ds4.1.htm

这是清华大学所用的数据结构的电子版教材

<span lang="EN-US">StrCmp(s1,s2)</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s1,s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：若</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s1==s2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">，操作返回值为</span><span lang="EN-US">0</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">；若</span><span lang="EN-US">s1&lt;s2, 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">返回值</span><span lang="EN-US">&lt;0</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">；若</span><span lang="EN-US">s1&gt;s2, 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">返回值</span><span lang="EN-US">&gt;0</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">。</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">6、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">子串定位</span></font><span lang="EN-US"><font face="宋体" color="#FFFFFF" size="4">StrIndex(s,t)</font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">:找子串</span><span lang="EN-US">t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">在主串</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">中首次出现的位置</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s,t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：若</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">∈</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">，则操作返回</span><span lang="EN-US">t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">在</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">中首次出现的位置，否则返回值为</span><span lang="EN-US">-1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">如：</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">StrIndex(</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">abcdebda</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">,</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">bc</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">)=2</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><span lang="EN-US"><span style="mso-spacerun: yes"><font color="#FFFFFF"><b><font size="5" face="宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</font></b></font></span><font size="5" face="宋体" color="#FFFFFF"><b>StrIndex(</b></font></span><font color="#FFFFFF"><b><font size="5" face="宋体"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">abcdebda</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">,</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">ba</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">＂</span><span lang="EN-US">)=-1</span></font></b></font></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><span lang="EN-US">7、</span>串插入</span> 
<span lang="EN-US">StrInsert(s,i,t)</span></font></b></p>
<p class="MsoNormal" align="left" style="margin-left:21.0pt;text-align:left"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s,t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在，</span><span lang="EN-US">1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">i</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">StrLength(s)+1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：将串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">插入到串</span><span lang="EN-US">s 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的第</span><span lang="EN-US">i</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">个字符位置上，</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的串值发生改变。</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">8、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">串删除</span> 
<span lang="EN-US">StrDelete(s,i,len)</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在，</span><span lang="EN-US">1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">i</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">StrLength(s)</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">，</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt"><b><font size="5" face="宋体" color="#FFFFFF">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<span lang="EN-US">0</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">len</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">≤</span><span lang="EN-US">StrLength(s)-i+1</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：删除串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">中从第</span><span lang="EN-US">i</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">个字符开始的长度为</span><span lang="EN-US">len</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的子串，</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的串值改变。</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt;text-indent:-21.0pt;mso-list:l31 level1 lfo17;
tab-stops:list 21.0pt"><b><span lang="EN-US"><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">9、</span></font></span><font size="5" face="宋体" color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">串替换　</span><span lang="EN-US">StrRep(s,t,r)</span></font></b></p>
<p class="MsoNormal" style="margin-left:21.0pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作条件：串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">s,t,r</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">存在，</span><span lang="EN-US">t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">不为空。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">操作结果：用串</font></span><font size="5" face="宋体" color="#FFFFFF"><span lang="EN-US">r 
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">替换串</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">中出现的所有与串</span><span lang="EN-US">t</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">相等的不重叠的子串，</span><span lang="EN-US">s</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的串值改变。</span></font></b></p>
<p class="MsoNormal" style="text-indent:20.65pt"><b><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font size="5" face="宋体" color="#FFFFFF">以上是串的几个基本操作。其中前５个操作是最为基本的，它们不能用其他的操作来合成，因此通常将这５个基本操作称为最小操作集。</font></span></b></p>
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