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快速排序: jaO#><f
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package org.rut.util.algorithm.support; \e:FmG
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import org.rut.util.algorithm.SortUtil; _"!{7e`Z
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/** :*P___S=
* @author treeroot VIz{}_~'s
* @since 2006-2-2 y>7VxX0xi
* @version 1.0 <Xs@ \
*/ ?%dCU~ z
public class QuickSort implements SortUtil.Sort{ bpF@}#fT
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/* (non-Javadoc) eW"x%|/Q7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U.pr} hq
*/ 4-M6C 5#.
public void sort(int[] data) { W}R=
quickSort(data,0,data.length-1); +wz`_i)!
} [Yx-l;78
private void quickSort(int[] data,int i,int j){ /R(U>pZ
int pivotIndex=(i+j)/2; 8g#
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//swap v[,v{5b
SortUtil.swap(data,pivotIndex,j); >^T,U0T])
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int k=partition(data,i-1,j,data[j]); n$hqNsM
SortUtil.swap(data,k,j); HV*:<2P%D
if((k-i)>1) quickSort(data,i,k-1); vN0L(B
if((j-k)>1) quickSort(data,k+1,j); a(x.{}uG,
}uvKE|umj
} U|
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/** 0K$WSGB?6j
* @param data UYcyk
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* @param i dWW-tHv#
* @param j PK-}Ldj
* @return )-Mn"1ia
*/ do=x9k@Q
private int partition(int[] data, int l, int r,int pivot) { UPVO~hB;
do{ '#McY'.D T
while(data[++l] while((r!=0)&&data[--r]>pivot); iO?gF
SortUtil.swap(data,l,r); C NzSBm
} cy&
while(l SortUtil.swap(data,l,r); (}*\ {
return l; F;?TR[4!k
} (EOec5qXU
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} ^Kw&=u
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改进后的快速排序: u,Q_WR-wJ
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package org.rut.util.algorithm.support; pu2 wEQ
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import org.rut.util.algorithm.SortUtil; u-%r~ }
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/** =e-a&Ep-z
* @author treeroot Ersr\ZB
* @since 2006-2-2 (sV]UGrZ
* @version 1.0 j#LV7@H.e?
*/ D y`W5_xSz
public class ImprovedQuickSort implements SortUtil.Sort { B7Ki@)
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private static int MAX_STACK_SIZE=4096; 1*! c
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private static int THRESHOLD=10; dr,B\.|jC
/* (non-Javadoc) D% v:PYf
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) FhY{;-W(T
*/ ]Efh(Gb]
public void sort(int[] data) { uS:
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int[] stack=new int[MAX_STACK_SIZE]; ?;:9
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int top=-1; 7GBZA=J
int pivot; d5w_[=9U
int pivotIndex,l,r; DqurHQ z)m
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stack[++top]=0; .^[fG59
stack[++top]=data.length-1; Jo7fxWO_g
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while(top>0){ 2_oK5*j
int j=stack[top--]; Zzw}sZ?8
int i=stack[top--]; 5(iSOsb
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pivotIndex=(i+j)/2; 36kc4=
pivot=data[pivotIndex]; QoW(tM
6o[0sM_];
SortUtil.swap(data,pivotIndex,j); xE G+%Uk{
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//partition ;1{iF2jZ:
l=i-1; %Lh-aP{[e
r=j; wE,=%?"
do{ I<D&,LFH*w
while(data[++l] while((r!=0)&&(data[--r]>pivot)); vpeq:h
SortUtil.swap(data,l,r); vKU]80T
} dp"<KcP_
while(l SortUtil.swap(data,l,r); ]97Xu_
SortUtil.swap(data,l,j); }"%!(rx
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if((l-i)>THRESHOLD){ <_BqpZ^`
stack[++top]=i; Kf:2%_DB
stack[++top]=l-1; W\I$`gyC/
} Ur_S
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if((j-l)>THRESHOLD){ jsk:fh0~M
stack[++top]=l+1; ]6a/0rg:t
stack[++top]=j; ^G|w8t+^
} X;s3y{ku
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} nu4Pc
//new InsertSort().sort(data); otWo^CE$
insertSort(data); a^RZsR
} U=haXx4N
/** cwH,l$
* @param data ,X9hl J
*/ ;eS;AHZ
private void insertSort(int[] data) { g2[K<
int temp; g)=V#Bglv
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); &q," !:L]
} X)FL[RO%q
} 5S&aI{;9<
} 4/*]`
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