[Hacker Rank] Interview Preparation Kit: Miscellaneous: Flipping bits. Solved ✓.

Author: Gonzalo Diaz

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

@@ -3,28 +3,29 @@
 namespace algorithm_exercises_csharp.hackerrank.interview_preparation_kit.miscellaneous;
 
 using System.Diagnostics.CodeAnalysis;
+using System.Text;
 
 public static class FlippingBits
 {
   public static long flippingBits(long n)
   {
     string n_bin_str = Convert.ToString(n, 2);
     n_bin_str = n_bin_str.PadLeft(32, '0'); // Ensure 32 bits
-    string result_bin_str = "";
+    StringBuilder result_bin_str = new StringBuilder();
 
     foreach (char bin_digit in n_bin_str)
     {
       if (bin_digit == '1')
       {
-        result_bin_str = result_bin_str + '0';
+        result_bin_str.Append('0');
       }
       else
       {
-        result_bin_str = result_bin_str + '1';
+        result_bin_str.Append('1');
       }
     }
 
-    long number = Convert.ToUInt32(result_bin_str, 2);
+    long number = Convert.ToUInt32(result_bin_str.ToString(), 2);
 
     return number;
   }