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快速排序: "(YfvO+
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package org.rut.util.algorithm.support; tuslkOE#
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import org.rut.util.algorithm.SortUtil; d6XdN
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/** 0B]c`$"aD
* @author treeroot ]p@q.P
* @since 2006-2-2 9 >"}||))
* @version 1.0 ~='}(Fg:
*/ XE$;Z'Qhjm
public class QuickSort implements SortUtil.Sort{ GD1L6kVd1
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/* (non-Javadoc) Od+nBJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n+1`y8dy
*/ @;X#/dZe
public void sort(int[] data) { "9#hk3*GqX
quickSort(data,0,data.length-1); HBm(l@#.
} { ^Rr:+
private void quickSort(int[] data,int i,int j){ |,T"_R_K
int pivotIndex=(i+j)/2; TPA*z9n+B
//swap f{-,"6Y1
SortUtil.swap(data,pivotIndex,j); #G\Ae:O
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int k=partition(data,i-1,j,data[j]); lXRB"z
SortUtil.swap(data,k,j); eB9F35[
if((k-i)>1) quickSort(data,i,k-1); cv_t2m
if((j-k)>1) quickSort(data,k+1,j); H<"EE15
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} EX@Cf!GjN
/** P6)d#M
* @param data t!59upbN}3
* @param i ~i0>[S3'
* @param j gZ
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* @return ]/|DCxQ
*/ 0x#
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private int partition(int[] data, int l, int r,int pivot) { BkB9u&s^
do{ | Pqs)Mb]
while(data[++l] while((r!=0)&&data[--r]>pivot); ; hU9_e
SortUtil.swap(data,l,r); 93/`e}P"o
} 0R;`)V\^
while(l SortUtil.swap(data,l,r); Hp@cBj_@P2
return l; [6?x 6_M
} P0rdGf 5T
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} #fFD|q
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改进后的快速排序: W+.?J
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package org.rut.util.algorithm.support; {"0n^!
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import org.rut.util.algorithm.SortUtil; v%QCp
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/** lEpPi@2PK
* @author treeroot 0.#%KfQ
* @since 2006-2-2 4-\4G"4
* @version 1.0 we?t/YB=
*/ th=45y"C
public class ImprovedQuickSort implements SortUtil.Sort { G+iJS!=
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private static int MAX_STACK_SIZE=4096; ~'):1}KN]
private static int THRESHOLD=10; P2)g%$ME
/* (non-Javadoc) T{T> S%17~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) XB%`5wwd
*/ ezd@>(hJ
public void sort(int[] data) { u[!Ex=9W
int[] stack=new int[MAX_STACK_SIZE]; =PoPp
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int top=-1; uMBb=
int pivot; @T-}\AU
int pivotIndex,l,r; _"'-fl98*
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stack[++top]=0; cH7D@p}
stack[++top]=data.length-1; S*rc XG6Q^
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while(top>0){ qj?I*peK)
int j=stack[top--]; wJF$<f7P
int i=stack[top--]; A3 zNUad;
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pivotIndex=(i+j)/2; hpticW|
pivot=data[pivotIndex]; ;<`
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SortUtil.swap(data,pivotIndex,j); (yz8}L3
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//partition " 2@Ys*e
l=i-1; n]btazM{
r=j; Q1'D*F4
do{ t{/
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); O0"&wvR+5
SortUtil.swap(data,l,r); i)e)FhEY6
} O11.wLNH
while(l SortUtil.swap(data,l,r); q}5&B=2pM
SortUtil.swap(data,l,j); PiIILX{DuH
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if((l-i)>THRESHOLD){ bRAf!<3
stack[++top]=i; ,<-a 6
stack[++top]=l-1; Iyvl6
} n1c Q#u
if((j-l)>THRESHOLD){ M,UYDZ',
stack[++top]=l+1; 9$'Edi=6
stack[++top]=j; =j~}];I
} fmq^AnKd
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} RrqZ5Gonj
//new InsertSort().sort(data); qsL6*(S(r
insertSort(data); ts0K"xmY\c
} RbNRBK!{
/** d_Vwjv&@/"
* @param data ,K[B/tD{j
*/ }~5xlg$B<<
private void insertSort(int[] data) { Jh:-<xy)
int temp; E0S[TEDa]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1);
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} #$%gs]
} 'lNl><e-
} g@"6QAP
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} IA;KEGJ
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