit/miscellaneous/flipping-bits.md]]
+
+namespace algorithm_exercises_csharp.hackerrank.interview_preparation_kit.miscellaneous;
+
+using System.Diagnostics.CodeAnalysis;
+using System.Text;
+
+public static class FlippingBitsAlternative
+{
+  public static long flippingBits(long n)
+  {
+    return ~n & 0xFFFFFFFF; // Use bitwise NOT and mask to ensure 32 bits
+  }
+}

src/algorithm_exercises_csharp_test/hackerrank/interview_preparation_kit/miscellaneous/FlippingBitsAlternative.Test.cs

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+namespace algorithm_exercises_csharp_test.hackerrank.interview_preparation_kit.miscellaneous;
+
+using algorithm_exercises_csharp_test.common;
+using algorithm_exercises_csharp.hackerrank.interview_preparation_kit.miscellaneous;
+
+[TestClass]
+public class FlippingBitsAlternativeTest
+{
+  public class FlippingBitsAlternativeTestCaseTest(long input, long answer)
+  {
+    public long Input { get; } = input;
+    public long Answer { get; } = answer;
+  }
+
+  public class FlippingBitsAlternativeTestCase(string title, List<FlippingBitsAlternativeTestCaseTest> tests)
+  {
+    public string Title { get; } = title;
+    public List<FlippingBitsAlternativeTestCaseTest> Tests { get; } = tests;
+  }
+
+  private List<FlippingBitsAlternativeTestCase> testCases { get; set; } = default!;
+
+  [TestInitialize]
+  public void testInitialize()
+  {
+    testCases = JsonLoader.resourceLoad<List<FlippingBitsAlternativeTestCase>>(
+      "hackerrank/interview_preparation_kit/miscellaneous/flipping_bits.testcases.json"
+    ) ?? [];
+  }
+
+  [TestMethod]
+  public void testFlippingBitsAlternative()
+  {
+    long result;
+
+    foreach (FlippingBitsAlternativeTestCase tests in testCases)
+    {
+      foreach (FlippingBitsAlternativeTestCaseTest test in tests.Tests)
+      {
+        result = FlippingBitsAlternative.flippingBits(test.Input);
+        Assert.AreEqual(
+          test.Answer,
+          result,
+          string.Format(
+            System.Globalization.CultureInfo.InvariantCulture,
+            "FlippingBitsAlternative.flippingBits({0}) => must be: {1}",
+            test.Input,
+            test.Answer
+          )
+        );
+      }
+    }
+  }
+}