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<div id="projectbrief">Set of algorithms implemented in C.</div>
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<div class="title">union_find.c File Reference</div> </div>
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<p><a href="https://en.wikipedia.org/wiki/Disjoint-set_data_structure">Union find</a> algorithm.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;stdio.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for union_find.c:</div>
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Macros</h2></td></tr>
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#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/df3/union__find_8c.html#a0592dba56693fad79136250c11e5a7fe">MAX_SIZE</a>&#160;&#160;&#160;1000</td></tr>
<tr class="memdesc:a0592dba56693fad79136250c11e5a7fe"><td class="mdescLeft">&#160;</td><td class="mdescRight">maximum number of elements in the set <br /></td></tr>
<tr class="separator:a0592dba56693fad79136250c11e5a7fe"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a3e13b69cce5a1b25ae034798092f3d86"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/df3/union__find_8c.html#a3e13b69cce5a1b25ae034798092f3d86">find</a> (int *p, int x)</td></tr>
<tr class="memdesc:a3e13b69cce5a1b25ae034798092f3d86"><td class="mdescLeft">&#160;</td><td class="mdescRight">Find index of or value in an array. <a href="../../df/df3/union__find_8c.html#a3e13b69cce5a1b25ae034798092f3d86">More...</a><br /></td></tr>
<tr class="separator:a3e13b69cce5a1b25ae034798092f3d86"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af2f3ff6d98641f7d3be11f071c97908a"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/df3/union__find_8c.html#af2f3ff6d98641f7d3be11f071c97908a">join</a> (int *p, int x, int y)</td></tr>
<tr class="memdesc:af2f3ff6d98641f7d3be11f071c97908a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function to join. <a href="../../df/df3/union__find_8c.html#af2f3ff6d98641f7d3be11f071c97908a">More...</a><br /></td></tr>
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int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/df3/union__find_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <br /></td></tr>
<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><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://en.wikipedia.org/wiki/Disjoint-set_data_structure">Union find</a> algorithm. </p>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a3e13b69cce5a1b25ae034798092f3d86"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3e13b69cce5a1b25ae034798092f3d86">&#9670;&nbsp;</a></span>find()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int find </td>
<td>(</td>
<td class="paramtype">int *&#160;</td>
<td class="paramname"><em>p</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>x</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Find index of or value in an array. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in,out]</td><td class="paramname">p</td><td>array to search and update </td></tr>
<tr><td class="paramdir"></td><td class="paramname">x</td><td>value to search </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>value at the index <code>x</code> </dd></dl>
<div class="fragment"><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;{</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; <span class="keywordflow">if</span> (x &gt;= <a class="code" href="../../df/df3/union__find_8c.html#a0592dba56693fad79136250c11e5a7fe">MAX_SIZE</a>)</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160; {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; fprintf(stderr, <span class="stringliteral">&quot;Out-of bounds value\n&quot;</span>);</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; exit(EXIT_FAILURE);</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; }</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; <span class="keywordflow">if</span> (p[x] == x)</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; {</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="keywordflow">return</span> x;</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; }</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; p[x] = <a class="code" href="../../df/df3/union__find_8c.html#a3e13b69cce5a1b25ae034798092f3d86">find</a>(p, p[x]);</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; <span class="keywordflow">return</span> p[x];</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; }</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#af2f3ff6d98641f7d3be11f071c97908a">&#9670;&nbsp;</a></span>join()</h2>
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<div class="memproto">
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<td class="memname">void join </td>
<td>(</td>
<td class="paramtype">int *&#160;</td>
<td class="paramname"><em>p</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>x</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>y</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Function to join. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in,out]</td><td class="paramname">p</td><td>array to join in </td></tr>
<tr><td class="paramdir"></td><td class="paramname">x</td><td>value or index to join to </td></tr>
<tr><td class="paramdir"></td><td class="paramname">y</td><td>value or index to join from </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;{ p[<a class="code" href="../../df/df3/union__find_8c.html#a3e13b69cce5a1b25ae034798092f3d86">find</a>(p, x)] = <a class="code" href="../../df/df3/union__find_8c.html#a3e13b69cce5a1b25ae034798092f3d86">find</a>(p, y); }</div>
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<div class="ttc" id="aunion__find_8c_html_a0592dba56693fad79136250c11e5a7fe"><div class="ttname"><a href="../../df/df3/union__find_8c.html#a0592dba56693fad79136250c11e5a7fe">MAX_SIZE</a></div><div class="ttdeci">#define MAX_SIZE</div><div class="ttdoc">maximum number of elements in the set</div><div class="ttdef"><b>Definition:</b> union_find.c:8</div></div>
<div class="ttc" id="aunion__find_8c_html_a3e13b69cce5a1b25ae034798092f3d86"><div class="ttname"><a href="../../df/df3/union__find_8c.html#a3e13b69cce5a1b25ae034798092f3d86">find</a></div><div class="ttdeci">int find(int *p, int x)</div><div class="ttdoc">Find index of or value in an array.</div><div class="ttdef"><b>Definition:</b> union_find.c:17</div></div>
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