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快速排序: `N7erM
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package org.rut.util.algorithm.support; REX/:sB<
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import org.rut.util.algorithm.SortUtil; Uq%|v
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/** rTC| 8e
* @author treeroot P4MP`A
* @since 2006-2-2 6QPbmO]z
* @version 1.0 8z&/{:Z@pH
*/ f4X}F|!h
public class QuickSort implements SortUtil.Sort{ ?q'r9Ehe
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/* (non-Javadoc) |CS&H2!s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zZ<~yi3A9
*/ *D7oHwDU
public void sort(int[] data) { D*HK[_5
quickSort(data,0,data.length-1); )B@&q.2B=
} @X/-p3729
private void quickSort(int[] data,int i,int j){ z%6egi>
int pivotIndex=(i+j)/2; 3U?^49bJ
//swap %z
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SortUtil.swap(data,pivotIndex,j); "VsS-b^ P
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int k=partition(data,i-1,j,data[j]); Oh}@c~7;
SortUtil.swap(data,k,j); el^<M,7!
if((k-i)>1) quickSort(data,i,k-1); t!ZFpMv]n
if((j-k)>1) quickSort(data,k+1,j); q<fj1t1w
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} =Y3 d~~
/** 6|Rj
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* @param data w'5W L
* @param i ?GZ?HK|
* @param j gr>FLf
* @return R, zp&L
*/ 4
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private int partition(int[] data, int l, int r,int pivot) { fG7-07
do{ PO2]x:
while(data[++l] while((r!=0)&&data[--r]>pivot); 5'0kf7
SortUtil.swap(data,l,r); >R/^[([;]
} r^\Wo7q
while(l SortUtil.swap(data,l,r); \>eFs} Y/
return l; D>wo>,G
} .B$3y#TOb
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} =4x-x nA
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改进后的快速排序: %ZlnGr
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package org.rut.util.algorithm.support; 5_L43-
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import org.rut.util.algorithm.SortUtil; ~-(X\:z}
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/** JAL"On#c#0
* @author treeroot Cmj `WSSa
* @since 2006-2-2 'ka"0~:NS{
* @version 1.0 9l7 youZ]
*/ Q[Tbdc%1EG
public class ImprovedQuickSort implements SortUtil.Sort { VqB9^qJ]!
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private static int MAX_STACK_SIZE=4096; iB'g7&,L
private static int THRESHOLD=10; O{G $]FtF
/* (non-Javadoc) Fg^zz*e
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [
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*/ %{P." ki
public void sort(int[] data) { w?p8)Q6m
int[] stack=new int[MAX_STACK_SIZE]; OoAZ t
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int top=-1; e}"k8 ./
int pivot; jM(!!AjpC
int pivotIndex,l,r; inx0W3d"T
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stack[++top]=0; "}UYsXg
stack[++top]=data.length-1; pvd9wKz
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while(top>0){ Yf^/YLLS
int j=stack[top--]; O[')[uo8s
int i=stack[top--]; gq?~*4H
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pivotIndex=(i+j)/2; Rv+p4RgA
pivot=data[pivotIndex]; ?x =Sm|Ej
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SortUtil.swap(data,pivotIndex,j); 9\NP)Vm$^
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//partition V -9z{
l=i-1; qS2]|7q?Tc
r=j; xZ&S7G1