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快速排序: D=Yr/qc?
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package org.rut.util.algorithm.support; bQPO'S4
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import org.rut.util.algorithm.SortUtil; 2^nws
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/** fKtlfQG
* @author treeroot <'BsQHI
* @since 2006-2-2 WGyPyG#Fl
* @version 1.0 vj]h[=:
*/ mHJGpJ=a-
public class QuickSort implements SortUtil.Sort{ ml!c0<
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/* (non-Javadoc) 'Z%1Ly^b
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $@L2zl1
*/ yL
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public void sort(int[] data) { NW*#./WdF8
quickSort(data,0,data.length-1); o`
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} /s+S\
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private void quickSort(int[] data,int i,int j){ _j*I\
int pivotIndex=(i+j)/2; ug;~dhe~
//swap C@<gCM j,"
SortUtil.swap(data,pivotIndex,j); >p" U|
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int k=partition(data,i-1,j,data[j]); nE2?3 S>
SortUtil.swap(data,k,j); <Of-,PcCV
if((k-i)>1) quickSort(data,i,k-1); rp2g./2
if((j-k)>1) quickSort(data,k+1,j); ! CJ*zZ*
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} H$pgzNL
/** EWv[Sp
* @param data 8U4In[4
* @param i 2iO{*cB
* @param j X\i;j!;d
* @return &] xtx>qg<
*/ VUz+_)
private int partition(int[] data, int l, int r,int pivot) { <aI}+
do{ wbh=v;
while(data[++l] while((r!=0)&&data[--r]>pivot); +Yc@<$4
SortUtil.swap(data,l,r); Dca,IaT'
} 6BM$u v4
while(l SortUtil.swap(data,l,r); _>?.MUPB
return l; D(&WEmm\B
} cRNVqMpg
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} UIht`[(z
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改进后的快速排序: )UVekkq>Q
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package org.rut.util.algorithm.support; [X8EfU}
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import org.rut.util.algorithm.SortUtil; sB^ejH
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/** BglbQ'6p
* @author treeroot f|)~_JH
* @since 2006-2-2 % I2JS
* @version 1.0 8s-X H
*/ OK47Q{.gh
public class ImprovedQuickSort implements SortUtil.Sort { P97i<pB Y_
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private static int MAX_STACK_SIZE=4096; `VDvxl@1
private static int THRESHOLD=10; K]|hkp&
/* (non-Javadoc) @e$EwCV,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ziM@@$.F
*/ Gm0}KU
public void sort(int[] data) { p1mAoVxR
int[] stack=new int[MAX_STACK_SIZE]; h|lH`m^
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int top=-1; ,Ik~E&Ku2'
int pivot; zG^$-L.n
int pivotIndex,l,r; iU3PlF[B/o
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stack[++top]=0; 6BEDk!
stack[++top]=data.length-1; HnsLYY\
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while(top>0){ $'<$:;4b3
int j=stack[top--]; R4$(NNC+/
int i=stack[top--]; M
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pivotIndex=(i+j)/2; "s(|pQh;
pivot=data[pivotIndex]; Ap |g[J
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SortUtil.swap(data,pivotIndex,j); 0I2?fz)
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//partition [
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l=i-1; IH5^M74b
r=j; A6
do{ ,\d03wha
while(data[++l] while((r!=0)&&(data[--r]>pivot)); &!HG.7AY
SortUtil.swap(data,l,r); jyidNPLm4
} r@wE?hK
while(l SortUtil.swap(data,l,r); Xr88I^F;
SortUtil.swap(data,l,j); HIfi18
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if((l-i)>THRESHOLD){ dP]Z:
stack[++top]=i; [ lK`~MlQ
stack[++top]=l-1; lE8_Q *ev
} 4\uq$.f-
if((j-l)>THRESHOLD){ E33x)CP
stack[++top]=l+1; T|
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stack[++top]=j; b!nA.`T
} [TxvZq*4
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} Z1;+a+S=z
//new InsertSort().sort(data); {>TAnb?n
insertSort(data); {Hvkn{{'
} !vHCftKel
/** =CCddLO
* @param data wOrj-Smx
*/ &lxMVynL
private void insertSort(int[] data) { ft iAty0n
int temp; ^1aY,6I:
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); gI@nE:(m
} 7ks!0``
} TY` R_
} GpR,n2
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} 2+R]q35-
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