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快速排序: 1N{ >00
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package org.rut.util.algorithm.support; P!)F1U]!
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import org.rut.util.algorithm.SortUtil; ^)$T`
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/** }s#4m
* @author treeroot _W,?_"[R=
* @since 2006-2-2 rJtk4hOF
* @version 1.0 P.=Dd"La
*/ F4~O-g.<
public class QuickSort implements SortUtil.Sort{ h CV(O2jL
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/* (non-Javadoc) LJ 9#!r@H
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =+<DNW@%
*/ Wh"xt:
public void sort(int[] data) { ~H[_=
quickSort(data,0,data.length-1); .#K\u![@N
} <~svy)Cz
private void quickSort(int[] data,int i,int j){ Xg;<?g?k
int pivotIndex=(i+j)/2; y.gNjc
//swap ;7JyL|2
SortUtil.swap(data,pivotIndex,j); us<dw@P7{
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int k=partition(data,i-1,j,data[j]); c"Q9ob
SortUtil.swap(data,k,j); V4W(>g
if((k-i)>1) quickSort(data,i,k-1); D*_.4I
if((j-k)>1) quickSort(data,k+1,j); `Cy;/95m
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} *Ct
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/** G!Y7RjWD
* @param data >{rD3X"d
* @param i r-[YJzf@P
* @param j z_y@4B6>}
* @return 'k<~HQr
*/ Z%SDN"+'g
private int partition(int[] data, int l, int r,int pivot) { ?fpI,WFu
do{ %T;VS-f
while(data[++l] while((r!=0)&&data[--r]>pivot); |+<o(Q(
SortUtil.swap(data,l,r); [W dxMU
} k4^!"~<+0
while(l SortUtil.swap(data,l,r); S6_dmTV*
return l; 0nR_I^
} w'mn O'%
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} UVsF !0
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改进后的快速排序: Oe k$f,J-
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package org.rut.util.algorithm.support; `#j;\
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import org.rut.util.algorithm.SortUtil; nQfSQMg
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/** M=EV^Tw-=
* @author treeroot Of<Vr.m{R
* @since 2006-2-2 A2`Xh#o
* @version 1.0 rC ,ZRFF
*/ #g1,U7vv8
public class ImprovedQuickSort implements SortUtil.Sort { K#yCZ2
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private static int MAX_STACK_SIZE=4096; E1qf N>0Z
private static int THRESHOLD=10; ~(^?M
/* (non-Javadoc) VlxHZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g zyi'K<
*/ \YsLVOv%:d
public void sort(int[] data) { v.Q+4
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int[] stack=new int[MAX_STACK_SIZE]; 3nUC,T%
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int top=-1; @4]dv> Z
int pivot; - KaU@t
int pivotIndex,l,r; cA!o
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stack[++top]=0; 7X .B
stack[++top]=data.length-1; ]; B`'Ia
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while(top>0){ 5F1P|t#
int j=stack[top--]; zZPXI&,
int i=stack[top--]; 4z qO!nk
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pivotIndex=(i+j)/2; ]"\sd"
pivot=data[pivotIndex]; KU.F4I8}q
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SortUtil.swap(data,pivotIndex,j); aR%E"P-6l
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//partition "^VPe[lA
l=i-1; (;++a9GK
r=j; ^'hh?mL
do{ }>'1Qg
while(data[++l] while((r!=0)&&(data[--r]>pivot)); D<bHRtP
SortUtil.swap(data,l,r); l9{.~]V
} |v h{Kb@
while(l SortUtil.swap(data,l,r); YH0utc
SortUtil.swap(data,l,j); Ve[&_(fP
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if((l-i)>THRESHOLD){ }FC(Z-g
stack[++top]=i; 'L
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stack[++top]=l-1; f;,^
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} hx;0h&L
if((j-l)>THRESHOLD){ L#u!T)!zW
stack[++top]=l+1; m Wh
stack[++top]=j; -JXCO<~k
} R!RgQwEak
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} nSbcq>3
//new InsertSort().sort(data); JZoH -
insertSort(data); $HFimU,V=0
} 0JV|wd8j
/** ,4S6F HK
* @param data OZ Hfd7K4A
*/ +^|=MK%
private void insertSort(int[] data) { Iv>4o~t
int temp; u 9kh@0
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); JS(%:
} DG
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^
} p4wx&VLi
} Q;2n
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} |OO2>(Fj
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