📄 ds9.4.2.htm
字号:
"Times New Roman"">～</span><span lang="EN-US">9</span><span style="font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">，所以</span><span lang="EN-US">r=10</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">。</span></font></b></p>
<p class="MsoNormal"><b><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman""><font size="5" color="#FFFF00">【例</font></span><font size="5" color="#FFFF00"><span lang="EN-US">9.9</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">】</span></font><font color="#FFFFFF" size="5"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">若关键码是仅由英文字母组成的字符串，不考虑大小写，则每位上可能有</span><span lang="EN-US">26</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">种不同的字母，所以</span><span lang="EN-US">r=26</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">。</span></font></b></p>
<p class="MsoNormal"><font color="#FFFFFF" size="5"><b><span style="mso-spacerun: yes" lang="EN-US">
</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">数字分析法根据</span><span lang="EN-US">r</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">种不同的符号，在各位上的分布情况，选取某几位，组合成哈希地址。所选的位应是各种符号在该位上出现的频率大致相同。</span></b></font></p>
<p class="MsoNormal"><font color="#FFFFFF" size="5"><b><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">【例</span><span lang="EN-US">9.10</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">】有一组关键码如下：</span></b></font></p>
<p class="MsoNormal"><b><font color="#FFFFFF" size="5"><span lang="EN-US"><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span>7<span style="mso-spacerun: yes"> </span>0<span style="mso-spacerun: yes">
</span>5<span style="mso-spacerun: yes"> </span>2<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""></span></font><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="5">
</font><font color="#FFFFFF" size="4">第</font></span><font color="#FFFFFF" size="4"><span lang="EN-US">1</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">、</span><span lang="EN-US">2</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">位均是“</span><span lang="EN-US">3</span><span style="font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">和</span><span lang="EN-US">4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">”，</span></font><font color="#FFFFFF" size="5"><span style="mso-spacerun:
yes" lang="EN-US"></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""></span></font><font color="#FFFFFF" size="4"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">第</span><span lang="EN-US">3</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">位也只有</span></font><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="4"></font></span></b></p>
<p class="MsoNormal"><b><font color="#FFFFFF" size="5"><span lang="EN-US"><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span>9<span style="mso-spacerun: yes"> </span>1<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun: yes"> </span>8<span style="mso-spacerun: yes">
</span>7<span style="mso-spacerun:
yes"> </span></span></font><span style="mso-spacerun: yes" lang="EN-US"><font color="#FFFFFF" size="5">
</font></span><font color="#FFFFFF" size="4"><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"">“</span></font><font color="#FFFFFF" size="4"><span lang="EN-US">
7</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">、</span><span lang="EN-US">8</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">、</span><span lang="EN-US">9</span><span style="font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">”，因此，这几位不能用，</span></font></b></p>
<p class="MsoNormal"><b><font color="#FFFFFF" size="5"><span lang="EN-US"><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span>8<span style="mso-spacerun: yes"> </span>2 <span style="mso-spacerun: yes"> </span>6<span style="mso-spacerun: yes">
</span>9<span style="mso-spacerun: yes"> </span>6<span style="mso-spacerun:
yes"> </span></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""></span></font><span style="font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="5">
</font><font color="#FFFFFF" size="4">余</font></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="4">下四位分布较均匀，可作为哈希地</font></span></b></p>
<p class="MsoNormal"><b><font color="#FFFFFF" size="5"><span lang="EN-US"><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span>8<span style="mso-spacerun: yes"> </span>5<span style="mso-spacerun: yes">
</span>2<span style="mso-spacerun: yes"> </span>7<span style="mso-spacerun: yes">
</span>0<span style="mso-spacerun:
yes"> </span></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""></span></font><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="5">
</font><font color="#FFFFFF" size="4">址选用。若哈希地址是两位，则可取这</font></span></b></p>
<p class="MsoNormal"><b><font color="#FFFFFF" size="5"><span lang="EN-US"><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span>8<span style="mso-spacerun: yes"> </span>6<span style="mso-spacerun: yes">
</span>3<span style="mso-spacerun: yes"> </span>0<span style="mso-spacerun: yes">
</span>5<span style="mso-spacerun:
yes"> </span></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""></span></font><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="5">
</font><font color="#FFFFFF" size="4">四位中的任意两位组合成哈希地址，也</font></span></b></p>
<p class="MsoNormal"><b><font color="#FFFFFF" size="5"><span lang="EN-US"><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span>9<span style="mso-spacerun: yes"> </span>8<span style="mso-spacerun: yes">
</span>0<span style="mso-spacerun: yes"> </span>5<span style="mso-spacerun: yes">
</span>8<span style="mso-spacerun:
yes"> </span></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""></span></font><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="5">
</font><font color="#FFFFFF" size="4">可以取其中两位与其它两位叠加求和</font></span></b></p>
<p class="MsoNormal"><b><font color="#FFFFFF" size="5"><span lang="EN-US"><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4<span style="mso-spacerun:
yes"> </span>7<span style="mso-spacerun: yes"> </span>9<span style="mso-spacerun: yes">
</span>6<span style="mso-spacerun: yes"> </span>7<span style="mso-spacerun: yes">
</span>1<span style="mso-spacerun:
yes"> </span></span></font><span style="mso-spacerun: yes" lang="EN-US"><font color="#FFFFFF" size="5">
</font></span><font color="#FFFFFF" size="4"><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"">后，取低两位作哈</span></font><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""></span><span style="font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman""><font color="#FFFFFF" size="4">希地址。</font></span></b></p>
<p class="MsoNormal" style="line-height:10.0pt;mso-line-height-rule:exactly"><span lang="EN-US"><font color="#FFFFFF" size="5"><b><span style="mso-spacerun: yes"> </span>3<span style="mso-spacerun: yes">
</span>4 <span style="mso-spacerun:
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