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<p><a href="https://www.coursera.org/learn/algorithms-on-graphs/lecture/7ml18/bidirectional-dijkstra">Bidirectional Dijkstra Shortest Path 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;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 bidirectional_dijkstra.cpp:</div>
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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>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:d4/d13/namespacebidirectional__dijkstra"><td class="memItemLeft" align="right" valign="top"> &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d13/namespacebidirectional__dijkstra.html">bidirectional_dijkstra</a></td></tr>
<tr class="memdesc:d4/d13/namespacebidirectional__dijkstra"><td class="mdescLeft">&#160;</td><td class="mdescRight">Functions for <a href="https://www.coursera.org/learn/algorithms-on-graphs/lecture/7ml18/bidirectional-dijkstra">Bidirectional Dijkstra Shortest Path</a> algorithm. <br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a6f92fe022b7e5d453f7257d763b6f3e2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::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; uint64_t, uint64_t &gt;&gt;&gt; *adj1, <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; uint64_t, uint64_t &gt;&gt;&gt; *adj2, uint64_t u, uint64_t v, uint64_t w)</td></tr>
<tr class="memdesc:a6f92fe022b7e5d453f7257d763b6f3e2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function that add edge between two nodes or vertices of graph. <a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">More...</a><br /></td></tr>
<tr class="separator:a6f92fe022b7e5d453f7257d763b6f3e2"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab322409d0015c023d91c67b5b2679257"><td class="memItemLeft" align="right" valign="top">uint64_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#ab322409d0015c023d91c67b5b2679257">graph::bidirectional_dijkstra::Shortest_Path_Distance</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; uint64_t &gt; &amp;workset_, const <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; uint64_t &gt;&gt; &amp;distance_)</td></tr>
<tr class="memdesc:ab322409d0015c023d91c67b5b2679257"><td class="mdescLeft">&#160;</td><td class="mdescRight">This function returns the shortest distance from the source to the target if there is path between vertices 's' and 't'. <a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#ab322409d0015c023d91c67b5b2679257">More...</a><br /></td></tr>
<tr class="separator:ab322409d0015c023d91c67b5b2679257"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa3848a7213562b47084585499d3642a5"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#aa3848a7213562b47084585499d3642a5">graph::bidirectional_dijkstra::Bidijkstra</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; uint64_t, uint64_t &gt;&gt;&gt; *adj1, <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; uint64_t, uint64_t &gt;&gt;&gt; *adj2, uint64_t s, uint64_t t)</td></tr>
<tr class="memdesc:aa3848a7213562b47084585499d3642a5"><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. <a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#aa3848a7213562b47084585499d3642a5">More...</a><br /></td></tr>
<tr class="separator:aa3848a7213562b47084585499d3642a5"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a483bb8ccf42aaf7375a83e91490eda1e"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a> ()</td></tr>
<tr class="memdesc:a483bb8ccf42aaf7375a83e91490eda1e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to test the provided algorithm above. <a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">More...</a><br /></td></tr>
<tr class="separator:a483bb8ccf42aaf7375a83e91490eda1e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">More...</a><br /></td></tr>
<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Variables</h2></td></tr>
<tr class="memitem:a330a2b0a904f01802ada1f8f3b28e76c"><td class="memItemLeft" align="right" valign="top">constexpr int64_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a330a2b0a904f01802ada1f8f3b28e76c">INF</a> = <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>
<tr class="memdesc:a330a2b0a904f01802ada1f8f3b28e76c"><td class="mdescLeft">&#160;</td><td class="mdescRight">for store the graph, the distances, and the path <a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a330a2b0a904f01802ada1f8f3b28e76c">More...</a><br /></td></tr>
<tr class="separator:a330a2b0a904f01802ada1f8f3b28e76c"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p><a href="https://www.coursera.org/learn/algorithms-on-graphs/lecture/7ml18/bidirectional-dijkstra">Bidirectional Dijkstra Shortest Path Algorithm</a> </p>
<dl class="section author"><dt>Author</dt><dd><a href="http://github.com/Marinovsky">Marinovksy</a></dd></dl>
<p>This is basically the same Dijkstra Algorithm but faster because it goes from the source to the target and from target to the source and stops when finding a vertex visited already by the direct search or the reverse one. Here some simulations of it: <a href="https://www.youtube.com/watch?v=DINCL5cd_w0&t=24s">https://www.youtube.com/watch?v=DINCL5cd_w0&amp;t=24s</a> </p>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a6f92fe022b7e5d453f7257d763b6f3e2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6f92fe022b7e5d453f7257d763b6f3e2">&#9670;&nbsp;</a></span>addEdge()</h2>
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<td class="memname">void graph::bidirectional_dijkstra::addEdge </td>
<td>(</td>
<td class="paramtype"><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; uint64_t, uint64_t &gt;&gt;&gt; *&#160;</td>
<td class="paramname"><em>adj1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><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; uint64_t, uint64_t &gt;&gt;&gt; *&#160;</td>
<td class="paramname"><em>adj2</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint64_t&#160;</td>
<td class="paramname"><em>u</em>, </td>
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<td class="paramtype">uint64_t&#160;</td>
<td class="paramname"><em>v</em>, </td>
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<td class="paramtype">uint64_t&#160;</td>
<td class="paramname"><em>w</em>&#160;</td>
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<td>)</td>
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<p>Function that add edge between two nodes or vertices of graph. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">adj1</td><td>adjacency list for the direct search </td></tr>
<tr><td class="paramname">adj2</td><td>adjacency list for the reverse search </td></tr>
<tr><td class="paramname">u</td><td>any node or vertex of graph </td></tr>
<tr><td class="paramname">v</td><td>any node or vertex of graph </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; (*adj1)[u - 1].push_back(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(v - 1, w));</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; (*adj2)[v - 1].push_back(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(u - 1, w));</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="comment">// (*adj)[v - 1].push_back(std::make_pair(u - 1, w));</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;}</div>
<div class="ttc" id="amake_pair_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a></div><div class="ttdeci">T make_pair(T... args)</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="#aa3848a7213562b47084585499d3642a5">&#9670;&nbsp;</a></span>Bidijkstra()</h2>
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<td class="memname">int graph::bidirectional_dijkstra::Bidijkstra </td>
<td>(</td>
<td class="paramtype"><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; uint64_t, uint64_t &gt;&gt;&gt; *&#160;</td>
<td class="paramname"><em>adj1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><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; uint64_t, uint64_t &gt;&gt;&gt; *&#160;</td>
<td class="paramname"><em>adj2</em>, </td>
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<td class="paramtype">uint64_t&#160;</td>
<td class="paramname"><em>s</em>, </td>
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<td class="paramtype">uint64_t&#160;</td>
<td class="paramname"><em>t</em>&#160;</td>
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<td>)</td>
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<p>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. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">adj1</td><td>input graph </td></tr>
<tr><td class="paramname">adj2</td><td>input graph reversed </td></tr>
<tr><td class="paramname">s</td><td>source vertex </td></tr>
<tr><td class="paramname">t</td><td>target vertex</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>shortest distance if target is reachable from source else -1 in case if target is not reachable from source. </dd></dl>
<p>n denotes the number of vertices in graph</p>
<p>setting all the distances initially to INF</p>
<p>creating a a vector of min heap using priority queue pq[0] contains the min heap for the direct search pq[1] contains the min heap for the reverse search</p>
<p>first element of pair contains the distance second element of pair contains the vertex</p>
<p>vector for store the nodes or vertices in the shortest path</p>
<p>vector for store the nodes or vertices visited</p>
<p>pushing the source vertex 's' with 0 distance in pq[0] min heap</p>
<p>marking the distance of source as 0</p>
<p>pushing the target vertex 't' with 0 distance in pq[1] min heap</p>
<p>marking the distance of target as 0</p>
<p>direct search</p>
<p>second element of pair denotes the node / vertex</p>
<p>first element of pair denotes the distance</p>
<p>for all the reachable vertex from the currently exploring vertex we will try to minimize the distance</p>
<p>minimizing distances</p>
<p>check if currentNode has already been visited</p>
<p>reversed search</p>
<p>second element of pair denotes the node / vertex</p>
<p>first element of pair denotes the distance</p>
<p>for all the reachable vertex from the currently exploring vertex we will try to minimize the distance</p>
<p>minimizing distances</p>
<p>check if currentNode has already been visited</p>
<div class="fragment"><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; {<span class="comment"></span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="comment"> /// n denotes the number of vertices in graph</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="comment"></span> uint64_t n = adj1-&gt;<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>();</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;<span class="comment"> /// setting all the distances initially to INF</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;<span class="comment"></span> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;uint64_t&gt;</a>&gt; dist(2, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;uint64_t&gt;</a>(n, <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a330a2b0a904f01802ada1f8f3b28e76c">INF</a>));</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;<span class="comment"> /// creating a a vector of min heap using priority queue</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;<span class="comment"> /// pq[0] contains the min heap for the direct search</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;<span class="comment"> /// pq[1] contains the min heap for the reverse search</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160;<span class="comment"></span><span class="comment"></span> </div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;<span class="comment"> /// first element of pair contains the distance</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;<span class="comment"> /// second element of pair contains the vertex</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;<span class="comment"></span> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/priority_queue.html">std::priority_queue&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>,</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;,</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/functional/greater.html">std::greater&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;&gt;&gt;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; pq(2);<span class="comment"></span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;<span class="comment"> /// vector for store the nodes or vertices in the shortest path</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;<span class="comment"></span> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;uint64_t&gt;</a> workset(n);<span class="comment"></span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;<span class="comment"> /// vector for store the nodes or vertices visited</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;<span class="comment"></span> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;bool&gt;</a> visited(n);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;<span class="comment"> /// pushing the source vertex &#39;s&#39; with 0 distance in pq[0] min heap</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;<span class="comment"></span> pq[0].push(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(0, s));</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;<span class="comment"> /// marking the distance of source as 0</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;<span class="comment"></span> dist[0][s] = 0;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;<span class="comment"> /// pushing the target vertex &#39;t&#39; with 0 distance in pq[1] min heap</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;<span class="comment"></span> pq[1].push(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(0, t));</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;<span class="comment"> /// marking the distance of target as 0</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;<span class="comment"></span> dist[1][t] = 0;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; </div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="keywordflow">while</span> (<span class="keyword">true</span>) {<span class="comment"></span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;<span class="comment"> /// direct search</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="comment">// If pq[0].size() is equal to zero then the node/ vertex is not</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="comment">// reachable from s</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="keywordflow">if</span> (pq[0].size() == 0) {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; }<span class="comment"></span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;<span class="comment"> /// second element of pair denotes the node / vertex</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160;<span class="comment"></span> uint64_t currentNode = pq[0].top().second;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160;<span class="comment"> /// first element of pair denotes the distance</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;<span class="comment"></span> uint64_t currentDist = pq[0].top().first;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; pq[0].pop();</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;<span class="comment"> /// for all the reachable vertex from the currently exploring vertex</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;<span class="comment"> /// we will try to minimize the distance</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160;<span class="comment"></span> <span class="keywordflow">for</span> (<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;int, int&gt;</a> edge : (*adj1)[currentNode]) {<span class="comment"></span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160;<span class="comment"> /// minimizing distances</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160;<span class="comment"></span> <span class="keywordflow">if</span> (currentDist + edge.second &lt; dist[0][edge.first]) {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; dist[0][edge.first] = currentDist + edge.second;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; pq[0].push(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(dist[0][edge.first], edge.first));</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; }</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; }</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; <span class="comment">// store the processed node/ vertex</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; workset.push_back(currentNode);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160;<span class="comment"> /// check if currentNode has already been visited</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160;<span class="comment"></span> <span class="keywordflow">if</span> (visited[currentNode] == 1) {</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#ab322409d0015c023d91c67b5b2679257">Shortest_Path_Distance</a>(workset, dist);</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; }</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; visited[currentNode] = <span class="keyword">true</span>;<span class="comment"></span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160;<span class="comment"> /// reversed search</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; <span class="comment">// If pq[1].size() is equal to zero then the node/ vertex is not</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; <span class="comment">// reachable from t</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keywordflow">if</span> (pq[1].size() == 0) {</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; }<span class="comment"></span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160;<span class="comment"> /// second element of pair denotes the node / vertex</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;<span class="comment"></span> currentNode = pq[1].top().second;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160;<span class="comment"> /// first element of pair denotes the distance</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160;<span class="comment"></span> currentDist = pq[1].top().first;</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; </div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; pq[1].pop();</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160;<span class="comment"> /// for all the reachable vertex from the currently exploring vertex</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160;<span class="comment"> /// we will try to minimize the distance</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;<span class="comment"></span> <span class="keywordflow">for</span> (<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;int, int&gt;</a> edge : (*adj2)[currentNode]) {<span class="comment"></span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;<span class="comment"> /// minimizing distances</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160;<span class="comment"></span> <span class="keywordflow">if</span> (currentDist + edge.second &lt; dist[1][edge.first]) {</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; dist[1][edge.first] = currentDist + edge.second;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; pq[1].push(<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(dist[1][edge.first], edge.first));</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; }</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; }</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160; <span class="comment">// store the processed node/ vertex</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; workset.push_back(currentNode);</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;<span class="comment"> /// check if currentNode has already been visited</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;<span class="comment"></span> <span class="keywordflow">if</span> (visited[currentNode] == 1) {</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#ab322409d0015c023d91c67b5b2679257">Shortest_Path_Distance</a>(workset, dist);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; }</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; visited[currentNode] = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; }</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160;}</div>
<div class="ttc" id="abidirectional__dijkstra_8cpp_html_a330a2b0a904f01802ada1f8f3b28e76c"><div class="ttname"><a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a330a2b0a904f01802ada1f8f3b28e76c">INF</a></div><div class="ttdeci">constexpr int64_t INF</div><div class="ttdoc">for store the graph, the distances, and the path</div><div class="ttdef"><b>Definition:</b> bidirectional_dijkstra.cpp:23</div></div>
<div class="ttc" id="abidirectional__dijkstra_8cpp_html_ab322409d0015c023d91c67b5b2679257"><div class="ttname"><a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#ab322409d0015c023d91c67b5b2679257">graph::bidirectional_dijkstra::Shortest_Path_Distance</a></div><div class="ttdeci">uint64_t Shortest_Path_Distance(const std::vector&lt; uint64_t &gt; &amp;workset_, const std::vector&lt; std::vector&lt; uint64_t &gt;&gt; &amp;distance_)</div><div class="ttdoc">This function returns the shortest distance from the source to the target if there is path between ve...</div><div class="ttdef"><b>Definition:</b> bidirectional_dijkstra.cpp:61</div></div>
<div class="ttc" id="agreater_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/functional/greater.html">std::greater</a></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="apriority_queue_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/priority_queue.html">std::priority_queue</a></div></div>
<div class="ttc" id="asize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector/size.html">std::vector::size</a></div><div class="ttdeci">T size(T... args)</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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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&nbsp;</a></span>main()</h2>
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<td class="memname">int main </td>
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<p>Main function. </p>
<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
<div class="fragment"><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160; {</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>(); <span class="comment">// running predefined tests</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>&#160; uint64_t vertices = uint64_t();</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>&#160; uint64_t edges = uint64_t();</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>&#160; <a class="codeRef" 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"><a name="l00253"></a><span class="lineno"> 253</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a> &gt;&gt; vertices;</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>&#160; <a class="codeRef" 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"><a name="l00255"></a><span class="lineno"> 255</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a> &gt;&gt; edges;</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>&#160; </div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;&gt; adj1(</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>&#160; vertices, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;());</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;&gt; adj2(</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>&#160; vertices, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;());</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>&#160; </div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>&#160; uint64_t u = uint64_t(), v = uint64_t(), w = uint64_t();</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Enter the edges by three integers in this form: u v w &quot;</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>&#160; &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Example: if there is and edge between node 1 and node 4 with &quot;</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>&#160; <span class="stringliteral">&quot;weight 7 enter: 1 4 7, and then press enter&quot;</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>&#160; &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>&#160; <span class="keywordflow">while</span> (edges--) {</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>&#160; <a class="codeRef" 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"><a name="l00270"></a><span class="lineno"> 270</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj1, &amp;adj2, u, v, w);</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>&#160; <span class="keywordflow">if</span> (edges != 0) {</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Enter the next edge&quot;</span> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>&#160; }</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>&#160; }</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>&#160; </div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>&#160; uint64_t s = uint64_t(), t = uint64_t();</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>&#160; &lt;&lt; <span class="stringliteral">&quot;Enter the source node and the target node separated by a space&quot;</span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>&#160; &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Example: If the source node is 5 and the target node is 6 &quot;</span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>&#160; <span class="stringliteral">&quot;enter: 5 6 and press enter&quot;</span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>&#160; &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>&#160; <a class="codeRef" 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"><a name="l00284"></a><span class="lineno"> 284</span>&#160; <span class="keywordtype">int</span> dist =</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#aa3848a7213562b47084585499d3642a5">graph::bidirectional_dijkstra::Bidijkstra</a>(&amp;adj1, &amp;adj2, s - 1, t - 1);</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>&#160; <span class="keywordflow">if</span> (dist == -1) {</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>&#160; }</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>&#160; </div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>&#160;}</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="abidirectional__dijkstra_8cpp_html_a483bb8ccf42aaf7375a83e91490eda1e"><div class="ttname"><a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a></div><div class="ttdeci">static void tests()</div><div class="ttdoc">Function to test the provided algorithm above.</div><div class="ttdef"><b>Definition:</b> bidirectional_dijkstra.cpp:199</div></div>
<div class="ttc" id="abidirectional__dijkstra_8cpp_html_a6f92fe022b7e5d453f7257d763b6f3e2"><div class="ttname"><a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a></div><div class="ttdeci">void addEdge(std::vector&lt; std::vector&lt; std::pair&lt; uint64_t, uint64_t &gt;&gt;&gt; *adj1, std::vector&lt; std::vector&lt; std::pair&lt; uint64_t, uint64_t &gt;&gt;&gt; *adj2, uint64_t u, uint64_t v, uint64_t w)</div><div class="ttdoc">Function that add edge between two nodes or vertices of graph.</div><div class="ttdef"><b>Definition:</b> bidirectional_dijkstra.cpp:45</div></div>
<div class="ttc" id="abidirectional__dijkstra_8cpp_html_aa3848a7213562b47084585499d3642a5"><div class="ttname"><a href="../../d7/d07/bidirectional__dijkstra_8cpp.html#aa3848a7213562b47084585499d3642a5">graph::bidirectional_dijkstra::Bidijkstra</a></div><div class="ttdeci">int Bidijkstra(std::vector&lt; std::vector&lt; std::pair&lt; uint64_t, uint64_t &gt;&gt;&gt; *adj1, std::vector&lt; std::vector&lt; std::pair&lt; uint64_t, uint64_t &gt;&gt;&gt; *adj2, uint64_t s, uint64_t 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> bidirectional_dijkstra.cpp:86</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>
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<h2 class="memtitle"><span class="permalink"><a href="#ab322409d0015c023d91c67b5b2679257">&#9670;&nbsp;</a></span>Shortest_Path_Distance()</h2>
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<td class="memname">uint64_t graph::bidirectional_dijkstra::Shortest_Path_Distance </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; uint64_t &gt; &amp;&#160;</td>
<td class="paramname"><em>workset_</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <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; uint64_t &gt;&gt; &amp;&#160;</td>
<td class="paramname"><em>distance_</em>&#160;</td>
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<p>This function returns the shortest distance from the source to the target if there is path between vertices 's' and 't'. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">workset_</td><td>vertices visited in the search </td></tr>
<tr><td class="paramname">distance_</td><td>vector of distances from the source to the target and from the target to the source </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; int64_t <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/distance.html">distance</a> = <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a330a2b0a904f01802ada1f8f3b28e76c">INF</a>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">for</span> (uint64_t i : workset_) {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordflow">if</span> (distance_[0][i] + distance_[1][i] &lt; distance) {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/distance.html">distance</a> = distance_[0][i] + distance_[1][i];</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; }</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; }</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordflow">return</span> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/distance.html">distance</a>;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;}</div>
<div class="ttc" id="adistance_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/iterator/distance.html">std::distance</a></div><div class="ttdeci">T distance(T... args)</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a483bb8ccf42aaf7375a83e91490eda1e">&#9670;&nbsp;</a></span>tests()</h2>
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<td class="memname">static void tests </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Function to test the provided algorithm above. </p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<div class="fragment"><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; {</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;&gt; adj1_1(</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; 4, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;());</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;&gt; adj1_2(</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; 4, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;());</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj1_1, &amp;adj1_2, 1, 2, 1);</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj1_1, &amp;adj1_2, 4, 1, 2);</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj1_1, &amp;adj1_2, 2, 3, 2);</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj1_1, &amp;adj1_2, 1, 3, 5);</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160; </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160; uint64_t s = 1, t = 3;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160; assert(graph::bidirectional_dijkstra::Bidijkstra(&amp;adj1_1, &amp;adj1_2, s - 1,</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160; t - 1) == 3);</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; s = 4, t = 3;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; assert(graph::bidirectional_dijkstra::Bidijkstra(&amp;adj1_1, &amp;adj1_2, s - 1,</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; t - 1) == 5);</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160; </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;&gt; adj2_1(</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160; 5, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;());</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;std::vector&lt;std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;&gt; adj2_2(</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160; 5, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt;<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;uint64_t, uint64_t&gt;</a>&gt;());</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 1, 2, 4);</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 1, 3, 2);</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 2, 3, 2);</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 3, 2, 1);</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 2, 4, 2);</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 3, 5, 4);</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 5, 4, 1);</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 2, 5, 3);</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160; <a class="code" href="../../d7/d07/bidirectional__dijkstra_8cpp.html#a6f92fe022b7e5d453f7257d763b6f3e2">graph::bidirectional_dijkstra::addEdge</a>(&amp;adj2_1, &amp;adj2_2, 3, 4, 4);</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160; </div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160; s = 1, t = 5;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160; assert(graph::bidirectional_dijkstra::Bidijkstra(&amp;adj2_1, &amp;adj2_2, s - 1,</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160; t - 1) == 6);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160; <a class="codeRef" 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="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160;}</div>
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<h2 class="groupheader">Variable Documentation</h2>
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<td class="memname">constexpr int64_t INF = <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>
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<p>for store the graph, the distances, and the path </p>
<p>for assert for io operations for variable INF for the priority_queue of distances for make_pair function </p>
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