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快速排序: M'kVL0p?vN
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package org.rut.util.algorithm.support; Mr-DGLJ
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import org.rut.util.algorithm.SortUtil; (=1)y'.
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/** X*i/A<Y`=
* @author treeroot [`d$X^<y;
* @since 2006-2-2 p8Iw!HE
* @version 1.0 7_-w_"X
*/ 0axxQ!Ivx
public class QuickSort implements SortUtil.Sort{ ~
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/* (non-Javadoc) (ab{F5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !BDUv(
*/ 7KU~(?|:h
public void sort(int[] data) { 7c-Gm R2
quickSort(data,0,data.length-1); iZaeoy
} "NDxgJ%J35
private void quickSort(int[] data,int i,int j){ blGf!4H
int pivotIndex=(i+j)/2; *I0Tbc
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//swap J1bA2+5.*e
SortUtil.swap(data,pivotIndex,j); %?bcT[|3
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int k=partition(data,i-1,j,data[j]); 0n.S,3|
SortUtil.swap(data,k,j); f|U0s
if((k-i)>1) quickSort(data,i,k-1); baee?6
if((j-k)>1) quickSort(data,k+1,j); +iy7e6P
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} $$hv`HE^l
/** Ur^j$B}
* @param data hrbo:8SL
* @param i Ow3P-UzU3
* @param j p,F^0OU2}:
* @return <\" .L
*/ (zG.aaz*C
private int partition(int[] data, int l, int r,int pivot) { .-0%6]
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do{ H6gU?9%
while(data[++l] while((r!=0)&&data[--r]>pivot); '_dzcN,z
SortUtil.swap(data,l,r); K$H
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} piOXo=9H.
while(l SortUtil.swap(data,l,r); ,w{m3;]_%
return l; UNDi_6Dy
} XF}rd.K:
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} $+cAg>
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改进后的快速排序: YD\]{,F|
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package org.rut.util.algorithm.support; Q/ZkW
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import org.rut.util.algorithm.SortUtil; jij<yM8$g
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/** |9Yi7.
* @author treeroot `Gd$:qV
* @since 2006-2-2 n,j$D62[
* @version 1.0 [iS,#w`
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*/ e'2Y1h
public class ImprovedQuickSort implements SortUtil.Sort { Sw8kIC
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private static int MAX_STACK_SIZE=4096; ^N{ltgQY
private static int THRESHOLD=10; u=r`t(Z1H
/* (non-Javadoc) N8v'70
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -kp swP
*/ ""{|3XJe
public void sort(int[] data) { )zq.4
int[] stack=new int[MAX_STACK_SIZE]; y{d^?(-
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int top=-1; <YFY{VC(
int pivot; ]3B %8
int pivotIndex,l,r; <?h%k"5
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stack[++top]=0; ~ttY(wCV
stack[++top]=data.length-1; |E@djosyC
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while(top>0){ rR,2UZR
int j=stack[top--]; FJNF%a)x2I
int i=stack[top--]; ?":'O#E
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pivotIndex=(i+j)/2; C`V)VJM
pivot=data[pivotIndex]; T*~H m
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SortUtil.swap(data,pivotIndex,j); }LP!)|E
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//partition &v!WVa?
l=i-1; pV(lhDNoQ
r=j; wGsRS[
do{ B*1W`f
while(data[++l] while((r!=0)&&(data[--r]>pivot)); nkDy!"K
SortUtil.swap(data,l,r); |3hY6aty
} {g6Qv-
while(l SortUtil.swap(data,l,r); ;AJTytE>%
SortUtil.swap(data,l,j); 2;`=P5V
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if((l-i)>THRESHOLD){ }_
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stack[++top]=i; 4~z?"
stack[++top]=l-1; Bi3+)k>u7
} Pw0Ci
if((j-l)>THRESHOLD){ ?=;qK{)37
stack[++top]=l+1; aqU'
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stack[++top]=j; i/So6jW
} &o3K%M;C?
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} lb*8G
//new InsertSort().sort(data); ww k
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insertSort(data); _-~`03 `!
} Zm
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/** BV`- =wRC
* @param data wJ<Oo@snm
*/ h*B|fy4K9U
private void insertSort(int[] data) { !ZRs;UZ>o
int temp; o>/O++7R a
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); CjIu[S1%
} ]rN5Ao}2
} .lgPFr6X
} *Vw\'%p*
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} 6
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