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快速排序: cA]Ch>]A%
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package org.rut.util.algorithm.support; {%Ujp9i
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import org.rut.util.algorithm.SortUtil; V-
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/** vhaUV#V"
* @author treeroot Gaxa~?ek
* @since 2006-2-2 >iIUS
* @version 1.0 Up|>)WFw"
*/ 06peo
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public class QuickSort implements SortUtil.Sort{ ,H+LE$=
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/* (non-Javadoc) z`Cq,Sz/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) KB^i=+xr
*/ Jxy94y*
public void sort(int[] data) { 7/$s!pV
quickSort(data,0,data.length-1); !j|93*
} ,J0BG0jB^u
private void quickSort(int[] data,int i,int j){ Q]]5\C.
int pivotIndex=(i+j)/2; sXaIQhZ
//swap xjDV1Xf*
SortUtil.swap(data,pivotIndex,j); }|7y.*
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int k=partition(data,i-1,j,data[j]); E-_Q3^
SortUtil.swap(data,k,j); &R
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if((k-i)>1) quickSort(data,i,k-1); 3h|:ew[
if((j-k)>1) quickSort(data,k+1,j); `/z6Q"
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} Ka"Z,\T
/** '~ {x n
* @param data $"/xi `
* @param i :z!N_]t
* @param j u0(PWCi2
* @return CK+GD "Z$
*/ Vp'Zm:
private int partition(int[] data, int l, int r,int pivot) { 9w=GB?/
do{ }(r%'(.6
while(data[++l] while((r!=0)&&data[--r]>pivot);
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SortUtil.swap(data,l,r); &l=%*`On
} =k1 ,jn+
while(l SortUtil.swap(data,l,r); y2U^7VrO
return l; <?UIux
} 0DBA 'Cv
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} m"<Sb,"x!
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改进后的快速排序: lKMOsr@l
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package org.rut.util.algorithm.support; {/C
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import org.rut.util.algorithm.SortUtil; V #0F2GV<,
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/** "Z&-:1tP{9
* @author treeroot :[1^IH(sb
* @since 2006-2-2 ' {L5 3cH=
* @version 1.0 :K ^T@F5n
*/ GnlP#;
public class ImprovedQuickSort implements SortUtil.Sort { bm>,$GW(
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private static int MAX_STACK_SIZE=4096; Lbka*@
private static int THRESHOLD=10; G k9Y{
/* (non-Javadoc) [4NJ]r M%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R&cOhUj22J
*/ ze<Lc/ ;X~
public void sort(int[] data) { i+$G=Z#3E
int[] stack=new int[MAX_STACK_SIZE];
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int top=-1; QkXnXu
int pivot; o~#cpU4{o
int pivotIndex,l,r; Jhclg0q
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stack[++top]=0; hjVct
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stack[++top]=data.length-1; zI5#'<n
U~j:b {
while(top>0){ d{cd+An
int j=stack[top--]; /DG+8u
int i=stack[top--]; *C81DQ
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pivotIndex=(i+j)/2; &@tD/Jw3
pivot=data[pivotIndex]; :a M
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SortUtil.swap(data,pivotIndex,j); kiLwN
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//partition <l/QS3M
l=i-1; /gkHV3}fu
r=j; :+%"kgJNL
do{ 4K_rL{s0U
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 'Vwsbm
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SortUtil.swap(data,l,r); :DI``]Si\
} KMO(f!?
while(l SortUtil.swap(data,l,r); i6L>,^Dg
SortUtil.swap(data,l,j); `nAR/Ye
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if((l-i)>THRESHOLD){ D00I!D16
stack[++top]=i; B?BB
stack[++top]=l-1; >K
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} 00Tm]mMQX
if((j-l)>THRESHOLD){ kvWP[! j?)
stack[++top]=l+1; k3F*D
stack[++top]=j; ~*OQRl6F
} \LYB% K}
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} C-i9F%..
//new InsertSort().sort(data); .lclW0*
insertSort(data); oy8L{8?
} C|#GODA
/** F't4Q
* @param data x=1Iuc;&3
*/ HeV6=
private void insertSort(int[] data) { @>>8CU^~
int temp; :@BAiKa[wa
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); tPv3nh
} dQX<X}
} 5*M3sN
} pKeK6K\8
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} F1m 1%
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