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快速排序: DxT8;`I%
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package org.rut.util.algorithm.support; 7!`,P
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import org.rut.util.algorithm.SortUtil; M: qeqn+
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/** ?y7x#_Exc
* @author treeroot `2?9eXC
* @since 2006-2-2 :'!,L0I|t
* @version 1.0 kQ~*iY
*/ $aX}i4F
public class QuickSort implements SortUtil.Sort{ IXugnvyV
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/* (non-Javadoc) 2mbZ6'p {
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) hX]vZR&R
*/ `bffw:;%
public void sort(int[] data) { =LS?:Mhm
quickSort(data,0,data.length-1); 40oRO0p
} -Vk+zEht
private void quickSort(int[] data,int i,int j){ nqt;Ge
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int pivotIndex=(i+j)/2; &V[m{.
//swap 2*5Z|
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SortUtil.swap(data,pivotIndex,j); ~w'M8(
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int k=partition(data,i-1,j,data[j]); `Xnu("w)
SortUtil.swap(data,k,j);
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if((k-i)>1) quickSort(data,i,k-1); Qj?FUxw
if((j-k)>1) quickSort(data,k+1,j); d:6?miMH]t
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} l-"$a8jn2
/** mV}
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* @param data Q9Wa@gi|
* @param i 1j<=TWit
* @param j G_g~-[O
* @return J
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*/ auqM>yx
private int partition(int[] data, int l, int r,int pivot) { ao<@a{G
do{ BM#cosV7%h
while(data[++l] while((r!=0)&&data[--r]>pivot); "8aw=3A
SortUtil.swap(data,l,r); iNgHx[*?
} [:
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while(l SortUtil.swap(data,l,r); *BT-@V.4
return l; =usx' #rb
} 2![.Kbqa%
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} 'c\zWmAZ
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改进后的快速排序: Aq}]{gfQ1
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package org.rut.util.algorithm.support; n0kBLn
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import org.rut.util.algorithm.SortUtil; zo&'2I
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/** &)O X*y
* @author treeroot ._"U{
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* @since 2006-2-2 ](4V3w.
* @version 1.0 HiEXw}Hkz
*/ |0ahvsrtW
public class ImprovedQuickSort implements SortUtil.Sort { Funep[rA
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private static int MAX_STACK_SIZE=4096; v&%GK5j7O
private static int THRESHOLD=10; ]FvN*@lG
/* (non-Javadoc) [nxjPx9-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )R+@vh#Q<$
*/ W\o(f W
public void sort(int[] data) {
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int[] stack=new int[MAX_STACK_SIZE]; xXM`f0s@+]
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int top=-1; l=[<gPE
int pivot; =9GL;z:R+
int pivotIndex,l,r; h*{{_3,
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stack[++top]=0; EX7cjQsml
stack[++top]=data.length-1; CE:TQzg
*[(O&L&0
while(top>0){ +Cl(:kfYB
int j=stack[top--]; 4r`u@
int i=stack[top--]; l2U"4d!o
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pivotIndex=(i+j)/2; 5V4Ze;K
pivot=data[pivotIndex]; z,[4BM
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SortUtil.swap(data,pivotIndex,j); 0~Ot
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//partition s={AdQ
l=i-1; hgX@?WWR
r=j; 1 e1$x@\\
do{ IL?3>$,
while(data[++l] while((r!=0)&&(data[--r]>pivot)); v{^_3
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SortUtil.swap(data,l,r); wP- pFc
} f@T/^|`mh
while(l SortUtil.swap(data,l,r); hWwh`Vw%
SortUtil.swap(data,l,j); }9
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if((l-i)>THRESHOLD){ }x`W+r
stack[++top]=i; K?,eIZ{.S
stack[++top]=l-1; \@vR*E
} RyKsM.
if((j-l)>THRESHOLD){ V03U"eI="
stack[++top]=l+1; ttuQ,SD
stack[++top]=j; \B8tGog
} nVko]y
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} r4k=i4
//new InsertSort().sort(data); X"YH49?
insertSort(data); '+N!3r{G
} kG/:fP
/** }$s#H{T!
* @param data \dTX%<5D
*/ lcHwKd
private void insertSort(int[] data) { rlmzbIuI9
int temp; +',[q
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); M5s>;q)
} j|TcmZGO
} N}b/;Y
} kB{
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} S(eCG2gR
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