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POC# Char permutation with repetition on large set of chars
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  1. POC# Char permutation with repetition on large set of chars
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    copied!<p>Hello Im trying to get all possible combinations with repetitions of given char array. Char array consists of alphabet letters(only lower) and I need to generate strings with length of 30 or more chars.</p> <p>I tried with method of many for-loops,but when I try to get all combinations of char in char array with length of string more then 5 I get out of Memory Exception.</p> <p>So I created similar Method that takes only first 200000 strings,then next 2000000 and so on this was proven sucessfull but only with smaller length strings.</p> <p>This was my method with length of 7 chars:</p> <pre><code>public static int Progress = 0; public static ArrayList CreateRngUrl7() { ArrayList AllCombos = new ArrayList(); int passed = 0; int Too = Progress + 200000; char[] alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToLower().ToCharArray(); for (int i = 0; i &lt; alpha.Length; i++) for (int i1 = 0; i1 &lt; alpha.Length; i1++) for (int i2 = 0; i2 &lt; alpha.Length; i2++) for (int i3 = 0; i3 &lt; alpha.Length; i3++) for (int i4 = 0; i4 &lt; alpha.Length; i4++) for (int i5 = 0; i5 &lt; alpha.Length; i5++) for (int i6 = 0; i6 &lt; alpha.Length; i6++) { if (passed &gt; (Too - 200000) &amp;&amp; passed &lt; Too) { string word = new string(new char[] { alpha[i], alpha[i1], alpha[i2], alpha[i3], alpha[i4], alpha[i5],alpha[i6] }); AllCombos.Add(word); } passed++; } if (Too &gt;= passed) { MessageBox.Show("All combinations of RNG7 were returned"); } Progress = Too; return AllCombos; } </code></pre> <p>I tried adding 30 for-loops with in way described above so i Would get strings with lenghts of 30 but application just hangs.Is there any better way to do this? All answers would be much appreciated. Thank you in advance!</p> <p><strong>Can someone please just post method how it is done with larger legth strings I just want to see an example? I don't have to store that data,I just need to compare it with something and release it from memory. I used alphabet for example I don't need whole alphabet.Question was not how long it would take or how much combinations would it be!!!!!</strong></p>
 

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