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快速排序: asbFNJG{
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package org.rut.util.algorithm.support; M7(]NQ\TQ
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import org.rut.util.algorithm.SortUtil; cvV8;
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/** m khp@^5
* @author treeroot ,u.A[{@py
* @since 2006-2-2 !\q'{x5C
* @version 1.0 Acb %)Y
*/ QEY#U|
public class QuickSort implements SortUtil.Sort{ In}~bNv?
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/* (non-Javadoc) ,k,+UisG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ESkhCDU
*/ "u"?~
public void sort(int[] data) { ^O3p:X4u
quickSort(data,0,data.length-1); +?0r%R%\
} :2;c@ uj
private void quickSort(int[] data,int i,int j){ 5>h#
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int pivotIndex=(i+j)/2; I -V=Z:
//swap 3MHByT%
SortUtil.swap(data,pivotIndex,j); %){) /~e&
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int k=partition(data,i-1,j,data[j]); Z7dV y8J
SortUtil.swap(data,k,j); K`kWfPwp
if((k-i)>1) quickSort(data,i,k-1); D(Q=EdlO
if((j-k)>1) quickSort(data,k+1,j); (w/lZt
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} v
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/** xx[l#+:c
* @param data Kd3EZo.
* @param i C*Dco{
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* @param j W%K=N-kE_
* @return PkDh[i9Z|
*/ m2to94yh
private int partition(int[] data, int l, int r,int pivot) { *6]_ 6xO
do{ Yr 1k\q
while(data[++l] while((r!=0)&&data[--r]>pivot); -W)8Z.
SortUtil.swap(data,l,r); 7iH%1f
} X%Ta?(9|.^
while(l SortUtil.swap(data,l,r); !F#^Peb
return l; eu?DSad
} o1rH@ D6/-
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} jxDA+7
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改进后的快速排序: e&F=w`F\
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package org.rut.util.algorithm.support; Zs}EGC~&
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import org.rut.util.algorithm.SortUtil; ]0myoWpi3
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/** OG2&=~hOz-
* @author treeroot *&rV}vVP^
* @since 2006-2-2 3b1%^@,ACy
* @version 1.0 9I*`~il>{
*/ C 4hvk'=
public class ImprovedQuickSort implements SortUtil.Sort { lxOUV? m^N
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private static int MAX_STACK_SIZE=4096; ,M$J
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private static int THRESHOLD=10; <~35tOpv
/* (non-Javadoc) ,:?=j80m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /7yd&6`I
*/ M0"}>`1lJ
public void sort(int[] data) { \$D41_Wt|
int[] stack=new int[MAX_STACK_SIZE]; {A8w~3F
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int top=-1; F=~LVaF/_
int pivot; 6B`,^8Lp
int pivotIndex,l,r; bDM;7fFp$
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stack[++top]=0; @!2vS@f
stack[++top]=data.length-1; yo"!C?82=
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while(top>0){ mA0|W#NB
int j=stack[top--]; -3&mgd
int i=stack[top--]; +{"w5o<CO
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pivotIndex=(i+j)/2; I"r[4>>B>0
pivot=data[pivotIndex]; *aS[^iX?s
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SortUtil.swap(data,pivotIndex,j); CGJ>j}C
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//partition r>x>aJ
l=i-1; be:=-B7!
r=j; nSeb?|$D 6
do{
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); }} wZ
SortUtil.swap(data,l,r); .+dego:
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while(l SortUtil.swap(data,l,r); Q@? {|7:
SortUtil.swap(data,l,j); gWHjI3;
{
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if((l-i)>THRESHOLD){ ^F`\B'8MF
stack[++top]=i; lxXIu8
stack[++top]=l-1; @[w.!GW%
} R)BH:wg"
if((j-l)>THRESHOLD){ -{s9PZ3~_
stack[++top]=l+1; XT~]pOE;D
stack[++top]=j; ~mYCXf oc{
} +]jJ: V
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} uE:`Fo=y
//new InsertSort().sort(data); @8'LI8 \/
insertSort(data); ;0]s:0WD0P
} I vD M2q8f
/** ]ppws3*Pa
* @param data ()%;s2>F
*/ &(,-:"{pNR
private void insertSort(int[] data) { *4RL
int temp; Xrd-/('2
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); T96M=?wh!
} P'D'+qS
} %~^:[@xa*
} 'w~e>$WI
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} XZ[3v9?&n
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