Shortest super string of a string

Author: sharyash81

Algorithms on String/Algortihmic challenges of String Processing/shortestSuperstring.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using TestCommon;
+
+namespace E1
+{
+    public class Q3LeastLengthString : Processor
+    {
+        public Q3LeastLengthString(string testDataName) : base(testDataName)
+        {
+            this.VerifyResultWithoutOrder = true;
+        }
+
+        public override string Process(string inStr) =>
+        E1Processors.ProcessQ3FindAllOccur(inStr, Solve);
+
+        public long Solve(string text, long k)
+        {
+            long totallenght = 0;
+            long n = ComputePrefixFunction(text);
+            return k * text.Length - (k - 1) * n;
+        }
+        public long ComputePrefixFunction(string P)
+        {
+            int n = P.Length;
+            long[] s = new long[n];
+            s[0] = 0;
+            long border = 0;
+            for (int i = 1; i < n; i++)
+            {
+                while (border > 0 && P[i] != P[(int)border])
+                {
+                    border = s[border - 1];
+                }
+                if (P[i] == P[(int)border]) border++;
+                else border = 0;
+                s[i] = border;
+            }
+            return s[n - 1];
+        }
+    }
+}