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POLongest common substring constrained by pattern
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  1. POLongest common substring constrained by pattern
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    copied!<h3>Problem:</h3> <p>I have 3 strings s1, s2, s3. Each contain garbage text on either side, with a defining pattern in its centre: <code>text1+number1</code>. <code>number1</code> increases by 2 in each string. I want to extract <code>text1+number1</code>.</p> <p>I have already written code to find <code>number1</code></p> <p><strong>How would I extend an LCS function to get text1?</strong></p> <pre><code>#include &lt;iostream&gt; const std::string longestCommonSubstring(int, std::string const&amp; s1, std::string const&amp; s2, std::string const&amp; s3); int main(void) { std::string s1="hello 5", s2="bolo 7", s3="lo 9sdf"; std::cout &lt;&lt; "Trying to get \"lo 5\", actual result: \"" &lt;&lt; longestCommonSubstring(5, s1, s2, s3) &lt;&lt; '\"'; } const std::string longestCommonSubstring(int must_include, std::string const&amp; s1, std::string const&amp; s2, std::string const&amp; s3) { std::string longest; for(size_t start=0, length=1; start + length &lt;= s1.size();) { std::string tmp = s1.substr(start, length); if (std::string::npos != s2.find(tmp) &amp;&amp; std::string::npos != s3.find(tmp)) { tmp.swap(longest); ++length; } else ++start; } return longest; } </code></pre> <hr> <h3>Example:</h3> <p>From <code>"hello 5"</code>, <code>"bolo 7"</code>, <code>"lo 9sdf"</code> I would like to get <code>"lo 5"</code></p> <h3>Code:</h3> <p>I have been able to write a simple LCS function(<a href="http://ideone.com/aD7tD" rel="nofollow">test-case</a>) but I am having trouble writing this modified one.</p>
 

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