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快速排序: aC[G_ACwc
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package org.rut.util.algorithm.support; k)-+ZmMOh
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import org.rut.util.algorithm.SortUtil; B{&W|z{$
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/** {.$7g8]I
* @author treeroot tV(iC~/
* @since 2006-2-2 -:%QoRCy
* @version 1.0 C/Q20
*/ 0a89<yX
public class QuickSort implements SortUtil.Sort{ "O>~osj
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/* (non-Javadoc) "b`#RohCi
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) dh`s^D6Q>
*/ [T_[QU:A
public void sort(int[] data) { e#Ao]gc
quickSort(data,0,data.length-1); jdG2u
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} HSNj
private void quickSort(int[] data,int i,int j){ G,!j P2S
int pivotIndex=(i+j)/2; ^ slIR!L
//swap LSc^3=X
SortUtil.swap(data,pivotIndex,j); ^WB[uFt-
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int k=partition(data,i-1,j,data[j]); ?I^$35
SortUtil.swap(data,k,j); Bbs1U
if((k-i)>1) quickSort(data,i,k-1); 0]7jb_n1
if((j-k)>1) quickSort(data,k+1,j); 6Sd:5eTEQ
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} :G 5p`;hGo
/** K*j
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* @param data ^5]9B<i[Y
* @param i #6\mTL4vg
* @param j
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* @return \;Q(o$5<
*/ Jn{)CZ
private int partition(int[] data, int l, int r,int pivot) { O~qRHYv
do{ u;$qJjS
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while(data[++l] while((r!=0)&&data[--r]>pivot); lVT*Ev{&.
SortUtil.swap(data,l,r); 4ct-K)Ris
} !QwB8yK@
while(l SortUtil.swap(data,l,r); <lFHmi$qt{
return l; NOs00 H
} ?MFC(Wsh
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改进后的快速排序: &'12,'8
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package org.rut.util.algorithm.support; Zuzwc [Z1
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import org.rut.util.algorithm.SortUtil; (nLzWvN
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/** c\ZI
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* @author treeroot [,Rc&7p~R
* @since 2006-2-2 1sg:8AA
* @version 1.0 wp }Q4I
*/ ys[xR=nbD
public class ImprovedQuickSort implements SortUtil.Sort { k:?)0Uh%^
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private static int MAX_STACK_SIZE=4096; #@HlnF}T
private static int THRESHOLD=10; u|wl;+.
/* (non-Javadoc) z{3`nd,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) h$`m0-'
*/ HR?T
public void sort(int[] data) { Wy-_}wqHg
int[] stack=new int[MAX_STACK_SIZE]; AAfU]4u0S
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int top=-1; |e#W;q$v
int pivot; RDSC @3%
int pivotIndex,l,r; 392(N(
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stack[++top]=0; ?wkT=mv
stack[++top]=data.length-1; G!VEV3zT
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while(top>0){ !j7mY9x+
int j=stack[top--]; p,z>:3M
int i=stack[top--]; uzQj+Po
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pivotIndex=(i+j)/2; 5GAW3j{
pivot=data[pivotIndex];
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SortUtil.swap(data,pivotIndex,j); r Yt|[Pk
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//partition x_O:IK.>
l=i-1; }~LGq.H
r=j; On
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do{ >.UEs8QV
while(data[++l] while((r!=0)&&(data[--r]>pivot)); DW,ERQ^
SortUtil.swap(data,l,r); d1.@v;
} lmcgOTT):
while(l SortUtil.swap(data,l,r); XPrnQJ
SortUtil.swap(data,l,j); `&x>2FJ
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if((l-i)>THRESHOLD){ S@pdCH, n
stack[++top]=i; c[,Rhf
stack[++top]=l-1; ~1TT ?H
} =W')jKe0
if((j-l)>THRESHOLD){ t|V5[n!
stack[++top]=l+1; j8Q_s/n
stack[++top]=j; ^vh!1"T
} gcwJ{&
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} wG:RvgX}
//new InsertSort().sort(data); <z60EvHg
insertSort(data); 7>zUT0SS
} [H!do$[>
/** Z~(X[Zl
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* @param data V G7#C@>Z
*/ vt"bB
private void insertSort(int[] data) { &to~#.qc
int temp; b"o\-iUioe
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); I3.JAoB>!
} _0
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