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快速排序: (iS94}-)
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package org.rut.util.algorithm.support; 2+?M(=4
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import org.rut.util.algorithm.SortUtil; .+M4Pi
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/** /Hd\VI
* @author treeroot O~xc>
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* @since 2006-2-2 oHa6fi
* @version 1.0 lv8tS -
*/ 8\ :T*u3
public class QuickSort implements SortUtil.Sort{ "kN5AeRg
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/* (non-Javadoc) }S42.f.p
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7v\OS-
*/ khEHMvVH
public void sort(int[] data) { *?i~AXJm
quickSort(data,0,data.length-1); n
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} *np%67=jO
private void quickSort(int[] data,int i,int j){ 12rr:(#%s
int pivotIndex=(i+j)/2; lFRgyEPH
//swap w\\
SortUtil.swap(data,pivotIndex,j); P|64wq{B8
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int k=partition(data,i-1,j,data[j]); u37+B
SortUtil.swap(data,k,j); %_/_klxnO
if((k-i)>1) quickSort(data,i,k-1); ?EtK/6dJZt
if((j-k)>1) quickSort(data,k+1,j); B6ys5eQ
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} ,Ma$:6`f
/** 61wGIN2,
* @param data u/,m2N9cL
* @param i <GR]A|P
* @param j ZB%7Sr0
* @return <
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private int partition(int[] data, int l, int r,int pivot) { 8~4{e,} ,
do{ GadD*psD2
while(data[++l] while((r!=0)&&data[--r]>pivot); oFY'Ek;d
SortUtil.swap(data,l,r); b9"Q.*c<Z^
} ousoG$Pc
while(l SortUtil.swap(data,l,r); EW YpYMkm
return l; `VS/Xyp
} 30B!hj$C
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} 3:76x
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改进后的快速排序: N b+zP[C
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package org.rut.util.algorithm.support; /)v X|qtIY
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import org.rut.util.algorithm.SortUtil; okfhd{9
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/** |qZ4h7wL
* @author treeroot Aw >DZ2
* @since 2006-2-2 'Z;R!@Dm
* @version 1.0 U?.VY@
*/ '{C=vW
public class ImprovedQuickSort implements SortUtil.Sort { ,@GI3bl
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private static int MAX_STACK_SIZE=4096; Plt~l3_
private static int THRESHOLD=10; ]Wfnpqc^
/* (non-Javadoc) ]V}";cm;2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ek3/`]V:
*/ 'S&5zwrH
public void sort(int[] data) { 539[,jH
int[] stack=new int[MAX_STACK_SIZE]; ga!t:O@w
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int top=-1; G;`+MgJ)
int pivot; |nv8&L8
int pivotIndex,l,r; 5J1,Usm
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stack[++top]=0; -u8 ma%JW
stack[++top]=data.length-1; \ocJJc9
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while(top>0){ -k!UcMWP
int j=stack[top--]; 0urQA_JC
int i=stack[top--]; fF<~2MiKw
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pivotIndex=(i+j)/2; z!?xz
pivot=data[pivotIndex]; $1/yc#w
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SortUtil.swap(data,pivotIndex,j); h\:"k_u#
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//partition qJrK?:O;
l=i-1; 'BtvT[KM
r=j; ~
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do{ _18) XR
while(data[++l] while((r!=0)&&(data[--r]>pivot)); *<]ulR2
SortUtil.swap(data,l,r); 8) 'OXR0/
} ;5dJ5_ }
while(l SortUtil.swap(data,l,r); s}X2*o`,
SortUtil.swap(data,l,j); 05$CIS>!
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if((l-i)>THRESHOLD){ 8,=,'gFO
stack[++top]=i; #sN]6
stack[++top]=l-1; #8rLB(
} >pUR>?t"
if((j-l)>THRESHOLD){ CKy' 8I9
stack[++top]=l+1; =`99ez+y
stack[++top]=j; }~y
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} GK~uoz:^O
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} |!,;IoZ
//new InsertSort().sort(data); 1F{c5
insertSort(data); X8"4)IZ3
} Z`T]jm-3
/** =YOq0
* @param data ^e1@o\]
*/ /&_$+Iun
private void insertSort(int[] data) { cY0NQKUk~
int temp; VMXccT9i!
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); -QN1=G4
} kq8.SvIb
} gwm!Pw j
} yX0nyhq
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