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mxUnionFind (mxGraph 2.2.0.2 API Specification)
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com.mxgraph.analysis</FONT>
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Class mxUnionFind</H2>
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<PRE>
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<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
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<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.mxgraph.analysis.mxUnionFind</B>
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</PRE>
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<HR>
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<DL>
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<DT><PRE>public class <B>mxUnionFind</B><DT>extends <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
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</PRE>
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<P>
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Implements a union find structure that uses union by rank and path
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compression. The union by rank guarantees worst case find time of O(log N),
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while Tarjan shows that in combination with path compression (halving) the
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average time for an arbitrary sequence of m >= n operations is
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O(m*alpha(m,n)), where alpha is the inverse of the Ackermann function,
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defined as follows:
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<code>alpha(m,n) = min{i >= 1 | A(i, floor(m/n)) > log n} for m >= n >= 1</code>
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Which yields almost constant time for each individual operation.
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<P>
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<!-- ======== NESTED CLASS SUMMARY ======== -->
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Nested Class Summary</B></FONT></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> class</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A></B></CODE>
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<BR>
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A class that defines the identity of a set.</TD>
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</TR>
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</TABLE>
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<!-- =========== FIELD SUMMARY =========== -->
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<A NAME="field_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Field Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>protected <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A><<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>,<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A>></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../com/mxgraph/analysis/mxUnionFind.html#nodes">nodes</A></B></CODE>
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<BR>
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Maps from elements to nodes</TD>
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</TR>
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</TABLE>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<A NAME="constructor_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Constructor Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE><B><A HREF="../../../com/mxgraph/analysis/mxUnionFind.html#mxUnionFind(java.lang.Object[])">mxUnionFind</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>[] elements)</CODE>
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<BR>
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Constructs a union find structure and initializes it with the specified
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elements.</TD>
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</TR>
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</TABLE>
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<!-- ========== METHOD SUMMARY =========== -->
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<A NAME="method_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Method Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> boolean</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../com/mxgraph/analysis/mxUnionFind.html#differ(java.lang.Object, java.lang.Object)">differ</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> a,
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<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> b)</CODE>
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<BR>
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Returns true if element a and element b are not in the same set.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> <A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../com/mxgraph/analysis/mxUnionFind.html#find(com.mxgraph.analysis.mxUnionFind.Node)">find</A></B>(<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> node)</CODE>
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<BR>
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Returns the set that contains <code>node</code>.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> <A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../com/mxgraph/analysis/mxUnionFind.html#getNode(java.lang.Object)">getNode</A></B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> element)</CODE>
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<BR>
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Returns the node that represents element.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../com/mxgraph/analysis/mxUnionFind.html#union(com.mxgraph.analysis.mxUnionFind.Node, com.mxgraph.analysis.mxUnionFind.Node)">union</A></B>(<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> a,
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<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> b)</CODE>
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<BR>
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Unifies the sets <code>a</code> and <code>b</code> in constant time
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using a union by rank on the tree size.</TD>
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</TR>
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</TABLE>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE><A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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</TR>
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</TABLE>
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<P>
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<!-- ============ FIELD DETAIL =========== -->
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<A NAME="field_detail"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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<B>Field Detail</B></FONT></TH>
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</TR>
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</TABLE>
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<A NAME="nodes"><!-- --></A><H3>
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nodes</H3>
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<PRE>
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protected <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A><<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>,<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A>> <B>nodes</B></PRE>
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<DL>
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<DD>Maps from elements to nodes
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<P>
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<DL>
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</DL>
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</DL>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="constructor_detail"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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<B>Constructor Detail</B></FONT></TH>
|
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</TR>
|
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</TABLE>
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<A NAME="mxUnionFind(java.lang.Object[])"><!-- --></A><H3>
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mxUnionFind</H3>
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<PRE>
|
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public <B>mxUnionFind</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>[] elements)</PRE>
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<DL>
|
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<DD>Constructs a union find structure and initializes it with the specified
|
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elements.
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<P>
|
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<DL>
|
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<DT><B>Parameters:</B><DD><CODE>elements</CODE> - </DL>
|
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</DL>
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<!-- ============ METHOD DETAIL ========== -->
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<A NAME="method_detail"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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<B>Method Detail</B></FONT></TH>
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</TR>
|
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</TABLE>
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<A NAME="getNode(java.lang.Object)"><!-- --></A><H3>
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getNode</H3>
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<PRE>
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public <A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> <B>getNode</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> element)</PRE>
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<DL>
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<DD>Returns the node that represents element.
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<P>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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|
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<A NAME="find(com.mxgraph.analysis.mxUnionFind.Node)"><!-- --></A><H3>
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find</H3>
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<PRE>
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public <A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> <B>find</B>(<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> node)</PRE>
|
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<DL>
|
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<DD>Returns the set that contains <code>node</code>. This implementation
|
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provides path compression by halving.
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<P>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="union(com.mxgraph.analysis.mxUnionFind.Node, com.mxgraph.analysis.mxUnionFind.Node)"><!-- --></A><H3>
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union</H3>
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<PRE>
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public void <B>union</B>(<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> a,
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<A HREF="../../../com/mxgraph/analysis/mxUnionFind.Node.html" title="class in com.mxgraph.analysis">mxUnionFind.Node</A> b)</PRE>
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<DL>
|
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<DD>Unifies the sets <code>a</code> and <code>b</code> in constant time
|
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using a union by rank on the tree size.
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<P>
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<DD><DL>
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</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="differ(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
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differ</H3>
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<PRE>
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public boolean <B>differ</B>(<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> a,
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<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> b)</PRE>
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<DL>
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<DD>Returns true if element a and element b are not in the same set. This
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uses getNode and then find to determine the elements set.
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<P>
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<DD><DL>
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<DT><B>Parameters:</B><DD><CODE>a</CODE> - The first element to compare.<DD><CODE>b</CODE> - The second element to compare.
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<DT><B>Returns:</B><DD>Returns true if a and b are in the same set.<DT><B>See Also:</B><DD><A HREF="../../../com/mxgraph/analysis/mxUnionFind.html#getNode(java.lang.Object)"><CODE>getNode(Object)</CODE></A></DL>
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