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快速排序: 5$T>noD
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package org.rut.util.algorithm.support; SgOn:xg;3L
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import org.rut.util.algorithm.SortUtil; +6xEz67A<
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/** U1>VKP;5Nn
* @author treeroot ![v@+9
* @since 2006-2-2 :V%XEN)
* @version 1.0 _TRO2p0
*/ oM@X)6P_
public class QuickSort implements SortUtil.Sort{ !lf:x
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/* (non-Javadoc) u,d@oF(=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -n-rKN.T
*/ H nRd
public void sort(int[] data) { ml|[xM8
quickSort(data,0,data.length-1); ;plzJ6>
} 0ang^v;q
private void quickSort(int[] data,int i,int j){ Q&Rj)1!
int pivotIndex=(i+j)/2; 31n5n
//swap =Of!1TR(
SortUtil.swap(data,pivotIndex,j); O1.a=O
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int k=partition(data,i-1,j,data[j]); O MEPF2:
SortUtil.swap(data,k,j); $Q[>v!!X
if((k-i)>1) quickSort(data,i,k-1); 7kBULeBn|
if((j-k)>1) quickSort(data,k+1,j); ys5b34JN
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} oJF@O:A
/** !!=%ty
* @param data C} #:<Jx
* @param i }ST9&wi~
* @param j V}#2pP
* @return o9!DK
*/ pcM'j#;
private int partition(int[] data, int l, int r,int pivot) { ndkV(#wQS
do{ !O=J8;oLk
while(data[++l] while((r!=0)&&data[--r]>pivot); %bnDxCj"
SortUtil.swap(data,l,r); xGQ958@
} Z6}B}5@y
while(l SortUtil.swap(data,l,r); tQy@d_a=y
return l; x}G["ZU}v]
} =OIxG}*
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} a.a5qwG
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改进后的快速排序: GM6Y`iU
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package org.rut.util.algorithm.support; u-zl- ?Ne
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import org.rut.util.algorithm.SortUtil; C3af>L@}
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/** nT0FonK>
* @author treeroot (m[]A&u
* @since 2006-2-2 n&x#_B-
* @version 1.0 Be{7Rj v
*/ ~_P,z?
public class ImprovedQuickSort implements SortUtil.Sort { *yqEl
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private static int MAX_STACK_SIZE=4096; sgDlT=c'
private static int THRESHOLD=10; 3u7^*$S
/* (non-Javadoc) M0<gea\ =
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) e2Sudd=' G
*/ %|[+\py$Q
public void sort(int[] data) { tL1"Dt>
int[] stack=new int[MAX_STACK_SIZE]; s@C@q(i6
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int top=-1; 6R1){,8
int pivot; zqg4@"
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int pivotIndex,l,r; 2{zFO3i<3
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stack[++top]=0; 4,kT4_&,
stack[++top]=data.length-1; 9u/ "bj
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while(top>0){ N<$U:!Z
int j=stack[top--]; RS G\3(
int i=stack[top--]; Hd6g0
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pivotIndex=(i+j)/2; U]lXw+&
pivot=data[pivotIndex]; `#hdb=3
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SortUtil.swap(data,pivotIndex,j); *upl*zFf0
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//partition MzRURH,
l=i-1; CRvUD.D
r=j; GcQO&oq|
do{ r#
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); ]%m0PU#
SortUtil.swap(data,l,r); OwrzD~
} QD%~A0
while(l SortUtil.swap(data,l,r); G<,@|6"w
SortUtil.swap(data,l,j); !.mMO_4}
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if((l-i)>THRESHOLD){ > bWsUG9
stack[++top]=i; gT*0WgB
stack[++top]=l-1; ?y!0QAIXK
} 09`5<9/
if((j-l)>THRESHOLD){ ;=1]h&S
stack[++top]=l+1; x]lv:m\)jT
stack[++top]=j; EO$_]0yI;_
} /|Za[
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} @ 'rk[S}A
//new InsertSort().sort(data); j8nG
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insertSort(data); x(h(a#,r
} 8SK}#44Xz
/** q05_5
* @param data ,T?8??bZ
*/ a(s}Ec${Z
private void insertSort(int[] data) { ;|e {J$
int temp; iPX6r4-
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 6W."hPP
} ;LNFPo
} Gd1%6}<~
} *_}|EuY
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} " &'Jw
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