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POOptimize this code for large input
 

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  1. POOptimize this code for large input
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    <p>i have this solution that works for smaller inputs say an input string of length up to 350,beyond that it gives runtime error.input constraint is 0 &lt; input&lt;500 .</p> <p>this problem is from <a href="https://www.hackerrank.com/contests/quantium/challenges/k-mismatch" rel="nofollow">https://www.hackerrank.com/contests/quantium/challenges/k-mismatch</a></p> <p>how can i optimize this code to handle strings up to length 500?</p> <p>Language c#</p> <pre><code> using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; class Solution { static int mismatch(string a, string b) { int result = 0; for (int i = 0; i &lt; a.Length; i++) if (a[i] != b[i]) result++; return result; } static void Main(string[] args) { long no = 0; int K = int.Parse(Console.ReadLine()); string word = Console.ReadLine(); List&lt;string&gt; wordList = new List&lt;string&gt;(); List&lt;string&gt; curr = new List&lt;string&gt;(); var query = from i in Enumerable.Range(0, word.Length) from j in Enumerable.Range(0, word.Length - i + 1) where j &gt;= 1 select word.Substring(i, j); for (int i = 1; i &lt; word.Length; i++) { foreach (string s in query) { if (s.ToString().Length == i)curr.Add(s); } if (curr.Count() &gt; 1) for (int j = 0; j &lt; curr.Count(); j++) for (int k = j + 1; k &lt; curr.Count(); k++) if (mismatch(curr.ElementAt(j).ToString(), curr.ElementAt(k).ToString()) &lt;= K) no++; curr.Clear(); } Console.WriteLine(word.Length+":"+no); } } </code></pre>
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    1. USRakon_188
    1. USRakon_188
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    1. COI could be wrong, but I don't think SO likes "review my code for me" questions because it is tailored to _your_ code, and is unlikely to help others in the future. You might find more luck at codereview.stackexchange.com
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      1. USgunr2171
    2. COI don't know if this will help, but looking into a suffix tree might help? [k match with suffix tree](http://arxiv.org/pdf/1307.1406.pdf) ior [this](http://www.rosshemsley.co.uk/tag/k-mismatches/)
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      1. USjrbeverly
    3. COWhat runtime error does it give?
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      1. USJim Mischel
 

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