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<p>[<a class="el" href="../../da/d9a/class_graph.html">Graph</a> Dijkstras Shortest Path Algorithm (Dijkstra's Shortest Path)] (<a href="https://en.wikipedia.org/wiki/Dijkstra%27s_algorithm">https://en.wikipedia.org/wiki/Dijkstra%27s_algorithm</a>)
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;limits&gt;</code><br />
<code>#include &lt;memory&gt;</code><br />
<code>#include &lt;queue&gt;</code><br />
<code>#include &lt;utility&gt;</code><br />
<code>#include &lt;vector&gt;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for dijkstra.cpp:</div>
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Namespaces</h2></td></tr>
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<tr class="memdesc:df/dce/namespacegraph"><td class="mdescLeft">&#160;</td><td class="mdescRight"><a class="el" href="../../dc/d61/classgraph_1_1_graph.html">Graph</a> Algorithms. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a0e30e0dca68cb6e4f671440819b35b6a" id="r_a0e30e0dca68cb6e4f671440819b35b6a"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/dce/namespacegraph.html#a0e30e0dca68cb6e4f671440819b35b6a">graph::addEdge</a> (<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair</a>&lt; int, int &gt; &gt; &gt; *adj, int u, int v, int w)</td></tr>
<tr class="memdesc:a0e30e0dca68cb6e4f671440819b35b6a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function that add edge between two nodes or vertices of graph. <br /></td></tr>
<tr class="separator:a0e30e0dca68cb6e4f671440819b35b6a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:adc68cbc8ba09eb1142265935c0d45b84" id="r_adc68cbc8ba09eb1142265935c0d45b84"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/dce/namespacegraph.html#adc68cbc8ba09eb1142265935c0d45b84">graph::dijkstra</a> (<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair</a>&lt; int, int &gt; &gt; &gt; *adj, int s, int t)</td></tr>
<tr class="memdesc:adc68cbc8ba09eb1142265935c0d45b84"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function runs the dijkstra algorithm for some source vertex and target vertex in the graph and returns the shortest distance of target from the source. <br /></td></tr>
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Variables</h2></td></tr>
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constexpr int64_t&#160;</td><td class="memItemRight" valign="bottom"><b>INF</b> = <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits</a>&lt;int64_t&gt;::max()</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>[<a class="el" href="../../da/d9a/class_graph.html">Graph</a> Dijkstras Shortest Path Algorithm (Dijkstra's Shortest Path)] (<a href="https://en.wikipedia.org/wiki/Dijkstra%27s_algorithm">https://en.wikipedia.org/wiki/Dijkstra%27s_algorithm</a>) </p>
<dl class="section author"><dt>Author</dt><dd><a href="http://github.com/ayaankhan98" target="_blank">Ayaan Khan</a></dd></dl>
<p>Dijkstra's Algorithm is used to find the shortest path from a source vertex to all other reachable vertex in the graph. The algorithm initially assumes all the nodes are unreachable from the given source vertex so we mark the distances of all vertices as INF (infinity) from source vertex (INF / infinity denotes unable to reach).</p>
<p>in similar fashion with BFS we assume the distance of source vertex as 0 and pushes the vertex in a priority queue with it's distance. we maintain the priority queue as a min heap so that we can get the minimum element at the top of heap</p>
<p>Basically what we do in this algorithm is that we try to minimize the distances of all the reachable vertices from the current vertex, look at the code below to understand in better way. </p>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
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<p>Main function </p>
<div class="fragment"><div class="line"><span class="lineno"> 152</span> {</div>
<div class="line"><span class="lineno"> 153</span> <span class="comment">// running predefined tests</span></div>
<div class="line"><span class="lineno"> 154</span> <a class="code hl_function" href="#a88ec9ad42717780d6caaff9d3d6977f9">tests</a>();</div>
<div class="line"><span class="lineno"> 155</span> </div>
<div class="line"><span class="lineno"> 156</span> <span class="keywordtype">int</span> vertices = int(), edges = int();</div>
<div class="line"><span class="lineno"> 157</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Enter the number of vertices : &quot;</span>;</div>
<div class="line"><span class="lineno"> 158</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a> &gt;&gt; vertices;</div>
<div class="line"><span class="lineno"> 159</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Enter the number of edges : &quot;</span>;</div>
<div class="line"><span class="lineno"> 160</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a> &gt;&gt; edges;</div>
<div class="line"><span class="lineno"> 161</span> </div>
<div class="line"><span class="lineno"> 162</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;int, int&gt;</a>&gt;&gt; adj(</div>
<div class="line"><span class="lineno"> 163</span> vertices, <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;int, int&gt;</a>&gt;());</div>
<div class="line"><span class="lineno"> 164</span> </div>
<div class="line"><span class="lineno"> 165</span> <span class="keywordtype">int</span> u = int(), v = int(), w = int();</div>
<div class="line"><span class="lineno"> 166</span> <span class="keywordflow">while</span> (edges--) {</div>
<div class="line"><span class="lineno"> 167</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a> &gt;&gt; u &gt;&gt; v &gt;&gt; w;</div>
<div class="line"><span class="lineno"> 168</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj, u, v, w);</div>
<div class="line"><span class="lineno"> 169</span> }</div>
<div class="line"><span class="lineno"> 170</span> </div>
<div class="line"><span class="lineno"> 171</span> <span class="keywordtype">int</span> s = int(), t = int();</div>
<div class="line"><span class="lineno"> 172</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a> &gt;&gt; s &gt;&gt; t;</div>
<div class="line"><span class="lineno"> 173</span> <span class="keywordtype">int</span> dist = <a class="code hl_function" href="../../df/dce/namespacegraph.html#adc68cbc8ba09eb1142265935c0d45b84">graph::dijkstra</a>(&amp;adj, s - 1, t - 1);</div>
<div class="line"><span class="lineno"> 174</span> <span class="keywordflow">if</span> (dist == -1) {</div>
<div class="line"><span class="lineno"> 175</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Target not reachable from source&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 176</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 177</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Shortest Path Distance : &quot;</span> &lt;&lt; dist &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 178</span> }</div>
<div class="line"><span class="lineno"> 179</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 180</span>}</div>
<div class="ttc" id="abasic_istream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a></div></div>
<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>
<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>
<div class="ttc" id="agraph_2dijkstra_8cpp_html_a88ec9ad42717780d6caaff9d3d6977f9"><div class="ttname"><a href="#a88ec9ad42717780d6caaff9d3d6977f9">tests</a></div><div class="ttdeci">void tests()</div><div class="ttdef"><b>Definition</b> dijkstra.cpp:113</div></div>
<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&lt; std::vector&lt; int &gt; &gt; *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> connected_components.cpp:46</div></div>
<div class="ttc" id="anamespacegraph_html_adc68cbc8ba09eb1142265935c0d45b84"><div class="ttname"><a href="../../df/dce/namespacegraph.html#adc68cbc8ba09eb1142265935c0d45b84">graph::dijkstra</a></div><div class="ttdeci">int dijkstra(std::vector&lt; std::vector&lt; std::pair&lt; int, int &gt; &gt; &gt; *adj, int s, int t)</div><div class="ttdoc">Function runs the dijkstra algorithm for some source vertex and target vertex in the graph and return...</div><div class="ttdef"><b>Definition</b> dijkstra.cpp:66</div></div>
<div class="ttc" id="apair_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair</a></div></div>
<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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Here is the call graph for this function:</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a88ec9ad42717780d6caaff9d3d6977f9">&#9670;&#160;</a></span>tests()</h2>
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<td class="memname">void tests </td>
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<p>Function to test the Algorithm </p>
<div class="fragment"><div class="line"><span class="lineno"> 113</span> {</div>
<div class="line"><span class="lineno"> 114</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Initiatinig Predefined Tests...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 115</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Initiating Test 1...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 116</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;int, int&gt;</a>&gt;&gt; adj1(</div>
<div class="line"><span class="lineno"> 117</span> 4, <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;int, int&gt;</a>&gt;());</div>
<div class="line"><span class="lineno"> 118</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj1, 1, 2, 1);</div>
<div class="line"><span class="lineno"> 119</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj1, 4, 1, 2);</div>
<div class="line"><span class="lineno"> 120</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj1, 2, 3, 2);</div>
<div class="line"><span class="lineno"> 121</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj1, 1, 3, 5);</div>
<div class="line"><span class="lineno"> 122</span> </div>
<div class="line"><span class="lineno"> 123</span> <span class="keywordtype">int</span> s = 1, t = 3;</div>
<div class="line"><span class="lineno"> 124</span> assert(<a class="code hl_function" href="../../df/dce/namespacegraph.html#adc68cbc8ba09eb1142265935c0d45b84">graph::dijkstra</a>(&amp;adj1, s - 1, t - 1) == 3);</div>
<div class="line"><span class="lineno"> 125</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 1 Passed...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 126</span> </div>
<div class="line"><span class="lineno"> 127</span> s = 4, t = 3;</div>
<div class="line"><span class="lineno"> 128</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Initiating Test 2...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 129</span> assert(<a class="code hl_function" href="../../df/dce/namespacegraph.html#adc68cbc8ba09eb1142265935c0d45b84">graph::dijkstra</a>(&amp;adj1, s - 1, t - 1) == 5);</div>
<div class="line"><span class="lineno"> 130</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 2 Passed...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 131</span> </div>
<div class="line"><span class="lineno"> 132</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;int, int&gt;</a>&gt;&gt; adj2(</div>
<div class="line"><span class="lineno"> 133</span> 5, <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;int, int&gt;</a>&gt;());</div>
<div class="line"><span class="lineno"> 134</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 1, 2, 4);</div>
<div class="line"><span class="lineno"> 135</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 1, 3, 2);</div>
<div class="line"><span class="lineno"> 136</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 2, 3, 2);</div>
<div class="line"><span class="lineno"> 137</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 3, 2, 1);</div>
<div class="line"><span class="lineno"> 138</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 2, 4, 2);</div>
<div class="line"><span class="lineno"> 139</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 3, 5, 4);</div>
<div class="line"><span class="lineno"> 140</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 5, 4, 1);</div>
<div class="line"><span class="lineno"> 141</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 2, 5, 3);</div>
<div class="line"><span class="lineno"> 142</span> <a class="code hl_function" href="../../df/dce/namespacegraph.html#a9125ceb66bfbec3093bba64c2c1e99e2">graph::addEdge</a>(&amp;adj2, 3, 4, 4);</div>
<div class="line"><span class="lineno"> 143</span> </div>
<div class="line"><span class="lineno"> 144</span> s = 1, t = 5;</div>
<div class="line"><span class="lineno"> 145</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Initiating Test 3...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 146</span> assert(<a class="code hl_function" href="../../df/dce/namespacegraph.html#adc68cbc8ba09eb1142265935c0d45b84">graph::dijkstra</a>(&amp;adj2, s - 1, t - 1) == 6);</div>
<div class="line"><span class="lineno"> 147</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Test 3 Passed...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 148</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;All Test Passed...&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 149</span>}</div>
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