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<font face="Arial, Helvetica, sans-serif" size="5" color="#FF0000"><b>5.8 Selection trees</b></font><b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">
<font color="#FF0000">goal</font> --- k ordered sequences ( run ) are to be merged into a
single ordered sequence ( n records)
O(<img src="IMAGE/log2n.gif" width="61" height="24" align="middle"> )
<font color="#FF0000">selection tree</font> ---- a binary tree where each node represents
the smaller of its two children
<font color="#FF0000">tournament algorithm </font> O(n <img src="IMAGE/log2n.gif" width="61" height="24" align="middle"> )
<i><font color="#0033CC">leaf node</font></i> ~ the first record in the corresponding run
<font color="#0033CC"><i>nonleaf node</i></font> ~ the winner of a tournament
<i><font color="#0033CC">root</font></i> ~ the overall winner or smallest key</font></b>
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