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快速排序: mu
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package org.rut.util.algorithm.support; IgbuMEfL
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import org.rut.util.algorithm.SortUtil; XGZZKvp
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/** }d5]N
* @author treeroot /o4_rzR?
* @since 2006-2-2 %/2
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* @version 1.0 B>i%:[-e
*/ nDn+lWA=g
public class QuickSort implements SortUtil.Sort{ 91z=ou
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/* (non-Javadoc) 72|g zm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *$7^.eHfdd
*/ Y's=31G@
public void sort(int[] data) { Hl$qmq
quickSort(data,0,data.length-1); Y5E0n(Z
} bAt!S
private void quickSort(int[] data,int i,int j){ `
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int pivotIndex=(i+j)/2; U,b80%k:
//swap $U,]c
SortUtil.swap(data,pivotIndex,j); 3~`\FuHHe
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int k=partition(data,i-1,j,data[j]); ,8*A#cT
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SortUtil.swap(data,k,j); 0^{Tq0Ri[
if((k-i)>1) quickSort(data,i,k-1); '0f!o&?g
if((j-k)>1) quickSort(data,k+1,j); q!&:y7O8
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} ]>)}xfL &,
/** eZ)
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* @param data a/E(GQ,,
* @param i y2%[/L:u~
* @param j +
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* @return `LFT"qnp
*/ djf8FNnn
private int partition(int[] data, int l, int r,int pivot) { !o'a]8
do{ :V8oWMY
while(data[++l] while((r!=0)&&data[--r]>pivot); {(-TWh7V
SortUtil.swap(data,l,r); mmFcch$Jv
} >CCy2W^W
while(l SortUtil.swap(data,l,r); 0Wd5s{S
return l; ,9|7{j|u
} SFWS<H(IN
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} [9EL[}
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改进后的快速排序: }`whg8 fZ
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package org.rut.util.algorithm.support; cmf*BkS
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import org.rut.util.algorithm.SortUtil; ,vi6<C\
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/** }2y"F@{T
* @author treeroot };(2 na
* @since 2006-2-2 Rv*x'w
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* @version 1.0 ld~*w
*/ sN[q.M?
public class ImprovedQuickSort implements SortUtil.Sort { p<a~L~xH6
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private static int MAX_STACK_SIZE=4096; ,J*#Ixe}
private static int THRESHOLD=10; ue
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/* (non-Javadoc) bxz6
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tV.96P;)/9
*/ _#U hXXD
public void sort(int[] data) { xs
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int[] stack=new int[MAX_STACK_SIZE]; mnMY)-6C
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int top=-1; {7Ez7'SVV
int pivot; p t{/|P
int pivotIndex,l,r; ~o;*{ Q
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stack[++top]=0; n@e|PWu
stack[++top]=data.length-1; 5#? HL
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while(top>0){ BYDOTy/%nJ
int j=stack[top--]; ]\R%@FCYc
int i=stack[top--]; "6'# L,
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pivotIndex=(i+j)/2; F[|aDj@q e
pivot=data[pivotIndex]; c;7ekj
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SortUtil.swap(data,pivotIndex,j); v?1xYG@1
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//partition ~_L_un.R
l=i-1; Yg7C"3;Vt
r=j; Q[F$6m%o
do{ 2:S
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); xqzdXL}
SortUtil.swap(data,l,r); 93N:?B9
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while(l SortUtil.swap(data,l,r); j.rJfbE|X
SortUtil.swap(data,l,j); ?G!DYUK
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if((l-i)>THRESHOLD){ =:=uV0jX\
stack[++top]=i; m]U`7!
stack[++top]=l-1; <yrl_vl{
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if((j-l)>THRESHOLD){ -i?-Xj#%
stack[++top]=l+1; 3+jqf@ fO
stack[++top]=j; :u53zX[v
} MY}B)`yx=
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} 13P8Zmco
//new InsertSort().sort(data); h=~TgTv
insertSort(data); }%9A+w}o
} ebS>_jD
/** <Cw)S8t
* @param data beYaQz/@W
*/ {aWTT&-N
private void insertSort(int[] data) { @ zE>n
int temp; Ytnk^/Z1L
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); !7lS=D(?
} Z;QbqMj
} /r Hd9^Y
} Xo>P?^c4?
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} j9YI6X"
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