Data update

Task/Rep-string/C-sharp/rep-string.cs

@@ -0,0 +1,40 @@
+using System;
+
+public class RepString
+{
+    static readonly string[] input = {"1001110011", "1110111011", "0010010010",
+        "1010101010", "1111111111", "0100101101", "0100100", "101", "11",
+        "00", "1", "0100101"};
+
+    public static void Main(string[] args)
+    {
+        foreach (string s in input)
+            Console.WriteLine($"{s} : {repString(s)}");
+    }
+
+    static string repString(string s)
+    {
+        int len = s.Length;
+        for (int part = len / 2; part > 0; part--)
+        {
+            int tail = len % part;
+            if (tail > 0 && !s.Substring(0, tail).Equals(s.Substring(len - tail)))
+                continue;
+            bool isRepeated = true;
+            for (int j = 0; j < len / part - 1; j++)
+            {
+                int a = j * part;
+                int b = (j + 1) * part;
+                int c = (j + 2) * part;
+                if (!s.Substring(a, part).Equals(s.Substring(b, part)))
+                {
+                    isRepeated = false;
+                    break;
+                }
+            }
+            if (isRepeated)
+                return s.Substring(0, part);
+        }
+        return "none";
+    }
+}