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快速排序: t5WW3$Nf
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package org.rut.util.algorithm.support; qm=N@@R&
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import org.rut.util.algorithm.SortUtil; 1$ C\`
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/** ?T <2Cl'C
* @author treeroot u IGeSd5B
* @since 2006-2-2 dBMr%6tz
* @version 1.0 =6:>C9
*/ J PK(S~
public class QuickSort implements SortUtil.Sort{ N3g\X
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/* (non-Javadoc) K.K=\
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) uMe]].04
*/ i_6 Y6
public void sort(int[] data) { o&"nF+,
quickSort(data,0,data.length-1); aoVfvz2Y
} 1x~dsM;q
private void quickSort(int[] data,int i,int j){ a6i%7O m
int pivotIndex=(i+j)/2; z8\z`#g!
//swap '&hk?
SortUtil.swap(data,pivotIndex,j); 3=~0m
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int k=partition(data,i-1,j,data[j]); {:0TiOP5x
SortUtil.swap(data,k,j); &`IC3O5
if((k-i)>1) quickSort(data,i,k-1); YE5B^sQ1
if((j-k)>1) quickSort(data,k+1,j); qt!0#z8
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}
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/** Q9h;`G
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* @param data #?EmC]N7
* @param i 48Z0aA~+
* @param j CDU$Gi
* @return %qqX-SF0C
*/ .~t.B!rVSB
private int partition(int[] data, int l, int r,int pivot) { 2Ub!wee
do{ ,4tuWO)"
while(data[++l] while((r!=0)&&data[--r]>pivot); (Ld,<!eN0
SortUtil.swap(data,l,r); H!yqIh
} &@h(6
while(l SortUtil.swap(data,l,r); QlCs,bT
return l; VuWBWb?0Q
} R+y 9JE
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} <UC_QPA\
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改进后的快速排序: NP^j5|A*"
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package org.rut.util.algorithm.support; yz7X7mAo
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import org.rut.util.algorithm.SortUtil; +<o}@hefY2
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/** mxfmK +'_
* @author treeroot FLzC kzJ:6
* @since 2006-2-2 qPG>0
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* @version 1.0 kMP3PS
*/ Mo~zq.
public class ImprovedQuickSort implements SortUtil.Sort { -)LiL
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private static int MAX_STACK_SIZE=4096; nqMXE82
private static int THRESHOLD=10; qRnD{g|{1
/* (non-Javadoc) @nOj6b
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vlS+UFH0
*/ 3BzC'nplm
public void sort(int[] data) {
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int[] stack=new int[MAX_STACK_SIZE]; :[C"}mR1
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int top=-1; cA8A^Iv:0
int pivot; 6A23H7
int pivotIndex,l,r; C_ 4(-OWq
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stack[++top]=0; {\62c;.
stack[++top]=data.length-1; y1c2(K>tu
+l) [A{
while(top>0){ -b`O"Ck*
int j=stack[top--]; a*(,ydF|L
int i=stack[top--]; {|D7H=f
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pivotIndex=(i+j)/2; xg8$ <Ut
pivot=data[pivotIndex]; ZD;1{
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SortUtil.swap(data,pivotIndex,j); ?)V?6"fFP
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//partition /fDXO;tN
l=i-1; f~?4
r=j; !}pvrBS
do{ xh`4s
while(data[++l] while((r!=0)&&(data[--r]>pivot)); nc/F@HCB
SortUtil.swap(data,l,r); =jIP29+
} eOU v#F
while(l SortUtil.swap(data,l,r); ,?/AIL]_
SortUtil.swap(data,l,j); 6[~_;0
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if((l-i)>THRESHOLD){ *mtS\J
stack[++top]=i; eRm 9LOp
stack[++top]=l-1; ]r.95|V*
} wMvAm%}+
if((j-l)>THRESHOLD){ #)b0&wyW6i
stack[++top]=l+1; Pof]9qE-y
stack[++top]=j; :-)H
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} T7qE
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} G A+#'R
//new InsertSort().sort(data); 8RaRXnJ
insertSort(data); LzGSN
} T6M=BkcP
/** 9L7jYy=A#
* @param data l:- <CbG
*/ ~;/}D0k$x
private void insertSort(int[] data) { .hVB)@/
int temp; "l[ c/q[
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); +b_o2''
} 4RyQ^vL
} ,LftQ1*;
}
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} o/4U`U)Q0v
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