ds5.3.2.htm

这是清华大学所用的数据结构的电子版教材

<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp; 
if(pa-&gt;col&lt;pb-&gt;col&amp;&amp;pa-&gt;col!=0 ) /*<font FACE="??ì?,SimSun" LANG="ZH-CN">第三种情况</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp; 
{qa=pa;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp; 
pa=pa-&gt;right;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp; 
}</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp; 
else</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp; 
if(pa-&gt;col&gt;pb-&gt;col||pa-&gt;col==0 ) /*<font FACE="??ì?,SimSun" LANG="ZH-CN">第四种情况</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp; 
{p=malloc(sizeof(MNode));</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
p-&gt;row=pb-&gt;row; p-&gt;col=pb-&gt;col; p-&gt;v=pb-&gt;v;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><b><font size="5" color="#FFFFFF">&nbsp;&nbsp;&nbsp; 
p-&gt;right=pa;qa-&gt;right=p;/</font><font color="#FFFFFF" size="4">* <font FACE="??ì?,SimSun" LANG="ZH-CN">新结点插入</font>*pa<font FACE="??ì?,SimSun" LANG="ZH-CN">的前面</font>*/</font></b></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><b><font size="5" color="#FFFFFF">&nbsp;&nbsp;&nbsp; 
pa=p;</font><font color="#FFFFFF" size="4">/*<font FACE="??ì?,SimSun" LANG="ZH-CN">新结点还要插到列链表的合适位置，先找位置，再插入</font>*/</font></b></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
q=Find_JH(Ha,p-&gt;col); /*<font FACE="??ì?,SimSun" LANG="ZH-CN">从列链表的头结点找起</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
while(q-&gt;down-&gt;row!=0 &amp;&amp; q-&gt;down-&gt;row&lt;p-&gt;row)</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
q=q-&gt;down;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
p-&gt;down=q-&gt;down; /*<font FACE="??ì?,SimSun" LANG="ZH-CN">插在</font>*q<font FACE="??ì?,SimSun" LANG="ZH-CN">的后面</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
q-&gt;down=p;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
pb=pb-&gt;right;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
} /* if */</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp; 
else /*<font FACE="??ì?,SimSun" LANG="ZH-CN">第一、二种情况</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp; 
{x= pa-&gt;v_next.v+ pb-&gt;v_next.v;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
if (x==0) /*<font FACE="??ì?,SimSun" LANG="ZH-CN">第二种情况</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
{qa-&gt;right=pa-&gt;right; ./*<font FACE="??ì?,SimSun" LANG="ZH-CN">从行链中删除</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
/*<font FACE="??ì?,SimSun" LANG="ZH-CN">还要从列链中删除，找</font>*pa<font FACE="??ì?,SimSun" LANG="ZH-CN">的列前驱结点</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
q=Find_JH(Ha,pa-&gt;col);/*<font FACE="??ì?,SimSun" LANG="ZH-CN">从列链表的头结点找起</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
while ( q-&gt;down-&gt;row &lt; pa-&gt;row )</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
q=q-&gt;down;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
q-&gt;down=pa-&gt;down;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
free (pa);</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
pa=qa;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
} /*if (x==0)*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
else /*<font FACE="??ì?,SimSun" LANG="ZH-CN">第一种情况</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
{pa-&gt;v_next.v=x;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
qa=pa;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp;&nbsp; 
}</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
pa=pa-&gt;right;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp;&nbsp; 
pb=pb-&gt;right;</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;&nbsp; 
}</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp; 
} /*while*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp; 
ca=ca-&gt;v_next.next; /*ca<font FACE="??ì?,SimSun" LANG="ZH-CN">指向</font>A<font FACE="??ì?,SimSun" LANG="ZH-CN">中下一行的表头结点</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp; 
cb=cb-&gt;v_next.next; /*cb<font FACE="??ì?,SimSun" LANG="ZH-CN">指向</font>B<font FACE="??ì?,SimSun" LANG="ZH-CN">中下一行的表头结点</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>&nbsp;} 
while (ca-&gt;row==0) /*<font FACE="??ì?,SimSun" LANG="ZH-CN">当还有未处理完的行则继续</font>*/</b></font></p>
<p ALIGN="justify" style="margin-top: 0; margin-bottom: 0"><font size="5" color="#FFFFFF"><b>return 
Ha;</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"><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">算法</font>5.5 
<font FACE="??ì?,SimSun" LANG="ZH-CN">十字链表表示的稀疏矩阵相加</font></b></font></p>
<p ALIGN="JUSTIFY"><font size="3">&nbsp; </font><font size="5" color="#FFFFFF"><b><font FACE="??ì?,SimSun" LANG="ZH-CN">为了保持算法的层次，在上面的算法，用到了一个函数</font>findjH<font FACE="??ì?,SimSun" LANG="ZH-CN">。函数</font>Mlink 
Find_JH(MLink H, int j)<font FACE="??ì?,SimSun" LANG="ZH-CN">的功能是：返回十字链表</font> 
H <font FACE="??ì?,SimSun" LANG="ZH-CN">中第</font>j<font FACE="??ì?,SimSun" LANG="ZH-CN">列链表的头结点指针。</font></b></font></p>
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<p ALIGN="JUSTIFY">　</p>
</font>
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