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快速排序: Ov-b:lH
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package org.rut.util.algorithm.support; 2nb:)
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import org.rut.util.algorithm.SortUtil;
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/** >vrxP8_
* @author treeroot s%iOUL2/
* @since 2006-2-2 ,U)"WLmY
* @version 1.0 Kx"<J@
*/ SxyONp.$\
public class QuickSort implements SortUtil.Sort{ w|mb4AyL{?
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/* (non-Javadoc) = 5D nR
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Cp^@zw*/
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public void sort(int[] data) { (nW67YTr
quickSort(data,0,data.length-1); PCd0 ?c
} KucV3-I
private void quickSort(int[] data,int i,int j){ VHOfaCE
int pivotIndex=(i+j)/2; c[}(OH
//swap C
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SortUtil.swap(data,pivotIndex,j); 6m .k;'
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int k=partition(data,i-1,j,data[j]); p3ISWJa!
SortUtil.swap(data,k,j); "I;C;}!
if((k-i)>1) quickSort(data,i,k-1); o01kYBD
if((j-k)>1) quickSort(data,k+1,j); >$gG/WD?KR
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} sDgXU@
/** IYWjHE+)d
* @param data >Sa*`q3J
* @param i 1\RGM<q$f
* @param j M:Er_,E
* @return n}A\2bO
*/ . .QB~
private int partition(int[] data, int l, int r,int pivot) { zeP}tzQO
do{ 9[v1h,L
while(data[++l] while((r!=0)&&data[--r]>pivot); C\_zdADUb%
SortUtil.swap(data,l,r); >}~#>Ru
} /wQL
while(l SortUtil.swap(data,l,r); H@X oqgI
return l; vgn@d,v
}
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改进后的快速排序: gw+9x<e
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package org.rut.util.algorithm.support; eRbGZYrJ
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import org.rut.util.algorithm.SortUtil; ]!:oYAm
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/** Zn:R
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* @author treeroot BE&B}LfvfO
* @since 2006-2-2 Xqp|VbDca
* @version 1.0 JXiZB
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*/ {P8[X@Lu
public class ImprovedQuickSort implements SortUtil.Sort { n<Svwa}
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private static int MAX_STACK_SIZE=4096; B}OY/J/*8
private static int THRESHOLD=10; Gx?+9CV
/* (non-Javadoc) v,NHQyk
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7Y=cn_
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*/ d
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public void sort(int[] data) { ?:^mBb)T
int[] stack=new int[MAX_STACK_SIZE]; n?#!VN3
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int top=-1; Nd:R"
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int pivot; \u`)kJ5o1
int pivotIndex,l,r; |1Dc!V'?"
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stack[++top]=0; (VvKGh
stack[++top]=data.length-1; '"pd
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while(top>0){ RhF>T&Q
int j=stack[top--]; -O:_!\uA
int i=stack[top--]; hlvt$Jwq
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pivotIndex=(i+j)/2; R~L0{`
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pivot=data[pivotIndex]; tc_f;S`k
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SortUtil.swap(data,pivotIndex,j); h*0S$p<[1
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//partition f<i7@%
l=i-1; Rg29
r=j; F9c`({6k
do{ RnVtZ#SCh
while(data[++l] while((r!=0)&&(data[--r]>pivot)); O|kKwadC
SortUtil.swap(data,l,r); "re-@Baw
} u#W5`sl
while(l SortUtil.swap(data,l,r); B UUf;Vv
SortUtil.swap(data,l,j); 0m[dP
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if((l-i)>THRESHOLD){ ydl jw
stack[++top]=i; 4kp im
stack[++top]=l-1; UbJ*'eoX
} wbbqt0un
if((j-l)>THRESHOLD){ K5 3MMH[q#
stack[++top]=l+1; qg z*'_S
stack[++top]=j; NCeaL-y7
} )G^TW'9
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} |wxGpBau
//new InsertSort().sort(data); ~KjJ\b)R
insertSort(data); ;:&?=d
} VBoMT:#
/** HCA{pR`
* @param data -ML6d&cm
*/ FD7H@L5
private void insertSort(int[] data) { }pNX@C#De
int temp; <>SdVif]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); wyc D>hc
} O[~x_xeW
} Ob +9W
} a+41|)pt
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