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快速排序: ~ v21b?
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package org.rut.util.algorithm.support; y"o@?bny
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import org.rut.util.algorithm.SortUtil; UrhSX!g/A>
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/** MPxe|Wws
* @author treeroot h+<F,0
* @since 2006-2-2 {:!CA/0Jx
* @version 1.0 nTd[-3o
*/ wFHbz9|@I
public class QuickSort implements SortUtil.Sort{ #y4+O;{
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/* (non-Javadoc) cf7UV6D g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ',g'Tl^E
*/ <8_~60
public void sort(int[] data) { pk&;5|cCD
quickSort(data,0,data.length-1); i[\`]C{gf
} DGY?4r7>y
private void quickSort(int[] data,int i,int j){ zG0191f
int pivotIndex=(i+j)/2; q8_8rp-@
//swap xD|CQo}:
SortUtil.swap(data,pivotIndex,j); N)tqjq
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int k=partition(data,i-1,j,data[j]); >I^_kBa
SortUtil.swap(data,k,j); =SEgv;#KZ~
if((k-i)>1) quickSort(data,i,k-1); ( ;(DI^Un8
if((j-k)>1) quickSort(data,k+1,j); dRXEF6G
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} '9R.$,N
/** +uD4$Wt_F
* @param data 4{Q{>S*h
* @param i ivb?B,Lz0
* @param j =Co[pt
* @return q0a8=o"|
*/ s;[OR
private int partition(int[] data, int l, int r,int pivot) { 0K*|B.O
do{ 0qPbmLMK
while(data[++l] while((r!=0)&&data[--r]>pivot); }+wvZq +c
SortUtil.swap(data,l,r); -ghmLMS%t
} zZ11J0UI
while(l SortUtil.swap(data,l,r); ^zs]cFN#%
return l; u}:p@j}Zv
} F CbU> 1R
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} /`b(} m
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改进后的快速排序: 8M DX()Bm
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package org.rut.util.algorithm.support; /l)|B
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import org.rut.util.algorithm.SortUtil; `1T?\
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/** ;vDjd2@
* @author treeroot Oz:J8l%
* @since 2006-2-2 #,4CeD|(D,
* @version 1.0 )8rN
*/ GOII
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public class ImprovedQuickSort implements SortUtil.Sort { )PNeJf|@
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private static int MAX_STACK_SIZE=4096; 0M=U>g)
private static int THRESHOLD=10; M'"@l$[QM
/* (non-Javadoc) BnL [C:|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S.#IC
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*/ k m(Mv
public void sort(int[] data) { ZI0C%c.~
int[] stack=new int[MAX_STACK_SIZE]; t;?TXAA
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int top=-1; 42Vz6 k:
int pivot; X^!1MpEQ
int pivotIndex,l,r; I5$@1+B
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stack[++top]=0; JTw3uM, e
stack[++top]=data.length-1; ~$PQ8[=
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*6=[Z
while(top>0){ 06dk K)`
int j=stack[top--]; 0bt"U=x4
int i=stack[top--]; Y\sSW0ZX
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pivotIndex=(i+j)/2; I\|x0D
pivot=data[pivotIndex]; !&ly :v!
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SortUtil.swap(data,pivotIndex,j); +$b_,s
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//partition bc{ {a
l=i-1; EC]b]'._
r=j; .8O.
do{ 0)?.rthk4S
while(data[++l] while((r!=0)&&(data[--r]>pivot)); J!5>8I(_wX
SortUtil.swap(data,l,r); >C1**GQ
} (1|_Nr
while(l SortUtil.swap(data,l,r); xD#r5
SortUtil.swap(data,l,j); ;ZSJ-r
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if((l-i)>THRESHOLD){ YXdd=F
stack[++top]=i; KqE5{ q
stack[++top]=l-1; BJ]4j-^o
} :JEzfI1
if((j-l)>THRESHOLD){ k!^Au8Up?
stack[++top]=l+1; BM@:=>ypQ
stack[++top]=j; NFEF{|}BM
} [YsN c
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} #} )OnM^],
//new InsertSort().sort(data); _I&];WM\
insertSort(data); w,<nH:~
} xux
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/** bK7j"
* @param data ZP]l%6\.
*/ <ah!!
private void insertSort(int[] data) { BaLvlB
int temp; %B,>6 `[
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); h^tU*"
} O!3MXmaO
} ex-0@
} bw@"MF{
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} >sUavvJ~x
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