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快速排序: 1[`<JCFClc
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package org.rut.util.algorithm.support; .A/H+.H;
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import org.rut.util.algorithm.SortUtil; 6S[D"Q94
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/** *KH@u
* @author treeroot 8|NJ(D-$
* @since 2006-2-2 "%t`I)
* @version 1.0 r_E)HL/A
*/ Q$L(fHkw
public class QuickSort implements SortUtil.Sort{ 8Jj0-4]
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/* (non-Javadoc) p'k+0=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7~nCK
*/ ONiI:Z>%
public void sort(int[] data) { z44~5J]
quickSort(data,0,data.length-1); SYPMoE!U:
} l|em E
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private void quickSort(int[] data,int i,int j){ /*^|5>-`i1
int pivotIndex=(i+j)/2; Z;\"pP:
//swap ~J{[]wi
SortUtil.swap(data,pivotIndex,j); WUS9zK
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int k=partition(data,i-1,j,data[j]); E_1I|$
SortUtil.swap(data,k,j); A]%t0>EL<
if((k-i)>1) quickSort(data,i,k-1); arKmc@"X
if((j-k)>1) quickSort(data,k+1,j); S)@vl^3ec
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} '\B"g@if
/** "nno)~)u
* @param data gCr|e}w-
* @param i .{a2z*o
* @param j bK8F |
* @return {b0&qV
*/ 'A!/pUML
private int partition(int[] data, int l, int r,int pivot) { F(~_L.
do{ $uK"@Mw
while(data[++l] while((r!=0)&&data[--r]>pivot); */y]!<\v!k
SortUtil.swap(data,l,r); fbTw6Fde$
} dHF$T33It
while(l SortUtil.swap(data,l,r); fR%1FXpK&
return l; qK
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} _JTxm>
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改进后的快速排序: yL
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package org.rut.util.algorithm.support; OrEuQ-,i@
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import org.rut.util.algorithm.SortUtil; q,+kPhHEgy
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/** TT ZxkK
* @author treeroot ;GFB@I@
* @since 2006-2-2 )(Mr f{
* @version 1.0
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*/ #3yw
public class ImprovedQuickSort implements SortUtil.Sort { 83ic@[
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private static int MAX_STACK_SIZE=4096; 6eYf2sZ;J
private static int THRESHOLD=10; =l2Dm
/* (non-Javadoc) _c
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 66@3$P%1p
*/ s7nX\:Bw:
public void sort(int[] data) { h<'5q&y
int[] stack=new int[MAX_STACK_SIZE]; Oqpl2Y"/
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int top=-1; 5Sjr6l3Vq8
int pivot; sC5uA
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int pivotIndex,l,r; 4!~
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stack[++top]=0; 3E!<p
stack[++top]=data.length-1; "R2t&X[9
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while(top>0){ .d~]e2x
int j=stack[top--]; V l~Y
int i=stack[top--]; xPDA475Cw3
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pivotIndex=(i+j)/2; Vx6?@R
pivot=data[pivotIndex]; fHe0W
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SortUtil.swap(data,pivotIndex,j); Uy59zB2|=
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//partition ^/C$L8#
l=i-1; 3_\{[_W
r=j; H/Ec^Lc+_
do{ Bq~hV;9nf
while(data[++l] while((r!=0)&&(data[--r]>pivot)); e@:P2(WWl
SortUtil.swap(data,l,r); ?l,
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} -M:hlwha
while(l SortUtil.swap(data,l,r); q]N?@l]
SortUtil.swap(data,l,j); }>;ht5/i/
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if((l-i)>THRESHOLD){ ~S^X"8(U
stack[++top]=i; HLSfoQ&)v
stack[++top]=l-1; juCG?}di;
} XnE
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if((j-l)>THRESHOLD){ 9jMC|oE
stack[++top]=l+1;
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stack[++top]=j; ^s2m\Q(
} _[TH@fO6:
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} P('t6MVlT
//new InsertSort().sort(data); 1J-Qh<Q
insertSort(data); C'-zh\a
} OHHNWg_5
/** ," C[Qg(
* @param data $K?T=a;z
*/ )pjjW"C+
private void insertSort(int[] data) { lHcZi
int temp; #5y9L
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); {}g %"mi#
} Z(Eke
} \7,MZt
} $AA~]'O>6:
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} _oJ2]f6KX
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