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快速排序: +uLo~GdbE
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package org.rut.util.algorithm.support; Agi1r]W
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import org.rut.util.algorithm.SortUtil; 8zc!g|5"
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/** P+b^;+\1s
* @author treeroot %b{!9-n}
* @since 2006-2-2 ^ Wl/
* @version 1.0 *.*:(7`
*/ DO\EB6xH>%
public class QuickSort implements SortUtil.Sort{ J7\q#] ?
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/* (non-Javadoc) $1?X%8V
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~d8>#v=Q`
*/ e6R"W9
public void sort(int[] data) { pMB=iS<E
quickSort(data,0,data.length-1); 7P`1)juA9
} (Z$6JNkz
private void quickSort(int[] data,int i,int j){ >o} ati
int pivotIndex=(i+j)/2; 2:N_c\Vi
//swap q],R6GcVr
SortUtil.swap(data,pivotIndex,j); P\s+2/
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int k=partition(data,i-1,j,data[j]); W<LaR,7
SortUtil.swap(data,k,j); >ek%P;2w>
if((k-i)>1) quickSort(data,i,k-1); vf yva
if((j-k)>1) quickSort(data,k+1,j); 2wBU@T1
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} yo.SPd="Vx
/** ,>UmKrYo
* @param data *i{.@RX?
* @param i ->hxHr`!%a
* @param j m6x. "jG
* @return Yy)a,clZ*$
*/
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private int partition(int[] data, int l, int r,int pivot) { 3kQ ^f=Wd
do{ .V3Dql@z"
while(data[++l] while((r!=0)&&data[--r]>pivot); l1)pr{A
SortUtil.swap(data,l,r); .O#lab`:2
} 'U"3'jh
while(l SortUtil.swap(data,l,r); Gx!RaZ1
return l; NACY;XQ%
} 5dp#\J@
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} GF!{SO4
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改进后的快速排序: v,+l xY
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package org.rut.util.algorithm.support; N ]7a=
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import org.rut.util.algorithm.SortUtil; a1`cI5n
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/** tTFoS[V
* @author treeroot 93Gur(j^
* @since 2006-2-2 3K!0 4\
* @version 1.0 |2<f<k/UT
*/ $cOD6Xr)d
public class ImprovedQuickSort implements SortUtil.Sort { 1:!rw,Jzl`
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private static int MAX_STACK_SIZE=4096; T+nC>}*jgJ
private static int THRESHOLD=10; 0o|,& K
/* (non-Javadoc) _A|\.(t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g$"eI/o
*/ C9H11g7{
public void sort(int[] data) { <M OL{jan
int[] stack=new int[MAX_STACK_SIZE]; ,;P`Mf'YC
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int top=-1; 4<g72| y
int pivot; >.hGoT!_k
int pivotIndex,l,r; HCIF9{o1j>
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stack[++top]=0; fJw=7t-t
stack[++top]=data.length-1; 56Y5kxmi
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while(top>0){ (I[h.\%
int j=stack[top--]; '(pdk
int i=stack[top--]; d+2O^of:T
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pivotIndex=(i+j)/2; h==GdS4
pivot=data[pivotIndex]; M y"!j,Up
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SortUtil.swap(data,pivotIndex,j); 9T,QWk
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//partition a61eH )a
l=i-1; {qWG^Db
r=j; ?SO F
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do{ m=iov2K>
while(data[++l] while((r!=0)&&(data[--r]>pivot)); P>T*:!s ;
SortUtil.swap(data,l,r); h!N&gZ[0
} y]YS2^
while(l SortUtil.swap(data,l,r); wt.{Fqm
SortUtil.swap(data,l,j); M}oj!xGB
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if((l-i)>THRESHOLD){ ,q@(L
stack[++top]=i; &/hr-5k
stack[++top]=l-1; ar
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} y[WYH5&DJ
if((j-l)>THRESHOLD){ D
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stack[++top]=l+1; mYjiiql~
stack[++top]=j;
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} 9h38`*Im;
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} yFU2'pB
//new InsertSort().sort(data); NVA`t]gn
insertSort(data);
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} {.D2ON
/** 8cBW] \ v
* @param data %c&Ah
*/ )|h;J4V
private void insertSort(int[] data) { <,X+`m&
int temp; ]b~2Dap
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); YV3TxvXMR
} h,'mN\6t
} Z:Y.":[
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} h
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} 9 /Ai(
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