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快速排序: V7Z4T6j4
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package org.rut.util.algorithm.support; L4b:F0
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import org.rut.util.algorithm.SortUtil; DNR~_3Aq
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/** kM'"4[,nz
* @author treeroot HxBm~Lcqy
* @since 2006-2-2 &X|<@'933
* @version 1.0 .MVY B\6Q0
*/ $B#6tk~u
public class QuickSort implements SortUtil.Sort{ OFGsjYLw
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/* (non-Javadoc) Zes+/.sA}]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) o7TN,([W
*/ iJv48#'ii
public void sort(int[] data) { 2[B4f7
quickSort(data,0,data.length-1); d'*]ns
} uK("<u|
private void quickSort(int[] data,int i,int j){ H{?9CxYa
int pivotIndex=(i+j)/2; b$Hz3TJ(
//swap >#}2J[2HQ
SortUtil.swap(data,pivotIndex,j); ygSL
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int k=partition(data,i-1,j,data[j]); MlJVeod
SortUtil.swap(data,k,j); YB)3X[R+0
if((k-i)>1) quickSort(data,i,k-1); iB1i/l
if((j-k)>1) quickSort(data,k+1,j); c=[q(|+O!
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} $&Kq*m 0g
/** {SZ % Xb o
* @param data GIftrYr
* @param i C#i UP|7hh
* @param j 4KI [D{
* @return V8-h%|$p3W
*/ r7]"?#
private int partition(int[] data, int l, int r,int pivot) { =q(GHg;'
do{ maSgRf[g
while(data[++l] while((r!=0)&&data[--r]>pivot); 4'Xgk8)
SortUtil.swap(data,l,r); J$9:jE-4
} m-V02's
while(l SortUtil.swap(data,l,r); Nf9fb?
return l; +m,!e*g
} R4e&^tI@*
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} &hV Zx
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改进后的快速排序: x`Fjf/1T*m
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package org.rut.util.algorithm.support; Di Or{)a
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import org.rut.util.algorithm.SortUtil; F9XT
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/** Ulqh@CE)
* @author treeroot ujgLJ77
* @since 2006-2-2 9 1P4:6
* @version 1.0 AxCI 0
*/ N
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public class ImprovedQuickSort implements SortUtil.Sort { W7UtA.2LT
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private static int MAX_STACK_SIZE=4096; V!|e#}1/
private static int THRESHOLD=10; R[A5JQ$[
/* (non-Javadoc) FUeq
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +nZRi3yu=
*/ &1)xoZ'\
public void sort(int[] data) { O|v
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int[] stack=new int[MAX_STACK_SIZE]; -!*p*3|03|
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int top=-1; ;Gm>O7"|@
int pivot; `?o=*OS7Y
int pivotIndex,l,r; EIX\O6*
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stack[++top]=0; 6w#nkF
stack[++top]=data.length-1; ,5-Zb3\
;; LuU<,$
while(top>0){ B.-A $/
int j=stack[top--]; V
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int i=stack[top--]; W7!.#b(hU
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pivotIndex=(i+j)/2; /GsrGX8
pivot=data[pivotIndex]; 5u pShtC
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SortUtil.swap(data,pivotIndex,j); ~PUsgL^
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//partition T0L+z/N_m.
l=i-1;
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r=j; YeIe\3x!N
do{ Qg>L,ZO
while(data[++l] while((r!=0)&&(data[--r]>pivot)); _[$#
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SortUtil.swap(data,l,r); U2&HSE|2J
} kbq:U8+k
while(l SortUtil.swap(data,l,r); 8on[%Vk
SortUtil.swap(data,l,j); {F)E\)$G
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if((l-i)>THRESHOLD){ =|#w.(3y
stack[++top]=i; le2/Zs$
stack[++top]=l-1; T+BIy|O
} @fDQ^ 4
if((j-l)>THRESHOLD){ b.6ZfB,+G
stack[++top]=l+1; BGA%"b
stack[++top]=j; 45r|1<R o
} s9:%s*$u
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} <dJIq"){
//new InsertSort().sort(data); 9M0d+:YJ
insertSort(data); Ahd\TH
} B^Bbso'{1
/** d"p2Kx'*3
* @param data n1JC?+
*/ mj,qQ=n;p
private void insertSort(int[] data) { &Ky3Jb<:Gt
int temp; be_C>v
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); /W? z0tk`
} `L+~&M
} ,Os7T 1>
} 0\ZaMu #
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} &s