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<title>贪婪（贪心）算法 Greedy Algorithm </title>
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<div v:shape="_x0000_s71682" class=T style='position:absolute;top:9.0%;
left:14.41%;width:84.45%;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'>2.2.1 </span><span lang=ZH-CN style='color:yellow;
mso-ansi-language:EN-US'>生成函数及其性质</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_s71683" class=B>
<div style='position:absolute;top:25.0%;left:14.41%;width:83.14%;height:6.25%'><span
style='position:absolute;top:0%;left:4.5%;width:95.49%'><span
style='font-family:宋体;color:#FFCC66;mso-color-index:3'><span style='mso-special-format:
bullet;position:absolute;left:-4.71%;top:.1em;font-family:Symbol;font-size:
90%'>¨</span></span><span lang=ZH-CN style='mso-ascii-font-family:宋体;
color:#FFCC66;mso-color-index:3;mso-ansi-language:EN-US'>生成函数的定义： </span></span></div>
<div style='position:absolute;top:33.5%;left:14.41%;width:83.14%;height:6.25%'><span
style='mso-special-format:nobullet;display:none;font-family:Symbol;font-size:
90%'>¨</span><span lang=ZH-CN style='font-family:宋体;mso-ascii-font-family:
宋体;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='mso-ascii-font-family:宋体;font-size:88%;mso-ansi-language:EN-US'>设序列{</span><span
lang=EN-US style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;
mso-fareast-language:ZH-CN'><i>an</i></span><span lang=EN-US style='font-family:
宋体;mso-ascii-font-family:宋体;font-size:88%;mso-fareast-language:ZH-CN'>}，构造形式幂级数 </span></div>
<div style='position:absolute;top:41.25%;left:14.41%;width:98.68%;height:6.0%'><span
style='mso-special-format:nobullet;display:none;color:#FFCC66;mso-color-index:
3;font-family:Symbol;font-size:90%'>¨</span><span lang=EN-US style='font-family:
宋体;mso-ascii-font-family:宋体;font-size:88%;mso-fareast-language:ZH-CN'><i><span
style='mso-tab-count:2;width:10.13%'> </span>G</i></span><span lang=EN-US
style='font-family:宋体;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'><i>x</i></span><span lang=EN-US
style='font-family:宋体;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'><i>a</i></span><span lang=EN-US
style='font-family:宋体;mso-ascii-font-family:宋体;font-size:59%;position:relative;
top:-.45em;mso-text-raise:30%;mso-fareast-language:ZH-CN'>0</span><span
lang=EN-US style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;
mso-fareast-language:ZH-CN'><span style="mso-spacerun: yes"> </span>+ </span><span
lang=EN-US style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;
mso-fareast-language:ZH-CN'><i>a</i></span><span lang=EN-US style='font-family:
宋体;mso-ascii-font-family:宋体;font-size:59%;position:relative;top:-.45em;
mso-text-raise:30%;mso-fareast-language:ZH-CN'>1</span><span lang=EN-US
style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;mso-fareast-language:
ZH-CN'><i>x </i></span><span lang=EN-US style='font-family:宋体;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'><i>a</i></span><span lang=EN-US style='font-family:宋体;mso-ascii-font-family:
宋体;font-size:59%;position:relative;top:-.45em;mso-text-raise:30%;mso-fareast-language:
ZH-CN'>2</span><span lang=EN-US style='font-family:宋体;mso-ascii-font-family:
宋体;font-size:88%;mso-fareast-language:ZH-CN'><i>x</i></span><span lang=EN-US
style='font-family:宋体;mso-ascii-font-family:宋体;font-size:59%;position:relative;
top:-.45em;mso-text-raise:30%;mso-fareast-language:ZH-CN'>2</span><span
lang=EN-US style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;
mso-fareast-language:ZH-CN'><span style="mso-spacerun: yes"> </span>+ </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=EN-US style='font-family:宋体;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'><i>a</i></span><span lang=EN-US style='font-family:宋体;mso-ascii-font-family:
宋体;font-size:59%;position:relative;top:-.45em;mso-text-raise:30%;mso-fareast-language:
ZH-CN'><i>n</i></span><span lang=EN-US style='font-family:宋体;mso-ascii-font-family:
宋体;font-size:88%;mso-fareast-language:ZH-CN'><i>x</i></span><span lang=EN-US
style='font-family:宋体;mso-ascii-font-family:宋体;font-size:59%;position:relative;
top:-.45em;mso-text-raise:30%;mso-fareast-language:ZH-CN'><i>n</i></span><span
lang=EN-US style='font-family:宋体;mso-ascii-font-family:宋体;font-size:88%;
mso-fareast-language:ZH-CN'><i><span style="mso-spacerun: yes"> </span></i></span><span
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