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快速排序: 5C`Vno~v
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package org.rut.util.algorithm.support; QrmGrRH
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import org.rut.util.algorithm.SortUtil; :k.>H.8+~
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/** U/U_q-z]
* @author treeroot olo9YrHn
* @since 2006-2-2 /8_x]Es/
* @version 1.0 A;C4>U Y
*/ O[1Q#
public class QuickSort implements SortUtil.Sort{ ,82?kky
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/* (non-Javadoc) i0x[w>\-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) UeBSt.
*/ :WH0=Bieh
public void sort(int[] data) { w{;bvq%lY
quickSort(data,0,data.length-1); fH,h\0
} !h1|B7N
private void quickSort(int[] data,int i,int j){ =hh,yi
int pivotIndex=(i+j)/2; @&G
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//swap q,Nqv[va
SortUtil.swap(data,pivotIndex,j); GZ:1bV37%
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int k=partition(data,i-1,j,data[j]); wjID*s[
SortUtil.swap(data,k,j); 9WoTo ,q
if((k-i)>1) quickSort(data,i,k-1); J{uqbrJICr
if((j-k)>1) quickSort(data,k+1,j); fEK%)Z:0
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} v%c--cO(S4
/** :Z;kMrU
* @param data "NSY=)fV
* @param i 0R+<^6^l)
* @param j I%{D5.du
* @return =snJ+yn!
*/ bb/A}<
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private int partition(int[] data, int l, int r,int pivot) {
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do{ G\f:H%[5[
while(data[++l] while((r!=0)&&data[--r]>pivot); 'OYnLz`"6
SortUtil.swap(data,l,r); , YE+k`:
} G8W^XD
while(l SortUtil.swap(data,l,r); :Ot5W
return l; a!x?Apww
} :,^x?'HK
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} ?y* yl
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改进后的快速排序: Y#-pK)EeU
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package org.rut.util.algorithm.support; .a]av
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import org.rut.util.algorithm.SortUtil; $kQQdF
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/** l=&Va+K
* @author treeroot 1NlpOVq:)
* @since 2006-2-2 a,*|*Cv
* @version 1.0 3 _DJ
*/ y=y#*yn &
public class ImprovedQuickSort implements SortUtil.Sort { 'khhn6itA
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private static int MAX_STACK_SIZE=4096; 5m6I:s`pK
private static int THRESHOLD=10; s)~H_,
/* (non-Javadoc) /$ueLa
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6k\8ulHw
*/ 7LW%:0
public void sort(int[] data) { \9.@Tg8`
int[] stack=new int[MAX_STACK_SIZE]; v.H@Ey2
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int top=-1; "g;}B"rG
int pivot; K&vqk/JW1
int pivotIndex,l,r; 0_map z
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stack[++top]=0; G?yG|5.pU
stack[++top]=data.length-1; 1FEY&rpR
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while(top>0){ ->YF</I
int j=stack[top--]; a: OuDjFp
int i=stack[top--]; h IUO=f
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pivotIndex=(i+j)/2; K06&.>v_
pivot=data[pivotIndex]; PHn3f;I
o{
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SortUtil.swap(data,pivotIndex,j); KA0_uty/T
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//partition _"";SqVB
l=i-1; M$GZK'%
r=j; Jp`qE
do{ ulnlRx
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ji|tc9#6
SortUtil.swap(data,l,r); v4x1=E
} yB^_dE
while(l SortUtil.swap(data,l,r); RV+0C&0ff
SortUtil.swap(data,l,j); `zRm
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if((l-i)>THRESHOLD){ 6m{1im=
stack[++top]=i; _NJq%-,'
stack[++top]=l-1; .
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} !"x&tF
if((j-l)>THRESHOLD){ 7j L.\O
stack[++top]=l+1; IOOAaa @(
stack[++top]=j; A 4|a{\|$
} ghqq%g
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} K F`@o@,
//new InsertSort().sort(data); zz+[]G+"2m
insertSort(data); )y}W=Q>T
} 4~/3MG
/** o]*#|4-
* @param data 09u@-
*/ )[hQK_e]
private void insertSort(int[] data) { .q7o7J%
int temp; ;7Y4v`m
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); )o8]MWT\;
} pO_L,~<
} ({AqL#x`u
} J'>i3eLq
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} n~NOqvT <
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