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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#FF0000">例1.1 </font><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"> 求一个集合中的最大元素和最小元素。
<font color="#FF0000"> Procedure maxmin(s);</font>
<font color="#0033CC">1. </font> <i><font size="3" color="#CC0099"> if </font></i> |s|=2
<font color="#0033CC">2. </font> <i><font size="3" color="#CC0099"> then </font></i><font size="3" color="#CC0099"><i> begin </i></font> 设|s|={c,d};
<font color="#0033CC">3. </font> (a,b)←(MAX（c,d),MIN(c,d)).
<i><font size="3" color="#CC0099"> end</font></i>
<i><font size="3" color="#CC0099"> else begin</font></i>
<font color="#0033CC">4. </font> 把S分成二个子集S1，S2，各存一半元素；
<font color="#0033CC">5. </font> (maxl, minl) ← maxmin(S1 );
<font color="#0033CC">6. </font> (max2, min2) ← maxmin(S2 );
<font color="#0033CC">7. </font> （a,b）← (MAX(max1,max2), MIN(min1,min2))
<i><font size="3" color="#CC0099"> end</font></i>
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