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📁 一些算法小技巧 有利于学习C语言 在C语言和JAVA中都可以用的
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<title>贪婪（贪心）算法 Greedy Algorithm </title>
<meta name=Description content="2005/9/19: 2.4.3 换名 ：">
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 <div v:shape="_x0000_s79874" class=T style='position:absolute;top:9.0%;
 left:14.41%;width:83.14%;height:9.25%'><span lang=ZH-CN style='font-family:
 "Times New Roman";mso-ascii-font-family:"Times New Roman";color:yellow;
 mso-ansi-language:EN-US'>2.4.3 </span><span lang=ZH-CN style='color:yellow;
 mso-ansi-language:EN-US'>换名</span><span lang=ZH-CN style='font-family:"Times New Roman";
 mso-ascii-font-family:"Times New Roman";color:yellow;mso-ansi-language:EN-US'>
 </span><span lang=ZH-CN style='color:yellow;mso-ansi-language:EN-US'>：</span></div>
 <div v:shape="_x0000_s79875" class=B>
 <div style='mso-line-spacing:"90 20 0";position:absolute;top:23.75%;
 left:14.41%;width:83.14%;height:6.75%'><span style='mso-special-format:nobullet;
 display:none;font-family:Symbol;font-size:90%'>¨</span><span lang=ZH-CN
 style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 color:#FFCC66;mso-color-index:3;mso-ansi-language:EN-US'><span
 style='mso-tab-count:1;width:4.51%'> </span></span><span lang=ZH-CN
 style='color:#FFCC66;mso-color-index:3;mso-ansi-language:EN-US'>同高数的换元法</span><span
 lang=ZH-CN style='font-size:56%;color:#FFCC66;mso-color-index:3;mso-ansi-language:
 EN-US;display:none'>&#13;</span></div>
 <div style='mso-line-spacing:"90 20 0";position:absolute;top:32.25%;
 left:14.41%;width:83.14%;height:6.25%'><span style='position:absolute;
 top:0%;left:4.5%;width:95.49%'><span style='color:yellow'><span
 style='mso-special-format:bullet;color:#FFCC66;mso-color-index:3;position:
 absolute;left:-4.71%;top:.1em;font-family:Symbol;font-size:90%'>¨</span></span><span
 lang=ZH-CN style='color:yellow;mso-ansi-language:EN-US'>优点：&#13;</span></span></div>
 <div style='mso-line-spacing:"90 20 0"'><span style='position:absolute;
 top:39.5%;left:14.41%;width:98.12%'><span style='mso-special-format:nobullet;
 display:none;color:#FFCC66;mso-color-index:3;font-family:Symbol;font-size:
 90%'>¨</span><span lang=ZH-CN style='font-family:"Times New Roman";mso-ascii-font-family:
 "Times New Roman";color:yellow;mso-ansi-language:EN-US'><span
 style='mso-tab-count:1;width:3.82%'> </span></span><span lang=ZH-CN
 style='font-size:88%;mso-ansi-language:EN-US'>作变元的替换有时会使一个末知其解的递归方</span></span><span
 style='position:absolute;top:46.25%;left:18.16%;width:93.63%'><span
 lang=ZH-CN style='font-size:88%;mso-ansi-language:EN-US'>程变成类似于你曾见过的已知其解的方程，从</span></span><span
 style='position:absolute;top:52.0%;left:18.16%;width:93.63%'><span lang=ZH-CN
 style='font-size:88%;mso-ansi-language:EN-US'>而使得只要将变换后的方程的正确解的变元作</span></span><span
 style='position:absolute;top:57.5%;left:18.16%;width:79.4%'><span lang=ZH-CN
 style='font-size:88%;mso-ansi-language:EN-US'>逆变换，便可得到所需要的解。&#13;</span></span></div>
 <div style='mso-line-spacing:"90 20 0";position:absolute;top:64.0%;left:14.41%;
 width:83.14%;height:6.75%'><span style='position:absolute;top:0%;left:4.5%;
 width:95.49%'><span style='color:yellow'><span style='mso-special-format:bullet;
 color:#FFCC66;mso-color-index:3;position:absolute;left:-4.71%;top:.1em;
 font-family:Symbol;font-size:90%'>¨</span></span><span lang=ZH-CN
 style='color:yellow;mso-ansi-language:EN-US'>如例</span><span lang=ZH-CN
 style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 color:yellow;mso-ansi-language:EN-US'>2.11</span><span lang=ZH-CN
 style='color:yellow;mso-ansi-language:EN-US'>、</span><span lang=ZH-CN
 style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 color:yellow;mso-ansi-language:EN-US'>2.12</span><span lang=ZH-CN
 style='color:yellow;mso-ansi-language:EN-US'>：&#13;</span></span></div>
 <div style='mso-line-spacing:"90 20 0"'><span style='position:absolute;
 top:71.75%;left:14.41%;width:93.44%'><span style='mso-special-format:nobullet;
 display:none;color:#FFCC66;mso-color-index:3;font-family:Symbol;font-size:
 90%'>¨</span><span lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:
 宋体;font-size:88%;mso-ansi-language:EN-US'><span style='mso-tab-count:1;
 width:4.01%'> </span></span><span lang=ZH-CN style='mso-ascii-font-family:
 宋体;font-size:88%;mso-ansi-language:EN-US'>将</span><span lang=EN-US
 style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;mso-fareast-language:
 ZH-CN'>n/2</span><span lang=EN-US style='mso-ascii-font-family:宋体;font-size:
 88%;mso-fareast-language:ZH-CN'>，</span><span lang=EN-US style='font-family:
 宋体;mso-ascii-font-family:宋体;font-size:88%;mso-fareast-language:ZH-CN'>n/3</span><span
 lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:宋体;
 mso-hansi-font-family:"Times New Roman";font-size:88%;mso-fareast-language:
 ZH-CN'>……</span><span lang=ZH-CN style='mso-ascii-font-family:宋体;font-size:
 88%;mso-ansi-language:EN-US'>用换名法替换成熟悉的（n-</span></span><span
 style='position:absolute;top:77.25%;left:18.16%;width:79.4%'><span lang=EN-US
 style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;mso-fareast-language:
 ZH-CN'>1</span><span lang=EN-US style='mso-ascii-font-family:宋体;font-size:
 88%;mso-fareast-language:ZH-CN'>），</span><span lang=EN-US style='font-family:
 宋体;mso-ascii-font-family:宋体;font-size:88%;mso-fareast-language:ZH-CN'>(n-2)</span><span
 lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:宋体;
 mso-hansi-font-family:"Times New Roman";font-size:88%;mso-fareast-language:
 ZH-CN'>……</span><span lang=ZH-CN style='mso-ascii-font-family:宋体;font-size:
 88%;mso-ansi-language:EN-US'>等形式。</span><span lang=ZH-CN style='color:yellow;
 mso-ansi-language:EN-US;display:none'>&#13;</span></span></div>
 <div style='mso-line-spacing:"90 20 0";position:absolute;top:85.0%;left:14.41%;
 width:83.14%;height:6.25%'><span style='position:absolute;top:0%;left:4.5%;
 width:95.49%'><span style='color:yellow'><span style='mso-special-format:bullet;
 color:#FFCC66;mso-color-index:3;position:absolute;left:-4.71%;top:.1em;
 font-family:Symbol;font-size:90%'>¨</span></span><span lang=ZH-CN
 style='color:yellow;mso-ansi-language:EN-US'>换元起到桥梁的作用。&#13;</span></span></div>
 <div style='mso-line-spacing:"90 20 0";position:absolute;top:92.25%;
 left:14.41%;width:83.14%;height:6.75%'><span style='mso-special-format:nobullet;
 display:none;color:#FFCC66;mso-color-index:3;font-family:Symbol;font-size:
 90%'>¨</span><span lang=ZH-CN style='font-family:"Times New Roman";mso-ascii-font-family:
 "Times New Roman";color:yellow;mso-ansi-language:EN-US'><span
 style='mso-tab-count:1;width:4.51%'> </span></span><span lang=ZH-CN
 style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 mso-ansi-language:EN-US'><span style='mso-tab-count:1;width:7.51%'> </span></span></div>
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