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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"><a href="../text7/text7-0.htm">第七章</a></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">算法分析<b><font color="#000000">|</font></b>
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<b><font face="宋体" size="4" color="#FF0033">
<font size="5">1.4 回溯法</font></font><font face="宋体" size="4" color="#000000">
<font color="#FF0033">基本思想</font>--若已有满足约束条件的部分解，设为<i><font face="Arial, Helvetica, sans-serif">（x1, x2, … xi）, i < n, </font></i>
则添加 x<font size="2">i+1</font><img src="IMAGE/belong.gif" width="13" height="12" align="middle">S<font size="2">i+1</font>。查<i><font face="Arial, Helvetica, sans-serif">（x1,x2,…xi ，xi+1）</font></i>是否满足约束条件。
如满足再添加.如不满足，回溯到上个部分解<i><font face="Arial, Helvetica, sans-serif">（x1,x2,…，xi-1 ）</font></i>
，反复之，得到解或证明无解。
<font color="#0033CC">例4.1</font> 八皇后问题
</font></b><img src="IMAGE/text10-g.gif" width="667" height="246"></pre>
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