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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#FF0000">Procedure (k,s) <i><font size="3" color="#CC0099"> (</font></i></font><i><font face="Arial, Helvetica, sans-serif" size="3" color="#CC0099">类似快速分类)</font></i><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">
<font color="#0033CC">1. </font> if |s|=1
<font color="#0033CC">2.</font> then return S
else
<font color="#0033CC">3.</font> begin
<font color="#0033CC">4. </font> 随机地从S选出一个元素a;
<font color="#0033CC">5. </font> 设S1，S2，S3分别为>，=，< a的序列
<font color="#0033CC">6. </font> if |S1|≥k
then return SELECT(k, S1 )
else
<font color="#0033CC">7. </font> if |S1|+|S2|≥k
then return(a)
<font color="#0033CC">8. </font> else
<font color="#0033CC">9.</font> return SELECT(k-|S1|-|S2|, S3 )
end
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