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<div class="headertitle"><div class="title">rabin_karp.cpp</div></div>
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<a href="../../d6/dce/rabin__karp_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include &lt;cassert&gt;</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include &lt;cmath&gt;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#ifdef _MSC_VER</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include &lt;string&gt;</span> <span class="comment">// use this for MS Visucal C++</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#else</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include &lt;cstring&gt;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"><a class="line" href="../../d6/dce/rabin__karp_8cpp.html#ac4add2a227a10511e0128d63952030e8"> 16</a></span><span class="preprocessor">#define PRIME 5 </span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d9/d03/namespacestring__search.html">string_search</a> {</div>
<div class="foldopen" id="foldopen00025" data-start="{" data-end="}">
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"><a class="line" href="../../d9/d03/namespacestring__search.html#a8fb0bc932ba8b582c9f4c71338d050f8"> 25</a></span>int64_t <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a8fb0bc932ba8b582c9f4c71338d050f8">create_hash</a>(<span class="keyword">const</span> std::string&amp; s, <span class="keywordtype">int</span> n) {</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> int64_t result = 0;</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; n; ++i) {</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> result += (int64_t)(s[i] * (int64_t)pow(<a class="code hl_define" href="../../d6/dce/rabin__karp_8cpp.html#ac4add2a227a10511e0128d63952030e8">PRIME</a>, i));</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> }</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordflow">return</span> result;</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span>}</div>
</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span></div>
<div class="foldopen" id="foldopen00042" data-start="{" data-end="}">
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"><a class="line" href="../../d9/d03/namespacestring__search.html#aed769d565b705a9b3e0eb1ec74088893"> 42</a></span>int64_t <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#aed769d565b705a9b3e0eb1ec74088893">recalculate_hash</a>(<span class="keyword">const</span> std::string&amp; s, <span class="keywordtype">int</span> old_index, <span class="keywordtype">int</span> new_index,</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> int64_t old_hash, <span class="keywordtype">int</span> patLength) {</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> int64_t new_hash = old_hash - s[old_index];</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> new_hash /= <a class="code hl_define" href="../../d6/dce/rabin__karp_8cpp.html#ac4add2a227a10511e0128d63952030e8">PRIME</a>;</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> new_hash += (int64_t)(s[new_index] * (int64_t)pow(<a class="code hl_define" href="../../d6/dce/rabin__karp_8cpp.html#ac4add2a227a10511e0128d63952030e8">PRIME</a>, patLength - 1));</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordflow">return</span> new_hash;</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span>}</div>
</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span></div>
<div class="foldopen" id="foldopen00060" data-start="{" data-end="}">
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"><a class="line" href="../../d9/d03/namespacestring__search.html#aebe07cea289a13142503d98be7df11fd"> 60</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#aebe07cea289a13142503d98be7df11fd">check_if_equal</a>(<span class="keyword">const</span> std::string&amp; str1, <span class="keyword">const</span> std::string&amp; str2,</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordtype">int</span> start1, <span class="keywordtype">int</span> end1, <span class="keywordtype">int</span> start2, <span class="keywordtype">int</span> end2) {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">if</span> (end1 - start1 != end2 - start2) {</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> }</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">while</span> (start1 &lt;= end1 &amp;&amp; start2 &lt;= end2) {</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">if</span> (str1[start1] != str2[start2]) {</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> }</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> start1++;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> start2++;</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span>}</div>
</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> </div>
<div class="foldopen" id="foldopen00083" data-start="{" data-end="}">
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"><a class="line" href="../../d9/d03/namespacestring__search.html#a21c673d56cbf67b1d2ee4d869185b7d9"> 83</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="keyword">const</span> std::string&amp; str, <span class="keyword">const</span> std::string&amp; pat) {</div>
<div class="line"><a id="l00084" name="l00084"></a><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"><a id="l00085" name="l00085"></a><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"><a id="l00086" name="l00086"></a><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"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">if</span> (pat_hash == str_hash &amp;&amp;</div>
<div class="line"><a id="l00088" name="l00088"></a><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"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> pat.size() - 1)) {</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordflow">return</span> i;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> }</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <span class="keywordflow">if</span> (i &lt; str.size() - pat.size()) {</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> str_hash =</div>
<div class="line"><a id="l00094" name="l00094"></a><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"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> }</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> }</div>
<div class="line"><a id="l00097" name="l00097"></a><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"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span>}</div>
</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span>} <span class="comment">// namespace string_search</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="keyword">using </span><a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a21c673d56cbf67b1d2ee4d869185b7d9">string_search::rabin_karp</a>;</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span></div>
<div class="foldopen" id="foldopen00105" data-start="{" data-end="}">
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"><a class="line" href="../../d6/dce/rabin__karp_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe"> 105</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d6/dce/rabin__karp_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>) {</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> assert(<a class="code hl_function" href="../../d6/dce/rabin__karp_8cpp.html#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="stringliteral">&quot;helloWorld&quot;</span>, <span class="stringliteral">&quot;world&quot;</span>) == -1);</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> assert(<a class="code hl_function" href="../../d6/dce/rabin__karp_8cpp.html#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="stringliteral">&quot;helloWorld&quot;</span>, <span class="stringliteral">&quot;World&quot;</span>) == 5);</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> assert(<a class="code hl_function" href="../../d6/dce/rabin__karp_8cpp.html#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"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> assert(<a class="code hl_function" href="../../d6/dce/rabin__karp_8cpp.html#a21c673d56cbf67b1d2ee4d869185b7d9">rabin_karp</a>(<span class="stringliteral">&quot;happy_coding&quot;</span>, <span class="stringliteral">&quot;happy&quot;</span>) == 0);</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span>}</div>
</div>
<div class="ttc" id="anamespacestring__search_html"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html">string_search</a></div><div class="ttdoc">String search algorithms.</div><div class="ttdef"><b>Definition</b> <a href="../../d3/d7d/brute__force__string__searching_8cpp_source.html#l00013">brute_force_string_searching.cpp:13</a></div></div>
<div class="ttc" id="anamespacestring__search_html_a21c673d56cbf67b1d2ee4d869185b7d9"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html#a21c673d56cbf67b1d2ee4d869185b7d9">string_search::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="#l00083">rabin_karp.cpp:83</a></div></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="#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="#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="#l00042">rabin_karp.cpp:42</a></div></div>
<div class="ttc" id="arabin__karp_8cpp_html_a21c673d56cbf67b1d2ee4d869185b7d9"><div class="ttname"><a href="../../d6/dce/rabin__karp_8cpp.html#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="#l00083">rabin_karp.cpp:83</a></div></div>
<div class="ttc" id="arabin__karp_8cpp_html_a840291bc02cba5474a4cb46a9b9566fe"><div class="ttname"><a href="../../d6/dce/rabin__karp_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe">main</a></div><div class="ttdeci">int main(void)</div><div class="ttdef"><b>Definition</b> <a href="#l00105">rabin_karp.cpp:105</a></div></div>
<div class="ttc" id="arabin__karp_8cpp_html_ac4add2a227a10511e0128d63952030e8"><div class="ttname"><a href="../../d6/dce/rabin__karp_8cpp.html#ac4add2a227a10511e0128d63952030e8">PRIME</a></div><div class="ttdeci">#define PRIME</div><div class="ttdoc">Prime modulus for hash functions.</div><div class="ttdef"><b>Definition</b> <a href="#l00016">rabin_karp.cpp:16</a></div></div>
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