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<title>贪婪（贪心）算法 Greedy Algorithm </title>
<meta name=Description content="2005/9/19: 1.3.3 选择精确或者近似的算法 ">
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<div v:shape="_x0000_s126978" class=T style='position:absolute;top:9.0%;
left:14.41%;width:99.25%;height:9.25%'><span lang=ZH-CN style='font-family:
"Times New Roman";mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
Verdana;mso-ansi-language:EN-US'>1.3.3<span style="mso-spacerun: yes">
</span></span><span lang=ZH-CN style='font-family:方正书宋简体;mso-fareast-font-family:
方正书宋简体;mso-ansi-language:EN-US'>选择精确或者近似的算法</span><span lang=ZH-CN
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:Verdana;mso-ansi-language:EN-US'> </span></div>
<div v:shape="_x0000_s126979" class=B><span style='position:absolute;
top:25.0%;left:18.16%;width:90.82%'><span style='mso-special-format:bullet;
color:#FFCC66;mso-color-index:3;position:absolute;left:-4.12%;top:.1em;
font-family:Symbol;font-size:90%'>¨</span><span lang=ZH-CN style='font-family:
方正书宋简体;mso-fareast-font-family:方正书宋简体;mso-ansi-language:EN-US'>解决问题下一步要考虑的是使用精确的</span></span><span
style='position:absolute;top:32.25%;left:18.16%;width:90.82%'><span
lang=ZH-CN style='font-family:方正书宋简体;mso-fareast-font-family:方正书宋简体;
mso-ansi-language:EN-US'>还是近似的算法。并不是每一个可解的</span></span><span
style='position:absolute;top:39.25%;left:18.16%;width:90.82%'><span
lang=ZH-CN style='font-family:方正书宋简体;mso-fareast-font-family:方正书宋简体;
mso-ansi-language:EN-US'>问题都有精确的算法，例如求一个数的</span></span><span
style='position:absolute;top:46.25%;left:18.16%;width:90.82%'><span
lang=ZH-CN style='font-family:方正书宋简体;mso-fareast-font-family:方正书宋简体;
mso-ansi-language:EN-US'>平方根，求非线性方程的解等。有时候</span></span><span
style='position:absolute;top:53.5%;left:18.16%;width:90.82%'><span lang=ZH-CN
style='font-family:方正书宋简体;mso-fareast-font-family:方正书宋简体;mso-ansi-language:
EN-US'>一个问题有精确的解法但是算法的执行</span></span><span style='position:absolute;
top:60.5%;left:18.16%;width:90.82%'><span lang=ZH-CN style='font-family:方正书宋简体;
mso-fareast-font-family:方正书宋简体;mso-ansi-language:EN-US'>效率很差，例如旅行家问题。因此如果</span></span><span
style='position:absolute;top:67.75%;left:18.16%;width:90.82%'><span
lang=ZH-CN style='font-family:方正书宋简体;mso-fareast-font-family:方正书宋简体;
mso-ansi-language:EN-US'>待处理的问题涉及到上述那些方面，则</span></span><span
style='position:absolute;top:74.25%;left:18.16%;width:90.82%'><span
lang=ZH-CN style='font-family:方正书宋简体;mso-fareast-font-family:方正书宋简体;
mso-ansi-language:EN-US'>要考虑是选择精确的还是近似的算法。</span><span lang=ZH-CN
style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:Verdana;mso-ansi-language:EN-US'> </span></span></div>
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