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快速排序: 3JWHyo
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package org.rut.util.algorithm.support; 0`3ey*
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import org.rut.util.algorithm.SortUtil; TJ
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/** rbqH9 S
* @author treeroot T<mk98CdE
* @since 2006-2-2 N"2P&Ho]
* @version 1.0 o>\j c
*/ $Vlfg51 ob
public class QuickSort implements SortUtil.Sort{ {uDL"~^\
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/* (non-Javadoc) Xa Yx avq
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zZ[SC
*/ s[SzE6eQ`l
public void sort(int[] data) { q;}^Jpb;
quickSort(data,0,data.length-1); +d2+w1o^V
} 0 jVuFl
private void quickSort(int[] data,int i,int j){ _C)u#]t
int pivotIndex=(i+j)/2; psta&u\ q
//swap @|j`I1r.A
SortUtil.swap(data,pivotIndex,j); 7?]gUrE
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int k=partition(data,i-1,j,data[j]); L>).o%(R
SortUtil.swap(data,k,j); o%+KS5v!
if((k-i)>1) quickSort(data,i,k-1); 3|[:8
if((j-k)>1) quickSort(data,k+1,j); ;^=eiurv
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} tV[?WA[xt
/** tkR^dC
* @param data FJ!N)`[
* @param i AA^3P?iD
* @param j QtW5;A-h
* @return /ZvNgaH5M
*/ hOO)0IrIM*
private int partition(int[] data, int l, int r,int pivot) { Z5bmqhDo[
do{ @ J!)o d
while(data[++l] while((r!=0)&&data[--r]>pivot); KVSy^-."
SortUtil.swap(data,l,r); Rl=NVo
} Rqa#;wb!(
while(l SortUtil.swap(data,l,r); 6K[s),rdv
return l; Yc"G="XP;
} +VAfT\G2
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} +G7A.d`V}
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改进后的快速排序: mucY+k1>g
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package org.rut.util.algorithm.support; Y GO ;wIS
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import org.rut.util.algorithm.SortUtil; ZBJ.dK?Ky|
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/** B>o#eW
* @author treeroot 8Nd +
* @since 2006-2-2 7>9/bB+TL
* @version 1.0 3 ^{U:"N0
*/ 4<ER
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public class ImprovedQuickSort implements SortUtil.Sort { .Uh-Wi[
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private static int MAX_STACK_SIZE=4096; sog?Mvoq
private static int THRESHOLD=10; #v89`$#`2
/* (non-Javadoc) S;Lqx5Cd
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fdck/|`t
*/ xPq3Sfg`A
public void sort(int[] data) { ''?.6r
int[] stack=new int[MAX_STACK_SIZE]; ~N>[7I"*
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int top=-1; 6:330"9
int pivot; P`-(08t
int pivotIndex,l,r; :*/<eT_
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stack[++top]=0; |uj1T=ZY
stack[++top]=data.length-1; 7EI(7:gOn
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while(top>0){ U11rj,7
int j=stack[top--]; 0 m";=:(w
int i=stack[top--]; /U N%P2>^1
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pivotIndex=(i+j)/2; SKD!V6S
pivot=data[pivotIndex]; zp% MK+x
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SortUtil.swap(data,pivotIndex,j); 3|/ ;`KfQ
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