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<p>The <a href="https://en.wikipedia.org/wiki/Rabin–Karp_algorithm" target="_blank">Rabin-Karp 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;cmath&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;cstring&gt;</code><br />
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Include dependency graph for rabin_karp.cpp:</div>
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Macros</h2></td></tr>
<tr class="memitem:ac4add2a227a10511e0128d63952030e8" id="r_ac4add2a227a10511e0128d63952030e8"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ac4add2a227a10511e0128d63952030e8">PRIME</a>&#160;&#160;&#160;5</td></tr>
<tr class="memdesc:ac4add2a227a10511e0128d63952030e8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Prime modulus for hash functions. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a8fb0bc932ba8b582c9f4c71338d050f8" id="r_a8fb0bc932ba8b582c9f4c71338d050f8"><td class="memItemLeft" align="right" valign="top">int64_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/d03/namespacestring__search.html#a8fb0bc932ba8b582c9f4c71338d050f8">string_search::create_hash</a> (const std::string &amp;s, int n)</td></tr>
<tr class="memitem:aed769d565b705a9b3e0eb1ec74088893" id="r_aed769d565b705a9b3e0eb1ec74088893"><td class="memItemLeft" align="right" valign="top">int64_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/d03/namespacestring__search.html#aed769d565b705a9b3e0eb1ec74088893">string_search::recalculate_hash</a> (const std::string &amp;s, int old_index, int new_index, int64_t old_hash, int patLength)</td></tr>
<tr class="memitem:aebe07cea289a13142503d98be7df11fd" id="r_aebe07cea289a13142503d98be7df11fd"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/d03/namespacestring__search.html#aebe07cea289a13142503d98be7df11fd">string_search::check_if_equal</a> (const std::string &amp;str1, const std::string &amp;str2, int start1, int end1, int start2, int end2)</td></tr>
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<tr class="memitem:a21c673d56cbf67b1d2ee4d869185b7d9" id="r_a21c673d56cbf67b1d2ee4d869185b7d9"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a> (const std::string &amp;str, const std::string &amp;pat)</td></tr>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The <a href="https://en.wikipedia.org/wiki/Rabin–Karp_algorithm" target="_blank">Rabin-Karp Algorithm</a> for finding a pattern within a piece of text with complexity O(n + m) </p>
<p class="definition">Definition in file <a class="el" href="../../d6/dce/rabin__karp_8cpp_source.html">rabin_karp.cpp</a>.</p>
</div><a name="doc-define-members" id="doc-define-members"></a><h2 id="header-doc-define-members" class="groupheader">Macro Definition Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ac4add2a227a10511e0128d63952030e8">&#9670;&#160;</a></span>PRIME</h2>
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<td class="memname">#define PRIME&#160;&#160;&#160;5</td>
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<p>Prime modulus for hash functions. </p>
<p class="definition">Definition at line <a class="el" href="../../d6/dce/rabin__karp_8cpp_source.html#l00016">16</a> of file <a class="el" href="../../d6/dce/rabin__karp_8cpp_source.html">rabin_karp.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a840291bc02cba5474a4cb46a9b9566fe">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
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<p>Main function </p>
<p class="definition">Definition at line <a class="el" href="../../d6/dce/rabin__karp_8cpp_source.html#l00105">105</a> of file <a class="el" href="../../d6/dce/rabin__karp_8cpp_source.html">rabin_karp.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 105</span> {</div>
<div class="line"><span class="lineno"> 106</span> assert(<a class="code hl_function" href="#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="stringliteral">&quot;helloWorld&quot;</span>, <span class="stringliteral">&quot;world&quot;</span>) == -1);</div>
<div class="line"><span class="lineno"> 107</span> assert(<a class="code hl_function" href="#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="stringliteral">&quot;helloWorld&quot;</span>, <span class="stringliteral">&quot;World&quot;</span>) == 5);</div>
<div class="line"><span class="lineno"> 108</span> assert(<a class="code hl_function" href="#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="stringliteral">&quot;this_is_c++&quot;</span>, <span class="stringliteral">&quot;c++&quot;</span>) == 8);</div>
<div class="line"><span class="lineno"> 109</span> assert(<a class="code hl_function" href="#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="stringliteral">&quot;happy_coding&quot;</span>, <span class="stringliteral">&quot;happy&quot;</span>) == 0);</div>
<div class="line"><span class="lineno"> 110</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 111</span>}</div>
<div class="ttc" id="arabin__karp_8cpp_html_a21c673d56cbf67b1d2ee4d869185b7d9"><div class="ttname"><a href="#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a></div><div class="ttdeci">int rabin_karp(const std::string &amp;str, const std::string &amp;pat)</div><div class="ttdef"><b>Definition</b> <a href="../../d6/dce/rabin__karp_8cpp_source.html#l00083">rabin_karp.cpp:83</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a21c673d56cbf67b1d2ee4d869185b7d9">&#9670;&#160;</a></span>rabin_karp()</h2>
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<td class="memname">int string_search::rabin_karp </td>
<td>(</td>
<td class="paramtype">const std::string &amp;</td> <td class="paramname"><span class="paramname"><em>str</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string &amp;</td> <td class="paramname"><span class="paramname"><em>pat</em></span>&#160;)</td>
</tr>
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</div><div class="memdoc">
<p>Perform string pattern search using Rabin-Karp algorithm </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">str</td><td>string to search in </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">pat</td><td>pattern to search for </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>index of first occurrence of pattern </dd>
<dd>
-1 if pattern not found </dd></dl>
<p class="definition">Definition at line <a class="el" href="../../d6/dce/rabin__karp_8cpp_source.html#l00083">83</a> of file <a class="el" href="../../d6/dce/rabin__karp_8cpp_source.html">rabin_karp.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 83</span> {</div>
<div class="line"><span class="lineno"> 84</span> int64_t pat_hash = <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a8fb0bc932ba8b582c9f4c71338d050f8">create_hash</a>(pat, pat.size());</div>
<div class="line"><span class="lineno"> 85</span> int64_t str_hash = <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a8fb0bc932ba8b582c9f4c71338d050f8">create_hash</a>(str, pat.size());</div>
<div class="line"><span class="lineno"> 86</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt;= str.size() - pat.size(); ++i) {</div>
<div class="line"><span class="lineno"> 87</span> <span class="keywordflow">if</span> (pat_hash == str_hash &amp;&amp;</div>
<div class="line"><span class="lineno"> 88</span> <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#aebe07cea289a13142503d98be7df11fd">check_if_equal</a>(str, pat, i, i + pat.size() - 1, 0,</div>
<div class="line"><span class="lineno"> 89</span> pat.size() - 1)) {</div>
<div class="line"><span class="lineno"> 90</span> <span class="keywordflow">return</span> i;</div>
<div class="line"><span class="lineno"> 91</span> }</div>
<div class="line"><span class="lineno"> 92</span> <span class="keywordflow">if</span> (i &lt; str.size() - pat.size()) {</div>
<div class="line"><span class="lineno"> 93</span> str_hash =</div>
<div class="line"><span class="lineno"> 94</span> <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#aed769d565b705a9b3e0eb1ec74088893">recalculate_hash</a>(str, i, i + pat.size(), str_hash, pat.size());</div>
<div class="line"><span class="lineno"> 95</span> }</div>
<div class="line"><span class="lineno"> 96</span> }</div>
<div class="line"><span class="lineno"> 97</span> <span class="keywordflow">return</span> -1; <span class="comment">// return -1 if given pattern not found</span></div>
<div class="line"><span class="lineno"> 98</span>}</div>
<div class="ttc" id="anamespacestring__search_html_a8fb0bc932ba8b582c9f4c71338d050f8"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html#a8fb0bc932ba8b582c9f4c71338d050f8">string_search::create_hash</a></div><div class="ttdeci">int64_t create_hash(const std::string &amp;s, int n)</div><div class="ttdef"><b>Definition</b> <a href="../../d6/dce/rabin__karp_8cpp_source.html#l00025">rabin_karp.cpp:25</a></div></div>
<div class="ttc" id="anamespacestring__search_html_aebe07cea289a13142503d98be7df11fd"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html#aebe07cea289a13142503d98be7df11fd">string_search::check_if_equal</a></div><div class="ttdeci">bool check_if_equal(const std::string &amp;str1, const std::string &amp;str2, int start1, int end1, int start2, int end2)</div><div class="ttdef"><b>Definition</b> <a href="../../d6/dce/rabin__karp_8cpp_source.html#l00060">rabin_karp.cpp:60</a></div></div>
<div class="ttc" id="anamespacestring__search_html_aed769d565b705a9b3e0eb1ec74088893"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html#aed769d565b705a9b3e0eb1ec74088893">string_search::recalculate_hash</a></div><div class="ttdeci">int64_t recalculate_hash(const std::string &amp;s, int old_index, int new_index, int64_t old_hash, int patLength)</div><div class="ttdef"><b>Definition</b> <a href="../../d6/dce/rabin__karp_8cpp_source.html#l00042">rabin_karp.cpp:42</a></div></div>
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