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<p align="center"><font color="#FFFF00" size="6"><b><font lang="ZH-CN" face="oúì?,SimHei">5.4.2
</font><font FACE="oúì?,SimHei" LANG="ZH-CN">广义表基本操作的实现</font></b></font><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">
</font></b></font></p>
<p ALIGN="JUSTIFY"><font FACE="??ì?,SimSun" LANG="ZH-CN" size="5" color="#FFFFFF"><b>
我们以头尾表示法存储广义表，讨论广义表的有关操作的实现。由于广义表的定义是递归的，因此相应的算法一般也都是递归的。</b></font></p>
<font FACE="oúì?,SimHei" LANG="ZH-CN">
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>⒈广义表的取头、取尾</b></font></p>
</font>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>GList
Head(GList ls)</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> if
(ls->tag = = 1) p = ls->hp;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> return
p;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<font SIZE="1">
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"></font><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>
5.6</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>GList
Tail(GList ls)</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b> if
(ls->tag = = 1) p = ls->tp;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>return
p;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<font SIZE="1">
<p ALIGN="JUSTIFY"></font><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>
5.7</b></font></p>
<font FACE="oúì?,SimHei" LANG="ZH-CN">
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>⒉建立广义表的存储结构</b></font></p>
</font>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>int Create(GList *ls, char
* S)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>{ Glist p; char *sub;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if StrEmpty(S) *ls = NULL;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>else {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (!(*ls = (GList)malloc(sizeof(GLNode))))
return 0;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (StrLength(S) = = 1) {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>(*ls)->tag = 0;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>(*ls)->data = S;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>else {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>(*ls)->tag = 1;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>p = *ls;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>hsub
=SubStr(S,2,StrLength(S)-2);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>do {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>sever(sub,hsub);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>Create(&(p->ptr.hp),
sub);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>q = p;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (!StrEmpty(sub)){</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (!(p = (GList)malloc(sizeof(GLNode))))
return 0;;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>p->tag = 1;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>q->ptr.tp = p;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}while (!StrEmpty(sub));</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>q->ptr.tp = NULL;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>return 1;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="CENTER"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>
5.8</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>int sever(char *str, char *hstr)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>int n = StrLength(str);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>i= 1; k = 0;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>for (i = 1, k = 0; i <=
n || k != 0; ++i)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>ch=SubStr(str,i,1);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (ch = = '(') ++k;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>else if (ch = = ')') --k;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (i <= n)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>hstr =SubStr(str,1,i-2);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>str= SubStr(str,i,n-i+1);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>else {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>StrCopy(hstr,str);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>ClearStr(str);</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<font SIZE="1">
<p ALIGN="JUSTIFY"></font><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>5.9</b></font></p>
<font FACE="oúì?,SimHei" LANG="ZH-CN">
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>⒊以表头、表尾建立广义表</b></font></p>
</font>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>int Merge(GList ls1,GList
ls2, Glist *ls)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (!(*ls = (GList)malloc(sizeof(GLNode))))
return 0;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>*ls->tag = 1;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>*ls->hp = ls1;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>*ls->tp = ls2;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>return 1;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<font SIZE="1">
<p ALIGN="JUSTIFY"></font><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>
5.10</b></font></p>
<font FACE="oúì?,SimHei" LANG="ZH-CN">
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>⒋求广义表的深度</b></font></p>
</font>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>int Depth(GList ls)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (!ls)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>return 1; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">空表深度为</font>1*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (ls->tag = = 0)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>return 0; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">单元素深度为</font>0*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>for (max = 0,p = ls; p; p =
p->ptr.tp) {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>dep = Depth(p->ptr.hp);
/*<font FACE="??ì?,SimSun" LANG="ZH-CN">求以</font>p->ptr.hp<font FACE="??ì?,SimSun" LANG="ZH-CN">尾头指针的子表深度</font>*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (dep > max) max = dep;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>return max+1; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">非空表的深度是各元素的深度的最大值加</font>1*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="CENTER"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>5.11</b></font></p>
<font FACE="oúì?,SimHei" LANG="ZH-CN">
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>⒌复制广义表</b></font></p>
</font>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>int CopyGList(GList ls1,
GList *ls2)</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>{</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (!ls1) *ls2 = NULL; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">复制空表</font>*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>else {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (!(*ls2 = (Glist)malloc(sizeof(Glnode))))
return 0; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">建表结点</font>*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>(*ls2)->tag =
ls1->tag;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>if (ls1->tag = = 0)
(*ls2)->data = ls1->data; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">复制单元素</font>*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>else {</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>CopyGList(&((*ls2)->ptr.hp),
ls1->ptr.hp); /*<font FACE="??ì?,SimSun" LANG="ZH-CN">复制广义表</font>ls1->ptr.hp<font FACE="??ì?,SimSun" LANG="ZH-CN">的一个副本</font>*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>CopyGList(&((*ls2)->ptr.tp)
, ls1->ptr.tp); /*<font FACE="??ì?,SimSun" LANG="ZH-CN">复制广义表</font>ls1->ptr.tp<font FACE="??ì?,SimSun" LANG="ZH-CN">的一个副本</font>*/</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>return 1;</b></font></p>
<p ALIGN="JUSTIFY"><font size="5" color="#FFFFFF"><b>}</b></font></p>
<p ALIGN="CENTER"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>
5.12</b></font></p>
<p ALIGN="center"> </p>
<p ALIGN="center"><b><a href="ds5.HTM"><font face="??ì?,SimSun" lang="ZH-CN" size="5" color="#FFFF00">返回</font></a></b></p>
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