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<div class="headertitle"><div class="title">knuth_morris_pratt.cpp File Reference</div></div>
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<p>The <a href="https://en.wikipedia.org/wiki/Knuth–Morris–Pratt_algorithm" target="_blank">Knuth-Morris-Pratt Algorithm</a> for finding a pattern within a piece of text with complexity O(n + m)
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;string&gt;</code><br />
<code>#include &lt;vector&gt;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for knuth_morris_pratt.cpp:</div>
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Namespaces</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/d03/namespacestring__search.html">string_search</a></td></tr>
<tr class="memdesc:d9/d03/namespacestring__search"><td class="mdescLeft">&#160;</td><td class="mdescRight">String search algorithms. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a83c72ff237cdf623e42d4295e0029bf9" id="r_a83c72ff237cdf623e42d4295e0029bf9"><td class="memItemLeft" align="right" valign="top"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; size_t &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/d03/namespacestring__search.html#a83c72ff237cdf623e42d4295e0029bf9">string_search::getFailureArray</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;pattern)</td></tr>
<tr class="memdesc:a83c72ff237cdf623e42d4295e0029bf9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate the partial match table aka failure function for a pattern to search. <br /></td></tr>
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<tr class="memitem:a1e37af2f023495129cb57338c801209e" id="r_a1e37af2f023495129cb57338c801209e"><td class="memItemLeft" align="right" valign="top">size_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/d03/namespacestring__search.html#a1e37af2f023495129cb57338c801209e">string_search::kmp</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;pattern, const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;text)</td></tr>
<tr class="memdesc:a1e37af2f023495129cb57338c801209e"><td class="mdescLeft">&#160;</td><td class="mdescRight">KMP algorithm to find a pattern in a text. <br /></td></tr>
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<tr class="memitem:a483bb8ccf42aaf7375a83e91490eda1e" id="r_a483bb8ccf42aaf7375a83e91490eda1e"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a483bb8ccf42aaf7375a83e91490eda1e">tests</a> ()</td></tr>
<tr class="memdesc:a483bb8ccf42aaf7375a83e91490eda1e"><td class="mdescLeft">&#160;</td><td class="mdescRight">self-test implementations <br /></td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4" id="r_ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The <a href="https://en.wikipedia.org/wiki/Knuth–Morris–Pratt_algorithm" target="_blank">Knuth-Morris-Pratt Algorithm</a> for finding a pattern within a piece of text with complexity O(n + m) </p>
<ol type="1">
<li>Preprocess pattern to identify any suffixes that are identical to prefixes. This tells us where to continue from if we get a mismatch between a character in our pattern and the text.</li>
<li>Step through the text one character at a time and compare it to a character in the pattern updating our location within the pattern if necessary <dl class="section author"><dt>Author</dt><dd><a href="https://github.com/Yancey2023" target="_blank">Yancey</a> </dd></dl>
</li>
</ol>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
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<td class="paramtype">void</td> <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
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<div class="fragment"><div class="line"><span class="lineno"> 95</span> {</div>
<div class="line"><span class="lineno"> 96</span> <a class="code hl_function" href="#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>();</div>
<div class="line"><span class="lineno"> 97</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 98</span>}</div>
<div class="ttc" id="aknuth__morris__pratt_8cpp_html_a483bb8ccf42aaf7375a83e91490eda1e"><div class="ttname"><a href="#a483bb8ccf42aaf7375a83e91490eda1e">tests</a></div><div class="ttdeci">static void tests()</div><div class="ttdoc">self-test implementations</div><div class="ttdef"><b>Definition</b> knuth_morris_pratt.cpp:79</div></div>
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<a id="a483bb8ccf42aaf7375a83e91490eda1e" name="a483bb8ccf42aaf7375a83e91490eda1e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a483bb8ccf42aaf7375a83e91490eda1e">&#9670;&#160;</a></span>tests()</h2>
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<td class="memname">static void tests </td>
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<p>self-test implementations </p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 79</span> {</div>
<div class="line"><span class="lineno"> 80</span> assert(kmp(<span class="stringliteral">&quot;abc1abc12l&quot;</span>, <span class="stringliteral">&quot;alskfjaldsabc1abc1abc12k2&quot;</span>) == std::string::npos);</div>
<div class="line"><span class="lineno"> 81</span> assert(kmp(<span class="stringliteral">&quot;bca&quot;</span>, <span class="stringliteral">&quot;abcabc&quot;</span>) == 1);</div>
<div class="line"><span class="lineno"> 82</span> assert(kmp(<span class="stringliteral">&quot;World&quot;</span>, <span class="stringliteral">&quot;helloWorld&quot;</span>) == 5);</div>
<div class="line"><span class="lineno"> 83</span> assert(kmp(<span class="stringliteral">&quot;c++&quot;</span>, <span class="stringliteral">&quot;his_is_c++&quot;</span>) == 7);</div>
<div class="line"><span class="lineno"> 84</span> assert(kmp(<span class="stringliteral">&quot;happy&quot;</span>, <span class="stringliteral">&quot;happy_coding&quot;</span>) == 0);</div>
<div class="line"><span class="lineno"> 85</span> assert(kmp(<span class="stringliteral">&quot;&quot;</span>, <span class="stringliteral">&quot;pattern is empty&quot;</span>) == 0);</div>
<div class="line"><span class="lineno"> 86</span> </div>
<div class="line"><span class="lineno"> 87</span> <span class="comment">// this lets the user know that the tests have passed</span></div>
<div class="line"><span class="lineno"> 88</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;All KMP algorithm tests have successfully passed!\n&quot;</span>;</div>
<div class="line"><span class="lineno"> 89</span>}</div>
<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div></div>
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