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copied!<p>my effort was as follows trying to eliminate unnecessary string compares, i read isaacs blog but it is in c how would this translate to c#, i even went as far as using arrays everywhere to avoid the string immutability factor but there was no improvement</p> <pre><code> int Rtn = 0; int len = S.Length; if (len > 1000000000) return 1000000000; for (int i = 1; i <= len; i++) { string tofind = S.Substring(0, i); int tofindlen = tofind.Length; int occurencies = 0; for (int ii = 0; ii < len; ii++) { int found = FastIndexOf(S, tofind.ToCharArray(), ii); if (found != -1) { if ((found == 0 && tofindlen != 1) || (found >= 0)) { ii = found; } ++occurencies ; } } if (occurencies > 0) { int total = occurencies * tofindlen; if (total > Rtn) { Rtn = total; } } } return Rtn; } static int FastIndexOf(string source, char[] pattern, int start) { if (pattern.Length == 0) return 0; if (pattern.Length == 1) return source.IndexOf(pattern[0], start); bool found; int limit = source.Length - pattern.Length + 1 - start; if (limit < 1) return -1; char c0 = pattern[0]; char c1 = pattern[1]; // Find the first occurrence of the first character int first = source.IndexOf(c0, start, limit); while ((first != -1) && (first + pattern.Length <= source.Length)) { if (source[first + 1] != c1) { first = source.IndexOf(c0, ++first); continue; } found = true; for (int j = 2; j < pattern.Length; j++) if (source[first + j] != pattern[j]) { found = false; break; } if (found) return first; first = source.IndexOf(c0, ++first); } return -1; } </code></pre>

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