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快速排序: Qu
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package org.rut.util.algorithm.support; <Ny DrO"C3
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import org.rut.util.algorithm.SortUtil; p\'0m0*
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/** ;+Dq3NE
* @author treeroot pmWt7 }
* @since 2006-2-2 +jEtu[ ;
* @version 1.0 tj'xjX
*/ 7R4t%^F
public class QuickSort implements SortUtil.Sort{ <:n!qQS6
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/* (non-Javadoc) B~CdY}UTsj
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *(,zPn,
*/ {
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public void sort(int[] data) { ]ZMFK>"^%
quickSort(data,0,data.length-1); RXi/&'+H
} )Ja&Y
private void quickSort(int[] data,int i,int j){ =O1py_m
int pivotIndex=(i+j)/2; ir{li?kV
//swap 5LF &C0v
SortUtil.swap(data,pivotIndex,j); bQvhBa?
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int k=partition(data,i-1,j,data[j]); <dD)>Y.
SortUtil.swap(data,k,j); r6b;v2!8
if((k-i)>1) quickSort(data,i,k-1); cXd?48O
if((j-k)>1) quickSort(data,k+1,j); ee}HQ.}Ja
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} 8PB 8h
/** FwjmC%iY
* @param data !RXG{1:
* @param i %w3Y!7+
* @param j 4:I'zR5
* @return ^pysoaZCT_
*/ svaclkT=
private int partition(int[] data, int l, int r,int pivot) { *y0=sG1+D
do{
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while(data[++l] while((r!=0)&&data[--r]>pivot); F"ua`ercI
SortUtil.swap(data,l,r); :~{Nf-y0`1
} Q,m&XpZ
while(l SortUtil.swap(data,l,r); J#*%r)
return l; rRQKW_9mB
} MQY}}a-oug
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} 2.2G79U,
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改进后的快速排序: \-W|)H
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package org.rut.util.algorithm.support; W^k|*Y|
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import org.rut.util.algorithm.SortUtil; %K[u
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/** ,\RZ+kC>~
* @author treeroot s# 9*`K
* @since 2006-2-2 pQNTN.L9NZ
* @version 1.0 -<{;.~nI.
*/ u85dG7
public class ImprovedQuickSort implements SortUtil.Sort { cuoZ:Wh
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private static int MAX_STACK_SIZE=4096; >]}c,4D(
private static int THRESHOLD=10; (MGYX_rD
/* (non-Javadoc) EY^+ N>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1=Z, #r
*/ rizWaw5E!8
public void sort(int[] data) { 0,]m.)ws
int[] stack=new int[MAX_STACK_SIZE]; f.G"[p
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int top=-1; \0fk^
int pivot; #/0d
int pivotIndex,l,r; O>3f*Cc
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stack[++top]=0; O%)Wo?)HM
stack[++top]=data.length-1; ["1Iz{
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while(top>0){ 9SQcChG~j
int j=stack[top--]; fZgEJsr
int i=stack[top--]; L}\ oFjVju
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pivotIndex=(i+j)/2; >pm`(zLn
pivot=data[pivotIndex]; ".7\>8A#a
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SortUtil.swap(data,pivotIndex,j); mlO\wn-F
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//partition &e\UlM22
l=i-1; X.GK5Phd
r=j; uZml.#@4
do{ phi9/tO\u
while(data[++l] while((r!=0)&&(data[--r]>pivot)); O^~Z-;FA
SortUtil.swap(data,l,r); E*"oA1/I
} >/+R~ n
while(l SortUtil.swap(data,l,r); yA]OX" T?*
SortUtil.swap(data,l,j); 1d 1
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if((l-i)>THRESHOLD){ (H6Mi.uZ
stack[++top]=i; V [Wo9Y\
stack[++top]=l-1; ;-^8lWt
} ~0Z.,p_
if((j-l)>THRESHOLD){ KA? J:
stack[++top]=l+1; lw43|_'G-t
stack[++top]=j; %j/}e>$"Nk
} d]K$0HY
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} P?hB`5X
//new InsertSort().sort(data); +-:o+S`q~
insertSort(data); QTospHf`
} !LJ4
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/** -sxu7I
* @param data ^Rb*mI
*/ >0JCu^9
private void insertSort(int[] data) { J,*+Ak
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int temp; hrW2#v
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 8 .t3`FGH
} %J8uVD.2
} Ip|=NQL>
} k_`h (R
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} UaB2vuL*=
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