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<div id="Layer1" style="position:absolute; width:711px; height:21px; z-index:1; top: 10px; background-color: #CCCCCC; layer-background-color: #CCCCCC; border: 1px none #000000; left: 26px"><b>|</b><font face="宋体" size="2"><a href="../text1/text1-0.htm">第一章</a></font><b>|</b><font face="宋体" size="2"><a href="../text2/text2-0.htm">第二章</a></font><b>|</b><font face="宋体" size="2"><a href="../text3/text3-0.htm">第三章</a></font><b>|</b><font face="宋体" size="2"><a href="../text4/text4-0.htm">第四章</a></font><b>|</b><font face="宋体" size="2"><a href="../text5/text5-0.htm">第五章</a></font><b>|</b><font face="宋体" size="2"><a href="../text6/text6-0.htm">第六章</a></font><b>|</b><font face="宋体" size="2">第七章</font><b>|</b><font face="宋体" size="2"><a href="../text8/text8-0.htm">第八章</a></font><b>|</b><font face="宋体" size="2"><a href="../text9/text9-0.htm">第九章</a></font><b>|</b><font face="宋体" size="2"><a href="../text10/text10-0.htm">第十章</a></font><b>|</b><font size="2" face="宋体"><a href="../textA/textA-0.htm">算法分析</a><b><font color="#000000">|</font></b>
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<b><font face="Arial, Helvetica, sans-serif" size="5" color="#FF0000">7.2 definitions</font><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">
<font color="#0033CC">applications of sorting:</font>
1. as an aid to searching
2. for matching entries in the lists
3. finding a permutation (permutation is not unique)
<i>given:</i> a list <i>( R0,R1,…, Rn-1) </i> ( <i>Ki </i> a key value )
<img src="image/text7-b.gif" width="189" height="23">
desired ordering:
<img src="image/text7-c.gif" width="158" height="23">
<font color="#FF0000">unique permutati</font>on has the following properties:
(1) | sorted | <img src="image/text7-d.gif" width="189" height="23">
(2) | stable | if<i> i < j </i>and <i>Ki = kj </i> in the input list, then <i>Ri </i>
precedes <i>R j </i> in the sorted list
<font color="#FF0000">sorting methods:</font>
<i><font color="#0033CC"> internal sort </font></i>---- the list is small enough to sort entries in
main memory
<i><font color="#FF0000">selection sort insertion sort quick sort
heap sort merge sort radix sort</font></i>
<i><font color="#0033CC"> external sort</font></i> ---- there is too much information to fit into
main memory
</font></b></pre>
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