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快速排序: r#p9x[f<Y
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package org.rut.util.algorithm.support; EW OVx*l
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import org.rut.util.algorithm.SortUtil; j</: WRA`]
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/** *i%.;Z"
* @author treeroot %5n_
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* @since 2006-2-2 Xl#ggub?
* @version 1.0 E{`fF8]K
*/ G9cUD[GB
public class QuickSort implements SortUtil.Sort{ IOmfF[
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/* (non-Javadoc) ]w8(&,PP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) KkbD W3-
*/ b]#AI
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public void sort(int[] data) { hL{KRRf>
quickSort(data,0,data.length-1); \r+
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} [RhO$c$[\
private void quickSort(int[] data,int i,int j){ ea
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int pivotIndex=(i+j)/2; ^}o 2
//swap ",; H`V
SortUtil.swap(data,pivotIndex,j); ~B?y{
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int k=partition(data,i-1,j,data[j]); Ve; n}mJ?
SortUtil.swap(data,k,j); /
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if((k-i)>1) quickSort(data,i,k-1); @qAS*3j
if((j-k)>1) quickSort(data,k+1,j); *^ZV8c}
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} VU3upy<
/** `Ggbi4),
* @param data JK5gQ3C[
* @param i
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* @param j bWU'cw
* @return VpDbHAg
*/ h*](a_0
private int partition(int[] data, int l, int r,int pivot) { iqWQ!r^
do{ on`3&0,.
while(data[++l] while((r!=0)&&data[--r]>pivot); 6LIJQ
SortUtil.swap(data,l,r); HIZe0%WPw
} Kn1a>fLaJ_
while(l SortUtil.swap(data,l,r); E ~<JC"]
return l; 0M[EEw3
} '5$b-x6 F
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} Vt#.eL)Ee
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改进后的快速排序: |@d\S[~ ^G
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package org.rut.util.algorithm.support; &V/MmmT
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import org.rut.util.algorithm.SortUtil; k5pN
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/** 2\{zmc}G-0
* @author treeroot uKHxe~
* @since 2006-2-2 DB}eA N/
* @version 1.0 4H&+dRI"
*/ Rima;9.Y0
public class ImprovedQuickSort implements SortUtil.Sort { AoxA+.O
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private static int MAX_STACK_SIZE=4096; m9rp8r*e
private static int THRESHOLD=10; T_4/C2
/* (non-Javadoc) ,k3FRes3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ISvpQ 3{)s
*/ 0 kW,I
public void sort(int[] data) { ]}Yl7/gM1}
int[] stack=new int[MAX_STACK_SIZE]; "4{r6[dn
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int top=-1; }BP;1y6-r
int pivot; KbeC"mi
int pivotIndex,l,r; 8$}<, c(
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stack[++top]=0; C?eH]hkZ3
stack[++top]=data.length-1; <Q3c[ Y
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while(top>0){ 7qS)c}Q\
int j=stack[top--]; Y}wyw8g/
int i=stack[top--]; G4"F+%.
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pivotIndex=(i+j)/2; Cw&KVw*
pivot=data[pivotIndex]; G"A#Q"
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SortUtil.swap(data,pivotIndex,j); a\*yZlXKs
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//partition w``U=sfmV
l=i-1; >^3i|PB
r=j; Qo|\-y-#
do{ PCtzl)
while(data[++l] while((r!=0)&&(data[--r]>pivot)); k!Y, 63V=
SortUtil.swap(data,l,r); 7@W>E;go
} H<+TR6k<
while(l SortUtil.swap(data,l,r); Xsa].
SortUtil.swap(data,l,j); cw
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if((l-i)>THRESHOLD){ dSHDWu&
stack[++top]=i; G18b$z
stack[++top]=l-1; TB31-
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} La[V$+Y
if((j-l)>THRESHOLD){ 3ckclO\|>
stack[++top]=l+1; `Urhy#LC
stack[++top]=j; < =IFcN
} 7b+6%fV
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} &$H!@@09|w
//new InsertSort().sort(data); =7UsVn#o
insertSort(data); J#83 0r(-
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/**
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* @param data B%68\
*/ I7]8Y=xf
private void insertSort(int[] data) { ftSW
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int temp; v`T
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Zv{'MIv&v
} wC'Szni
} -mh3DhJ,
} *{5fq_
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