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快速排序:
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package org.rut.util.algorithm.support; |jB]5ciT
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import org.rut.util.algorithm.SortUtil; `L<f15][
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/** klHOAb1
* @author treeroot APxy%0Q
* @since 2006-2-2 i!
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* @version 1.0 vt{s"\f
*/ ;0*T7l
public class QuickSort implements SortUtil.Sort{ 9y=$|"<(
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/* (non-Javadoc) *&p `8:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Dw}8ci'
*/ gM=oH
public void sort(int[] data) { o6f^DG3*
quickSort(data,0,data.length-1); w)I!q&`Y
} L \0nO i
private void quickSort(int[] data,int i,int j){ WBTdQG
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int pivotIndex=(i+j)/2; <3\t J
//swap $47cKit|k:
SortUtil.swap(data,pivotIndex,j); (lv|-Phc.
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int k=partition(data,i-1,j,data[j]); `P;fD/I
SortUtil.swap(data,k,j); i<<NKv8;
if((k-i)>1) quickSort(data,i,k-1); B"N8NVn
if((j-k)>1) quickSort(data,k+1,j); f:5(M@iO.
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}
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/** 9( ;lcOz
* @param data a<+Qw'
* @param i $<^4G
* @param j ]'Y
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* @return 0gNwC~IA8
*/ I}oxwc
private int partition(int[] data, int l, int r,int pivot) { [\N,ow,n
do{ b
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while(data[++l] while((r!=0)&&data[--r]>pivot); .<JD'%?"
SortUtil.swap(data,l,r); j^A0[:2
} gE8=#%1<
while(l SortUtil.swap(data,l,r); SF*!Z2K
return l; ahgm*Cpc
} cy=,Dr9O
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} :CEhc7gU
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改进后的快速排序: d!)
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package org.rut.util.algorithm.support; Nx4_Oc^hY
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import org.rut.util.algorithm.SortUtil; \~ O6S`,
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/** kJIKULf
* @author treeroot k)\Yl`4au
* @since 2006-2-2 |YjuaXd7N
* @version 1.0 s]Z/0:`
*/ LL Oe
public class ImprovedQuickSort implements SortUtil.Sort { !?B9 0(
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private static int MAX_STACK_SIZE=4096; ;;BQuG
private static int THRESHOLD=10; +s&+G![
/* (non-Javadoc) w2y{3O"p=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) KfJF9!U*?
*/ mMO:m8W
public void sort(int[] data) { K V^`
int[] stack=new int[MAX_STACK_SIZE]; G`E%uyjG$j
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int top=-1; N,|:=gD_
int pivot; @;x|+@r
int pivotIndex,l,r; ,c_[`q\
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stack[++top]=0; Bt|S!tEy
stack[++top]=data.length-1; z<_{m4I;
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while(top>0){ b8)>:F
int j=stack[top--]; }S'+Ytea
int i=stack[top--]; s9)
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pivotIndex=(i+j)/2; 4A0R07"
pivot=data[pivotIndex]; e#L/
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SortUtil.swap(data,pivotIndex,j); $A6'YgK
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//partition $Hqm 09w
l=i-1; S:{hgi,T*
r=j; [r_,BH\nu
do{ m *8[I
while(data[++l] while((r!=0)&&(data[--r]>pivot)); +g ovnx
SortUtil.swap(data,l,r); ~Bn#AkL
} "
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while(l SortUtil.swap(data,l,r); FX )g\=ov
SortUtil.swap(data,l,j); yNdtq\h
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if((l-i)>THRESHOLD){ 2;.7c+r0
stack[++top]=i;
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stack[++top]=l-1; c ;`
} 7}(LO^,A
if((j-l)>THRESHOLD){ P:t|'t
stack[++top]=l+1; 4%2QF F@
stack[++top]=j; (.7_`T6QG
} h";G vjy
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} /Q5pAn -u
//new InsertSort().sort(data); vV.'&."g
insertSort(data); 3toY #!1Ch
} vjaIFyj
/** GEfX,9LF &
* @param data bmna*!l^M
*/ V|
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private void insertSort(int[] data) { XLp tJ4~v
int temp;
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); $ t_s7
} )zI<C=])"
} g*\u8fpRq
} "t~I;%$[
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}
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