Create IsPalindrome.cs

IsPalindrome.cs

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+// IsPalindrome - tests if a string is an anagram of a palindrome
+//Rextester.Program.Main is the entry point for your code. Don't change it.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace Rextester
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            //Your code goes here
+            Console.WriteLine(IsPalindrome("ssdddd"));
+            Console.WriteLine(IsPalindrome("anav"));
+            Console.WriteLine(IsPalindrome("A new order began a more Roman age bred Rowena"));
+            Console.WriteLine(IsPalindrome("Aerate pet area"));
+            Console.WriteLine(IsPalindrome("Anne I vote more cars race Rome to Vienna"));
+            Console.WriteLine(IsPalindrome(null));
+            Console.WriteLine(IsPalindrome("aaxxccjjjhhh"));
+            Console.WriteLine(IsPalindrome("alula"));
+            Console.WriteLine(IsPalindrome("A tin mug for a jar of gum Nita"));
+        }
+
+        static bool IsPalindrome(string s)
+        {
+            if (s == null || s.Length == 0) return false;
+
+            var d = new Dictionary<char, int>();
+            for (int i = 0; i < s.Length; i++)
+            {
+               // ignore case 
+               var ch = char.ToLower(s[i]);
+
+                // ignore spaces
+               if (ch == ' ') continue;
+
+               // count occurances of each char 
+               if (d.ContainsKey(ch))
+               {
+                  d[ch] = ++d[ch];   
+               }
+               else
+               {
+                   d.Add(ch, 1);
+               }
+
+            }
+
+            //foreach (var pair in d)
+          //{
+	        //  Console.WriteLine("{0}, {1}",
+		    //  pair.Key,
+		    //  pair.Value);
+	        //}
+
+            int oddCounter = 0;
+            foreach (var c in d.Values)
+            {
+              if (c % 2 != 0)
+              {
+                if (oddCounter == 0)
+                {
+                   oddCounter++;   
+                }
+                else
+                {
+                   return false;  
+                }
+              }
+            }
+
+            return true;
+        }
+    }
+}