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<div class="headertitle"><div class="title">radix_sort2.cpp</div></div>
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<div class="contents">
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<a href="../../d8/d61/radix__sort2_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>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span></div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="preprocessor">#include <algorithm></span> </div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include <cassert></span> </div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include <vector></span> </div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span></div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d5/d91/namespacesorting.html">sorting</a> {</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../da/dda/namespaceradix__sort.html">radix_sort</a> {</div>
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<div class="foldopen" id="foldopen00051" data-start="{" data-end="}">
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"><a class="line" href="../../d8/d61/radix__sort2_8cpp.html#a98ead7d43b11505398daf9a894f122f9"> 51</a></span>std::vector<uint64_t> <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#a98ead7d43b11505398daf9a894f122f9">step_ith</a>(</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> uint16_t cur_digit,</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keyword">const</span> std::vector<uint64_t>& ar) { <span class="comment">// sorting according to current digit.</span></div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keywordtype">int</span> n = ar.size();</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> std::vector<uint32_t> position(10, 0);</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; ++i) {</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> position[(ar[i] / cur_digit) %</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> 10]++; <span class="comment">// counting frequency of 0-9 at cur_digit.</span></div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> }</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordtype">int</span> cur = 0;</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 10; ++i) {</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordtype">int</span> a = position[i];</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> position[i] = cur; <span class="comment">// assingning starting position of 0-9.</span></div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> cur += a;</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> }</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> std::vector<uint64_t> temp(n);</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; ++i) {</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> temp[position[(ar[i] / cur_digit) % 10]] =</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> ar[i]; <span class="comment">// storing ar[i] in ar[i]'s cur_digit expected position of</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// this step.</span></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> position[(ar[i] / cur_digit) %</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> 10]++; <span class="comment">// incrementing ar[i]'s cur_digit position by 1, as</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// current place used by ar[i].</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> }</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="keywordflow">return</span> temp;</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span>}</div>
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</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span></div>
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<div class="foldopen" id="foldopen00082" data-start="{" data-end="}">
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"><a class="line" href="../../d8/d61/radix__sort2_8cpp.html#ae0cfd94fa3765b53d4ec7893ffaee5f8"> 82</a></span>std::vector<uint64_t> <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#ae0cfd94fa3765b53d4ec7893ffaee5f8">radix</a>(<span class="keyword">const</span> std::vector<uint64_t>& ar) {</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> uint64_t max_ele =</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> *max_element(ar.begin(), ar.end()); <span class="comment">// returns the max element.</span></div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> std::vector<uint64_t> temp = ar;</div>
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<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 = 1; max_ele / i > 0;</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> i *= 10) { <span class="comment">// loop breaks when i > max_ele because no further digits</span></div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// left to makes changes in aray.</span></div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> temp = <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#a98ead7d43b11505398daf9a894f122f9">step_ith</a>(i, temp);</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> }</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordflow">for</span> (uint64_t i : temp) {</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> std::cout << i << <span class="stringliteral">" "</span>;</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> }</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> std::cout << <span class="stringliteral">"\n"</span>;</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="keywordflow">return</span> temp;</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span>}</div>
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</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span>} <span class="comment">// namespace radix_sort</span></div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span>} <span class="comment">// namespace sorting</span></div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span></div>
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<div class="foldopen" id="foldopen00104" data-start="{" data-end="}">
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"><a class="line" href="../../d8/d61/radix__sort2_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e"> 104</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>() {</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> std::vector<uint64_t> ar1 = {432, 234, 143, 332, 123};</div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> ar1 = <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#ae0cfd94fa3765b53d4ec7893ffaee5f8">sorting::radix_sort::radix</a>(ar1);</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> assert(std::is_sorted(ar1.begin(), ar1.end()));</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> std::vector<uint64_t> ar2 = {213, 3214, 123, 111, 112, 142,</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> 133, 132, 32, 12, 113};</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> ar2 = <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#ae0cfd94fa3765b53d4ec7893ffaee5f8">sorting::radix_sort::radix</a>(ar2);</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> assert(std::is_sorted(ar2.begin(), ar2.end()));</div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span>}</div>
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</div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span></div>
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<div class="foldopen" id="foldopen00119" data-start="{" data-end="}">
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"><a class="line" href="../../d8/d61/radix__sort2_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 119</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <a class="code hl_function" href="../../d8/d61/radix__sort2_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>(); <span class="comment">// execute the tests</span></div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span>}</div>
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</div>
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<div class="ttc" id="anamespaceradix__sort_html"><div class="ttname"><a href="../../da/dda/namespaceradix__sort.html">radix_sort</a></div><div class="ttdoc">Functions for Radix sort algorithm.</div></div>
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<div class="ttc" id="anamespacesorting_html"><div class="ttname"><a href="../../d5/d91/namespacesorting.html">sorting</a></div><div class="ttdoc">for working with vectors</div></div>
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<div class="ttc" id="aradix__sort2_8cpp_html_a483bb8ccf42aaf7375a83e91490eda1e"><div class="ttname"><a href="../../d8/d61/radix__sort2_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a></div><div class="ttdeci">static void tests()</div><div class="ttdoc">Function to test the above algorithm.</div><div class="ttdef"><b>Definition</b> <a href="#l00104">radix_sort2.cpp:104</a></div></div>
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<div class="ttc" id="aradix__sort2_8cpp_html_a98ead7d43b11505398daf9a894f122f9"><div class="ttname"><a href="../../d8/d61/radix__sort2_8cpp.html#a98ead7d43b11505398daf9a894f122f9">sorting::radix_sort::step_ith</a></div><div class="ttdeci">std::vector< uint64_t > step_ith(uint16_t cur_digit, const std::vector< uint64_t > &ar)</div><div class="ttdoc">Function to sort vector according to current digit using stable sorting.</div><div class="ttdef"><b>Definition</b> <a href="#l00051">radix_sort2.cpp:51</a></div></div>
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<div class="ttc" id="aradix__sort2_8cpp_html_ae0cfd94fa3765b53d4ec7893ffaee5f8"><div class="ttname"><a href="../../d8/d61/radix__sort2_8cpp.html#ae0cfd94fa3765b53d4ec7893ffaee5f8">sorting::radix_sort::radix</a></div><div class="ttdeci">std::vector< uint64_t > radix(const std::vector< uint64_t > &ar)</div><div class="ttdoc">Function to sort vector digit by digit.</div><div class="ttdef"><b>Definition</b> <a href="#l00082">radix_sort2.cpp:82</a></div></div>
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<div class="ttc" id="aradix__sort2_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d8/d61/radix__sort2_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main function.</div><div class="ttdef"><b>Definition</b> <a href="#l00119">radix_sort2.cpp:119</a></div></div>
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