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快速排序: Tl/Dq(8JH
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package org.rut.util.algorithm.support; *]>OCGsr
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import org.rut.util.algorithm.SortUtil; g*w-"%"O
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/** *NwKD:o
* @author treeroot UQji7K }
* @since 2006-2-2 PU@U@
* @version 1.0 {C0OrO2:
*/ @=<TA0;LL
public class QuickSort implements SortUtil.Sort{ 2)I'5?I
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/* (non-Javadoc) C(%5,|6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g6a3MJV`
*/ c J"]yG)=
public void sort(int[] data) { rfZj8R&
quickSort(data,0,data.length-1); "]\":T
} BorfEv} SN
private void quickSort(int[] data,int i,int j){ ["#A -S
int pivotIndex=(i+j)/2; n
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//swap ^kR^
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SortUtil.swap(data,pivotIndex,j); 4K?H-Jco
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int k=partition(data,i-1,j,data[j]); gx>mKSzy
SortUtil.swap(data,k,j); 2G:{ FY
if((k-i)>1) quickSort(data,i,k-1); $RFu
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if((j-k)>1) quickSort(data,k+1,j); k~9Ywf
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} ID k:jO
/** TeN1\rA,
* @param data RWh}?vs_
* @param i \%4+mgiD
* @param j :#&U95EC0
* @return u2.r,<rC*Q
*/ 23n8,} H,
private int partition(int[] data, int l, int r,int pivot) { *
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do{ ofrlTw&o
while(data[++l] while((r!=0)&&data[--r]>pivot); kV(DnZ#jq
SortUtil.swap(data,l,r); I#6'
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} >0;"qT
while(l SortUtil.swap(data,l,r); XY t8vJ
return l; r;6YCI=z
} 0R^(rE"2#
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} 4z3$
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改进后的快速排序: Mp@(/
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package org.rut.util.algorithm.support; hr}R,BR|
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import org.rut.util.algorithm.SortUtil; v=Bh
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/** Ex s _LN
* @author treeroot *1$~CC7
* @since 2006-2-2 .L TFa.jxA
* @version 1.0 h}:5hi Jw
*/ {R8P $
public class ImprovedQuickSort implements SortUtil.Sort { 0@/E%T1c"
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private static int MAX_STACK_SIZE=4096; [t=+$pf(-
private static int THRESHOLD=10; ;51!aC
/* (non-Javadoc) .j<B5/+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E,?aBRxy
*/ ;<)-*?m9
public void sort(int[] data) { SFPIr0 u
int[] stack=new int[MAX_STACK_SIZE]; _TcQ12H 5<
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int top=-1; P;91C'T-x
int pivot; 4y}a,
int pivotIndex,l,r; Y&Vbf>Hi+
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stack[++top]=0; -Aym+N9
stack[++top]=data.length-1; *M!YQ<7G^d
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while(top>0){ )xy{[ K|M(
int j=stack[top--]; /Ta0}Y(y
int i=stack[top--]; Q+js2?7^
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pivotIndex=(i+j)/2; iwTBE]J
pivot=data[pivotIndex]; .;v'oR1x5
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SortUtil.swap(data,pivotIndex,j); TV>R(D3T/
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//partition nk,Mo5iqV
l=i-1; pC.P
r=j; `e;Sjf<
do{ CpdY)SMSL
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 5<8>G?Y
SortUtil.swap(data,l,r); q9z!g/,d/
} zyn =Xv@p
while(l SortUtil.swap(data,l,r); &MLhCekY
SortUtil.swap(data,l,j); =<uz'\Ytv%
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if((l-i)>THRESHOLD){ WG=r? xE
stack[++top]=i; qvE[_1QCc
stack[++top]=l-1; ['`'&+x&!
} ieoUZCO^r\
if((j-l)>THRESHOLD){ =` >Nfa+,
stack[++top]=l+1; L#MxB|fcr
stack[++top]=j; n8D;6#P^
} t4W0~7
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} bN%MT#X
//new InsertSort().sort(data); UHszOl
insertSort(data); U1tPw`0h
} f5XcBW9E
/** 0~5}F^8[L
* @param data uXa}<=O
*/ s/|'1E\F
private void insertSort(int[] data) { ebwoMG,B-
int temp; qGUe0(
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); #yOY&W:N
} \Le#+P
} zq>"a&Y,
} g[)hm`{?
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} l zknB
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