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<div class="headertitle"><div class="title">wiggle_sort.cpp</div></div>
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<a href="../../d1/dcc/wiggle__sort_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="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#include <cassert></span></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include <ctime></span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include <vector></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="l00031" name="l00031"></a><span class="lineno"> 31</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="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d0/d52/namespacewiggle__sort.html">wiggle_sort</a> {</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="comment">// this allows to have vectors of ints, double, float,</span></div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="comment">// etc</span></div>
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<div class="foldopen" id="foldopen00054" data-start="{" data-end="}">
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"><a class="line" href="../../d1/dcc/wiggle__sort_8cpp.html#a99eeded693ac073717282fae365957a1"> 54</a></span>std::vector<T> <a class="code hl_function" href="../../d1/dcc/wiggle__sort_8cpp.html#a99eeded693ac073717282fae365957a1">wiggleSort</a>(<span class="keyword">const</span> std::vector<T> &arr) {</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> uint32_t size = arr.size();</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> </div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> std::vector<T> out(</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> arr); <span class="comment">// create a copy of input vector. this way, the original input</span></div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// vector does not get modified. a sorted array is is returned.</span></div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> </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 < size; i += 2) {</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">if</span> (i > 0 && out[i - 1] > out[i]) {</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> std::swap(out[i], out[i - 1]); <span class="comment">// swapping the two values</span></div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> }</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> <span class="keywordflow">if</span> (i < size - 1 && out[i] < out[i + 1]) {</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> std::swap(out[i], out[i + 1]); <span class="comment">// swapping the two values</span></div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> }</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> }</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keywordflow">return</span> out; <span class="comment">// returns the sorted vector</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span>}</div>
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</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span>} <span class="comment">// namespace wiggle_sort</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span>} <span class="comment">// namespace sorting</span></div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span><span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="foldopen" id="foldopen00086" data-start="{" data-end="}">
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"><a class="line" href="../../d5/d4c/group__sorting.html#ga135e4c638e3bcf548bd122b5f49a3e72"> 86</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d5/d4c/group__sorting.html#ga135e4c638e3bcf548bd122b5f49a3e72">displayElements</a>(<span class="keyword">const</span> std::vector<T> &arr) {</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> uint32_t size = arr.size();</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> </div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> std::cout << <span class="stringliteral">"Sorted elements are as follows: "</span>;</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> std::cout << <span class="stringliteral">"["</span>;</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> </div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < size; i++) {</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> std::cout << arr[i];</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="keywordflow">if</span> (i != size - 1) {</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> std::cout << <span class="stringliteral">", "</span>;</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> }</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</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="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> std::cout << <span class="stringliteral">"]"</span> << std::endl;</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span>}</div>
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</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> </div>
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<div class="foldopen" id="foldopen00107" data-start="{" data-end="}">
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"><a class="line" href="../../d5/d4c/group__sorting.html#gaa8dca7b867074164d5f45b0f3851269d"> 107</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d5/d4c/group__sorting.html#gaa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> std::srand(std::time(<span class="keyword">nullptr</span>)); <span class="comment">// initialize random number generator</span></div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> </div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> std::vector<float> data1(100);</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> &d : data1) { <span class="comment">// generate random numbers between -5.0 and 4.99</span></div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> d = float(std::rand() % 1000 - 500) / 100.f;</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> }</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 class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> std::vector<float> sorted = sorting::wiggle_sort::wiggleSort<float>(data1);</div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> </div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <a class="code hl_function" href="../../d5/d4c/group__sorting.html#ga135e4c638e3bcf548bd122b5f49a3e72">displayElements</a>(sorted);</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> </div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> <span class="keywordflow">for</span> (uint32_t j = 0; j < data1.size(); j += 2) {</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> assert(data1[j] <= data1[j + 1] &&</div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> data1[j + 1] >= data1[j + 2]); <span class="comment">// check the validation condition</span></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 class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> </div>
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<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> std::cout << <span class="stringliteral">"Test 1 passed\n"</span>;</div>
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<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span>}</div>
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</div>
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<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> </div>
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<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span><span class="keywordtype">int</span> <a class="code hl_function" href="../../dd/d1e/generate__parentheses_8cpp.html#gae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> <a class="code hl_function" href="../../d5/d4c/group__sorting.html#gaa8dca7b867074164d5f45b0f3851269d">test</a>();</div>
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<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span>}</div>
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<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> </div>
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<div class="ttc" id="agenerate__parentheses_8cpp_html_gae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../dd/d1e/generate__parentheses_8cpp.html#gae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main function.</div><div class="ttdef"><b>Definition</b> <a href="../../dd/d1e/generate__parentheses_8cpp_source.html#l00110">generate_parentheses.cpp:110</a></div></div>
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<div class="ttc" id="agroup__sorting_html_ga135e4c638e3bcf548bd122b5f49a3e72"><div class="ttname"><a href="../../d5/d4c/group__sorting.html#ga135e4c638e3bcf548bd122b5f49a3e72">displayElements</a></div><div class="ttdeci">static void displayElements(const std::vector< T > &arr)</div><div class="ttdoc">Utility function used for printing the elements. Prints elements of the array after they're sorted us...</div><div class="ttdef"><b>Definition</b> <a href="#l00086">wiggle_sort.cpp:86</a></div></div>
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<div class="ttc" id="agroup__sorting_html_gaa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d5/d4c/group__sorting.html#gaa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdef"><b>Definition</b> <a href="#l00107">wiggle_sort.cpp:107</a></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="anamespacewiggle__sort_html"><div class="ttname"><a href="../../d0/d52/namespacewiggle__sort.html">wiggle_sort</a></div><div class="ttdoc">Functions for Wiggle Sort algorithm.</div></div>
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<div class="ttc" id="awiggle__sort_8cpp_html_a99eeded693ac073717282fae365957a1"><div class="ttname"><a href="../../d1/dcc/wiggle__sort_8cpp.html#a99eeded693ac073717282fae365957a1">sorting::wiggle_sort::wiggleSort</a></div><div class="ttdeci">std::vector< T > wiggleSort(const std::vector< T > &arr)</div><div class="ttdoc">Function used for sorting the elements in wave form.</div><div class="ttdef"><b>Definition</b> <a href="#l00054">wiggle_sort.cpp:54</a></div></div>
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