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快速排序: Cw~q4A6'
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package org.rut.util.algorithm.support; @Rg/~\ K
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import org.rut.util.algorithm.SortUtil; ;Y)w@bNt@
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/** M+-*QyCFK
* @author treeroot Zj_b>O-V
* @since 2006-2-2 I"xo*}
* @version 1.0 MO[2~`,Q!
*/ .[YuRLGz
public class QuickSort implements SortUtil.Sort{ .4S.>~^7
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/* (non-Javadoc) 1}"++Z73P
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LhN|1f:9:
*/ )z>|4@,
public void sort(int[] data) { SP@ >vl+;
quickSort(data,0,data.length-1); x-XD.qh7Hr
} FOb0uj=(v
private void quickSort(int[] data,int i,int j){ "WlZ)wyF%
int pivotIndex=(i+j)/2; fAF1"4f
//swap f}6s
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SortUtil.swap(data,pivotIndex,j); 5sdn[Tt##
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int k=partition(data,i-1,j,data[j]); /Jta^Bj
SortUtil.swap(data,k,j); =NpYFKmMhV
if((k-i)>1) quickSort(data,i,k-1); u\a#{G;Z
if((j-k)>1) quickSort(data,k+1,j); }pDqe;a{
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} 0*VWzH
/** 1f%1*L0>@
* @param data PYiU_
* @param i 3s5z
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* @param j $yN{-T"
* @return 9K.Vb1&
*/ EJj.1/]|r
private int partition(int[] data, int l, int r,int pivot) { !1rlN8w(qr
do{ m&xW6!x
while(data[++l] while((r!=0)&&data[--r]>pivot); GC<l#3+
SortUtil.swap(data,l,r); 2iHUZzz\
} P|^f0Rw3.
while(l SortUtil.swap(data,l,r); \@Ts+7%
return l; @#<D ^"
} ZLc -RM
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改进后的快速排序: Ut*`:]la
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package org.rut.util.algorithm.support; .RE:;<|w
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import org.rut.util.algorithm.SortUtil; 1!ii;s^e
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/** 4Fa~Aog
* @author treeroot PZ2;v<
* @since 2006-2-2 0[A[U_b
* @version 1.0 ;i8g41qjF
*/ Vl5`U'^qx
public class ImprovedQuickSort implements SortUtil.Sort { `
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private static int MAX_STACK_SIZE=4096; "
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private static int THRESHOLD=10; k;2GEa]w
/* (non-Javadoc) ?*2CpM&l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4<9=5 q]
*/ pSoiH<33
public void sort(int[] data) { VAWF3
int[] stack=new int[MAX_STACK_SIZE]; 5BWH-2HsB
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int top=-1; -jW.TT h]
int pivot; hwu]Er.gn
int pivotIndex,l,r; }]e-{C}
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stack[++top]=0; uvMy^_}L
stack[++top]=data.length-1; f) zn TJL
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while(top>0){ 8hXl%{6d3
int j=stack[top--]; ,eOB(?Ku
int i=stack[top--]; /rMI"khB
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pivotIndex=(i+j)/2; 34z"Pm
pivot=data[pivotIndex]; J3,fk)
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SortUtil.swap(data,pivotIndex,j); }
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//partition MTsM]o
l=i-1; 9`wZz~hL"
r=j; 4y)P>c
do{ ;LcVr13J/
while(data[++l] while((r!=0)&&(data[--r]>pivot)); A$<.a'&T!
SortUtil.swap(data,l,r); y6LWx:
} !LggIk1
while(l SortUtil.swap(data,l,r); B{|8#jqY
SortUtil.swap(data,l,j); ;fsZ7k4]do
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if((l-i)>THRESHOLD){ <%($7VMev
stack[++top]=i; @$lG@I,[
stack[++top]=l-1; >XK
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} kB3H="3[[
if((j-l)>THRESHOLD){ 3
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stack[++top]=l+1; ~$ng^D
stack[++top]=j; I`p+Qt
} [p{#XwN
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} (0j}-iaQEZ
//new InsertSort().sort(data); 1>*#%R?W
insertSort(data); SNfr"2c'h~
} |s"nM<ZNZ
/** 5Y.vJz
* @param data IAYR+c
*/ =G]1LTI
private void insertSort(int[] data) { |rJ=Ksc
int temp; A9f)tqbc
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); +g` 'J$
} .uuO>:
} _jJPbKz
} 3|WWo1
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} eCN })An
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