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<div class="headertitle"><div class="title">dnf_sort.cpp File Reference</div></div>
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<p>Implementation of the <a href="https://www.geeksforgeeks.org/sort-an-array-of-0s-1s-and-2s/" target="_blank">DNF sort</a> implementation.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <algorithm></code><br />
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<code>#include <cassert></code><br />
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<code>#include <iostream></code><br />
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<code>#include <vector></code><br />
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</div><div class="textblock"><div class="dynheader">
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Include dependency graph for dnf_sort.cpp:</div>
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<div class="dyncontent">
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Namespaces</h2></td></tr>
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<tr class="memitem:d5/d91/namespacesorting"><td class="memItemLeft" align="right" valign="top">namespace  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d5/d91/namespacesorting.html">sorting</a></td></tr>
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<tr class="memdesc:d5/d91/namespacesorting"><td class="mdescLeft"> </td><td class="mdescRight">for working with vectors <br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:d9/d75/namespacednf__sort"><td class="memItemLeft" align="right" valign="top">namespace  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/d75/namespacednf__sort.html">dnf_sort</a></td></tr>
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<tr class="memdesc:d9/d75/namespacednf__sort"><td class="mdescLeft"> </td><td class="mdescRight">Functions for the <a href="https://en.wikipedia.org/wiki/Dutch_national_flag_problem" target="_blank">DNF sort</a> implementation. <br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:a621767fe711db64fe57a2ac4987b11f0"><td class="memTemplParams" colspan="2">template<typename T > </td></tr>
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<tr class="memitem:a621767fe711db64fe57a2ac4987b11f0"><td class="memTemplItemLeft" align="right" valign="top"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< T > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="../../d6/d1a/dnf__sort_8cpp.html#a621767fe711db64fe57a2ac4987b11f0">sorting::dnf_sort::dnfSort</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< T > &in_arr)</td></tr>
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<tr class="memdesc:a621767fe711db64fe57a2ac4987b11f0"><td class="mdescLeft"> </td><td class="mdescRight">The main function implements DNF sort. <a href="../../d6/d1a/dnf__sort_8cpp.html#a621767fe711db64fe57a2ac4987b11f0">More...</a><br /></td></tr>
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<tr class="separator:a621767fe711db64fe57a2ac4987b11f0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d1a/dnf__sort_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
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<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft"> </td><td class="mdescRight">Self-test implementations. <a href="../../d6/d1a/dnf__sort_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">More...</a><br /></td></tr>
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<tr class="separator:aa8dca7b867074164d5f45b0f3851269d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d1a/dnf__sort_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft"> </td><td class="mdescRight">Main function. <a href="../../d6/d1a/dnf__sort_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">More...</a><br /></td></tr>
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<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p >Implementation of the <a href="https://www.geeksforgeeks.org/sort-an-array-of-0s-1s-and-2s/" target="_blank">DNF sort</a> implementation. </p>
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<p >C++ program to sort an array with 0, 1 and 2 in a single pass(DNF sort). Since one traversal of the array is there hence it works in O(n) time complexity. </p><dl class="section author"><dt>Author</dt><dd><a href="https://github.com/heysujal" target="_blank">Sujal Gupta</a> </dd></dl>
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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="a621767fe711db64fe57a2ac4987b11f0" name="a621767fe711db64fe57a2ac4987b11f0"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a621767fe711db64fe57a2ac4987b11f0">◆ </a></span>dnfSort()</h2>
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template<typename T > </div>
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<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< T > sorting::dnf_sort::dnfSort </td>
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<td>(</td>
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<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< T > & </td>
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<td class="paramname"><em>in_arr</em></td><td>)</td>
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<p>The main function implements DNF sort. </p>
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<dl class="tparams"><dt>Template Parameters</dt><dd>
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<table class="tparams">
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<tr><td class="paramname">T</td><td>type of array </td></tr>
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</dd>
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</dl>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">a</td><td>array to be sorted, </td></tr>
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<tr><td class="paramname">arr_size</td><td>size of array </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 38</span> {</div>
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<div class="line"><span class="lineno"> 39</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<T></a> arr(in_arr);</div>
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<div class="line"><span class="lineno"> 40</span> uint64_t lo = 0;</div>
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<div class="line"><span class="lineno"> 41</span> uint64_t hi = arr.size() - 1;</div>
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<div class="line"><span class="lineno"> 42</span> uint64_t mid = 0;</div>
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<div class="line"><span class="lineno"> 43</span> </div>
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<div class="line"><span class="lineno"> 44</span> <span class="comment">// Iterate till all the elements</span></div>
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<div class="line"><span class="lineno"> 45</span> <span class="comment">// are sorted</span></div>
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<div class="line"><span class="lineno"> 46</span> <span class="keywordflow">while</span> (mid <= hi) {</div>
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<div class="line"><span class="lineno"> 47</span> <span class="keywordflow">switch</span> (arr[mid]) {</div>
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<div class="line"><span class="lineno"> 48</span> <span class="comment">// If the element is 0</span></div>
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<div class="line"><span class="lineno"> 49</span> <span class="keywordflow">case</span> 0:</div>
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<div class="line"><span class="lineno"> 50</span> <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/swap.html">std::swap</a>(arr[lo++], arr[mid++]);</div>
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<div class="line"><span class="lineno"> 51</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><span class="lineno"> 52</span> </div>
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<div class="line"><span class="lineno"> 53</span> <span class="comment">// If the element is 1 .</span></div>
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<div class="line"><span class="lineno"> 54</span> <span class="keywordflow">case</span> 1:</div>
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<div class="line"><span class="lineno"> 55</span> mid++;</div>
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<div class="line"><span class="lineno"> 56</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><span class="lineno"> 57</span> </div>
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<div class="line"><span class="lineno"> 58</span> <span class="comment">// If the element is 2</span></div>
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<div class="line"><span class="lineno"> 59</span> <span class="keywordflow">case</span> 2:</div>
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<div class="line"><span class="lineno"> 60</span> <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/swap.html">std::swap</a>(arr[mid], arr[hi--]);</div>
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<div class="line"><span class="lineno"> 61</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><span class="lineno"> 62</span> }</div>
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<div class="line"><span class="lineno"> 63</span> }</div>
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<div class="line"><span class="lineno"> 64</span> <span class="keywordflow">return</span> arr;</div>
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<div class="line"><span class="lineno"> 65</span>}</div>
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<div class="ttc" id="aswap_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/swap.html">std::swap</a></div><div class="ttdeci">T swap(T... args)</div></div>
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<div class="ttc" id="avector_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a></div></div>
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</div><!-- fragment --><div class="dynheader">
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Here is the call graph for this function:</div>
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<div class="center"><iframe scrolling="no" frameborder="0" src="../../d6/d1a/dnf__sort_8cpp_a621767fe711db64fe57a2ac4987b11f0_cgraph.svg" width="299" height="92"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">◆ </a></span>main()</h2>
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<td class="memname">int main </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<td class="paramname"></td><td>)</td>
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<p>Main function. </p>
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<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 108</span> {</div>
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<div class="line"><span class="lineno"> 109</span> <a class="code hl_function" href="../../d6/d1a/dnf__sort_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// execute the test</span></div>
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<div class="line"><span class="lineno"> 110</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 111</span>}</div>
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<div class="ttc" id="adnf__sort_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d6/d1a/dnf__sort_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition:</b> dnf_sort.cpp:73</div></div>
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<div class="center"><iframe scrolling="no" frameborder="0" src="../../d6/d1a/dnf__sort_8cpp_ae66f6b31b5ad750f1fe042a706a4e3d4_cgraph.svg" width="303" height="184"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8dca7b867074164d5f45b0f3851269d">◆ </a></span>test()</h2>
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<td class="memname">static void test </td>
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<p>Self-test implementations. </p>
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<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 73</span> {</div>
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<div class="line"><span class="lineno"> 74</span> <span class="comment">// 1st test</span></div>
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<div class="line"><span class="lineno"> 75</span> <span class="comment">// [1, 0, 2, 1] return [0, 1, 1, 2]</span></div>
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<div class="line"><span class="lineno"> 76</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> array1 = {0, 1, 1, 2};</div>
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<div class="line"><span class="lineno"> 77</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Test 1... "</span>;</div>
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<div class="line"><span class="lineno"> 78</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> arr1 = <a class="code hl_function" href="../../d6/d1a/dnf__sort_8cpp.html#a621767fe711db64fe57a2ac4987b11f0">sorting::dnf_sort::dnfSort</a>(array1);</div>
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<div class="line"><span class="lineno"> 79</span> assert(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/is_sorted.html">std::is_sorted</a>(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/begin.html">std::begin</a>(arr1), <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">std::end</a>(arr1)));</div>
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<div class="line"><span class="lineno"> 80</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 81</span> <span class="comment">// 2nd test</span></div>
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<div class="line"><span class="lineno"> 82</span> <span class="comment">// [1, 0, 0, 1, 1, 0, 2, 1] return [0, 0, 0, 1, 1, 1, 1, 2]</span></div>
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<div class="line"><span class="lineno"> 83</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> array2 = {1, 0, 0, 1, 1, 0, 2, 1};</div>
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<div class="line"><span class="lineno"> 84</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Test 2... "</span>;</div>
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<div class="line"><span class="lineno"> 85</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> arr2 = <a class="code hl_function" href="../../d6/d1a/dnf__sort_8cpp.html#a621767fe711db64fe57a2ac4987b11f0">sorting::dnf_sort::dnfSort</a>(array2);</div>
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<div class="line"><span class="lineno"> 86</span> assert(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/is_sorted.html">std::is_sorted</a>(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/begin.html">std::begin</a>(arr2), <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">std::end</a>(arr2)));</div>
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<div class="line"><span class="lineno"> 87</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 88</span> <span class="comment">// 3rd test</span></div>
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<div class="line"><span class="lineno"> 89</span> <span class="comment">// [1, 1, 0, 0, 1, 2, 2, 0, 2, 1] return [0, 0, 0, 1, 1, 1, 1, 2, 2, 2]</span></div>
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<div class="line"><span class="lineno"> 90</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> array3 = {1, 1, 0, 0, 1, 2, 2, 0, 2, 1};</div>
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<div class="line"><span class="lineno"> 91</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Test 3... "</span>;</div>
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<div class="line"><span class="lineno"> 92</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> arr3 = <a class="code hl_function" href="../../d6/d1a/dnf__sort_8cpp.html#a621767fe711db64fe57a2ac4987b11f0">sorting::dnf_sort::dnfSort</a>(array3);</div>
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<div class="line"><span class="lineno"> 93</span> assert(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/is_sorted.html">std::is_sorted</a>(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/begin.html">std::begin</a>(arr3), <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">std::end</a>(arr3)));</div>
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<div class="line"><span class="lineno"> 94</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 95</span> <span class="comment">// 4th test</span></div>
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<div class="line"><span class="lineno"> 96</span> <span class="comment">// [2, 2, 2, 0, 0, 1, 1] return [0, 0, 1, 1, 2, 2, 2]</span></div>
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<div class="line"><span class="lineno"> 97</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> array4 = {2, 2, 2, 0, 0, 1, 1};</div>
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<div class="line"><span class="lineno"> 98</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Test 4... "</span>;</div>
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<div class="line"><span class="lineno"> 99</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<uint64_t></a> arr4 = <a class="code hl_function" href="../../d6/d1a/dnf__sort_8cpp.html#a621767fe711db64fe57a2ac4987b11f0">sorting::dnf_sort::dnfSort</a>(array4);</div>
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<div class="line"><span class="lineno"> 100</span> assert(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/is_sorted.html">std::is_sorted</a>(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/begin.html">std::begin</a>(arr4), <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">std::end</a>(arr4)));</div>
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<div class="line"><span class="lineno"> 101</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 102</span>}</div>
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<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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<div class="ttc" id="abegin_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/iterator/begin.html">std::begin</a></div><div class="ttdeci">T begin(T... args)</div></div>
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<div class="ttc" id="adnf__sort_8cpp_html_a621767fe711db64fe57a2ac4987b11f0"><div class="ttname"><a href="../../d6/d1a/dnf__sort_8cpp.html#a621767fe711db64fe57a2ac4987b11f0">sorting::dnf_sort::dnfSort</a></div><div class="ttdeci">std::vector< T > dnfSort(const std::vector< T > &in_arr)</div><div class="ttdoc">The main function implements DNF sort.</div><div class="ttdef"><b>Definition:</b> dnf_sort.cpp:38</div></div>
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<div class="ttc" id="aend_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/iterator/end.html">std::end</a></div><div class="ttdeci">T end(T... args)</div></div>
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<div class="ttc" id="aendl_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div><div class="ttdeci">T endl(T... args)</div></div>
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<div class="ttc" id="ais_sorted_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/is_sorted.html">std::is_sorted</a></div><div class="ttdeci">T is_sorted(T... args)</div></div>
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