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<div class="headertitle"><div class="title">connected_components.cpp</div></div>
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<a href="../../df/ddd/connected__components_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="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include <algorithm></span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include <cassert></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> </div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../df/dce/namespacegraph.html">graph</a> {</div>
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<div class="foldopen" id="foldopen00046" data-start="{" data-end="}">
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"><a class="line" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2"> 46</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">addEdge</a>(std::vector<std::vector<int>> *adj, <span class="keywordtype">int</span> u, <span class="keywordtype">int</span> v) {</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> (*adj)[u - 1].push_back(v - 1);</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> (*adj)[v - 1].push_back(u - 1);</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span>}</div>
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</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span></div>
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<div class="foldopen" id="foldopen00059" data-start="{" data-end="}">
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="../../df/dce/namespacegraph.html#a3ae80bc4c6a79d041b4f3a6589eb7fb8"> 59</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a3ae80bc4c6a79d041b4f3a6589eb7fb8">explore</a>(<span class="keyword">const</span> std::vector<std::vector<int>> *adj, <span class="keywordtype">int</span> u,</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> std::vector<bool> *visited) {</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> (*visited)[u] = <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> v : (*adj)[u]) {</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keywordflow">if</span> (!(*visited)[v]) {</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a3ae80bc4c6a79d041b4f3a6589eb7fb8">explore</a>(adj, v, visited);</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> }</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span>}</div>
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</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="foldopen" id="foldopen00077" data-start="{" data-end="}">
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"><a class="line" href="../../df/dce/namespacegraph.html#a83ab16e96cec644109a58dfc9329bc2b"> 77</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a83ab16e96cec644109a58dfc9329bc2b">getConnectedComponents</a>(<span class="keyword">const</span> std::vector<std::vector<int>> *adj) {</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="keywordtype">int</span> n = adj->size();</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keywordtype">int</span> connected_components = 0;</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> std::vector<bool> visited(n, <span class="keyword">false</span>);</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> </div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</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="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">if</span> (!visited[i]) {</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a3ae80bc4c6a79d041b4f3a6589eb7fb8">explore</a>(adj, i, &visited);</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> connected_components++;</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> }</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> }</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="keywordflow">return</span> connected_components;</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span>}</div>
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</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span>} <span class="comment">// namespace graph</span></div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span></div>
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<div class="foldopen" id="foldopen00093" data-start="{" data-end="}">
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"><a class="line" href="../../df/ddd/connected__components_8cpp.html#a88ec9ad42717780d6caaff9d3d6977f9"> 93</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="../../df/ddd/connected__components_8cpp.html#a88ec9ad42717780d6caaff9d3d6977f9">tests</a>() {</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> std::cout << <span class="stringliteral">"Running predefined tests..."</span> << std::endl;</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> std::cout << <span class="stringliteral">"Initiating Test 1..."</span> << std::endl;</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> std::vector<std::vector<int>> adj1(9, std::vector<int>());</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj1, 1, 2);</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj1, 1, 3);</div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj1, 3, 4);</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj1, 5, 7);</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj1, 5, 6);</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj1, 8, 9);</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> </div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> assert(<a class="code hl_function" href="../../df/dce/namespacegraph.html#a83ab16e96cec644109a58dfc9329bc2b">graph::getConnectedComponents</a>(&adj1) == 3);</div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> std::cout << <span class="stringliteral">"Test 1 Passed..."</span> << std::endl;</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> </div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> std::cout << <span class="stringliteral">"Innitiating Test 2..."</span> << std::endl;</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> std::vector<std::vector<int>> adj2(10, std::vector<int>());</div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 1, 2);</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 1, 3);</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 1, 4);</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 2, 3);</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 3, 4);</div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 4, 8);</div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 4, 10);</div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 8, 10);</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="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 8, 9);</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 5, 7);</div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 5, 6);</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="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj2, 6, 7);</div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> </div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> assert(<a class="code hl_function" href="../../df/dce/namespacegraph.html#a83ab16e96cec644109a58dfc9329bc2b">graph::getConnectedComponents</a>(&adj2) == 2);</div>
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<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> std::cout << <span class="stringliteral">"Test 2 Passed..."</span> << std::endl;</div>
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<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span>}</div>
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</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 class="foldopen" id="foldopen00127" data-start="{" data-end="}">
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<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"><a class="line" href="../../df/ddd/connected__components_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 127</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../df/ddd/connected__components_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">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="../../df/ddd/connected__components_8cpp.html#a88ec9ad42717780d6caaff9d3d6977f9">tests</a>();</div>
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<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> </div>
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<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <span class="keywordtype">int</span> vertices = int(), edges = int();</div>
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<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> std::cout << <span class="stringliteral">"Enter the number of vertices : "</span>;</div>
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<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> std::cin >> vertices;</div>
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<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> std::cout << <span class="stringliteral">"Enter the number of edges : "</span>;</div>
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<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> std::cin >> edges;</div>
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<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> </div>
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<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> std::vector<std::vector<int>> adj(vertices, std::vector<int>());</div>
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<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> </div>
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<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> <span class="keywordtype">int</span> u = int(), v = int();</div>
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<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="keywordflow">while</span> (edges--) {</div>
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<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> std::cin >> u >> v;</div>
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<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&adj, u, v);</div>
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<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> }</div>
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<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> </div>
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<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <span class="keywordtype">int</span> cc = <a class="code hl_function" href="../../df/dce/namespacegraph.html#a83ab16e96cec644109a58dfc9329bc2b">graph::getConnectedComponents</a>(&adj);</div>
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<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> std::cout << cc << std::endl;</div>
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<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span>}</div>
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</div>
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<div class="ttc" id="aconnected__components_8cpp_html_a88ec9ad42717780d6caaff9d3d6977f9"><div class="ttname"><a href="../../df/ddd/connected__components_8cpp.html#a88ec9ad42717780d6caaff9d3d6977f9">tests</a></div><div class="ttdeci">void tests()</div><div class="ttdef"><b>Definition</b> <a href="#l00093">connected_components.cpp:93</a></div></div>
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<div class="ttc" id="aconnected__components_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../df/ddd/connected__components_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition</b> <a href="#l00127">connected_components.cpp:127</a></div></div>
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<div class="ttc" id="anamespacegraph_html"><div class="ttname"><a href="../../df/dce/namespacegraph.html">graph</a></div><div class="ttdoc">Graph Algorithms.</div></div>
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<div class="ttc" id="anamespacegraph_html_a3ae80bc4c6a79d041b4f3a6589eb7fb8"><div class="ttname"><a href="../../df/dce/namespacegraph.html#a3ae80bc4c6a79d041b4f3a6589eb7fb8">graph::explore</a></div><div class="ttdeci">void explore(const std::vector< std::vector< int > > *adj, int u, std::vector< bool > *visited)</div><div class="ttdoc">Utility function for depth first seach algorithm this function explores the vertex which is passed in...</div><div class="ttdef"><b>Definition</b> <a href="#l00059">connected_components.cpp:59</a></div></div>
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<div class="ttc" id="anamespacegraph_html_a83ab16e96cec644109a58dfc9329bc2b"><div class="ttname"><a href="../../df/dce/namespacegraph.html#a83ab16e96cec644109a58dfc9329bc2b">graph::getConnectedComponents</a></div><div class="ttdeci">int getConnectedComponents(const std::vector< std::vector< int > > *adj)</div><div class="ttdoc">Function that perfoms depth first search algorithm on graph and calculated the number of connected co...</div><div class="ttdef"><b>Definition</b> <a href="#l00077">connected_components.cpp:77</a></div></div>
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<div class="ttc" id="anamespacegraph_html_a9125ceb66bfbec3093bba64c2c1e99e2"><div class="ttname"><a href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a></div><div class="ttdeci">void addEdge(std::vector< std::vector< int > > *adj, int u, int v)</div><div class="ttdoc">Function that add edge between two nodes or vertices of graph.</div><div class="ttdef"><b>Definition</b> <a href="#l00046">connected_components.cpp:46</a></div></div>
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