归并排序: OM*N) *
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package org.rut.util.algorithm.support; TK<~(Dk
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import org.rut.util.algorithm.SortUtil; 3
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/** D$
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* @author treeroot cobq+Iyu
* @since 2006-2-2 #80DM
* @version 1.0 ?sWPx!tU
*/ r+-KrO'
public class MergeSort implements SortUtil.Sort{ xWWfts1t
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/* (non-Javadoc) h~)oiT2v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B- =*"H?q
*/ xwhH_[
public void sort(int[] data) { 2qLRcA=R
int[] temp=new int[data.length]; ) E.KB6
mergeSort(data,temp,0,data.length-1); /~)vma1<
} rs2G{a
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private void mergeSort(int[] data,int[] temp,int l,int r){ -e_IDE
int mid=(l+r)/2; _IBIx\F
if(l==r) return ; i,=greA]"
mergeSort(data,temp,l,mid); x a#0y
mergeSort(data,temp,mid+1,r); o6,$;-?F_
for(int i=l;i<=r;i++){ jE|Ju:}&
temp=data; 7K>FCT
} &;S.1tg
int i1=l; t-*oVX3D
int i2=mid+1; c-.t8X,5(~
for(int cur=l;cur<=r;cur++){ VRurn>y0
if(i1==mid+1) R`q*a_
data[cur]=temp[i2++]; mk.:V64 >;
else if(i2>r) ??0C"8:[
data[cur]=temp[i1++]; vY0C(jK
else if(temp[i1] data[cur]=temp[i1++]; mJe;BU"y]
else Rs,\{#
data[cur]=temp[i2++]; 25]Mi2_
} G{
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} dmI,+hHtL
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改进后的归并排序: 6<jh0=$
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package org.rut.util.algorithm.support; RO?5WJpPj
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import org.rut.util.algorithm.SortUtil; roT$dL
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/** ]4wyuP,up
* @author treeroot G&$+8r
* @since 2006-2-2 ]o`qI#{R~R
* @version 1.0 tn!z^W
*/ n:d]Z2b
public class ImprovedMergeSort implements SortUtil.Sort { HEH Tj,T
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private static final int THRESHOLD = 10; u&Ts'j
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/* .|`JS?L[
* (non-Javadoc) vn<z\wVbf
* g]?&qF}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) m`CcU`s
*/ 4UD<g+|
public void sort(int[] data) { O Z<iP
int[] temp=new int[data.length]; }z:g}".4
mergeSort(data,temp,0,data.length-1); )\#w=P
} C9>tj=yEY
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private void mergeSort(int[] data, int[] temp, int l, int r) { -3`S;Dmn
int i, j, k; ?Iy$'am]L
int mid = (l + r) / 2; _ #]uk&5a
if (l == r) Kcv7C{-/
return; V)#se"GV
if ((mid - l) >= THRESHOLD) lj0"2@z3"E
mergeSort(data, temp, l, mid); ;/?M&rX
else 2>BWu
insertSort(data, l, mid - l + 1); )7@f{E#w
if ((r - mid) > THRESHOLD) Lt>"R! "x
mergeSort(data, temp, mid + 1, r); d\&{Ev9v
else o}H7;v8H
insertSort(data, mid + 1, r - mid); )jkX&7x
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for (i = l; i <= mid; i++) { #G2~#\
temp = data; (#x<qi,T
} .w=( G
for (j = 1; j <= r - mid; j++) { Y/cnj n
temp[r - j + 1] = data[j + mid]; }pOL[$L
} W FVx7
int a = temp[l]; vW,dJ[N6jm
int b = temp[r]; wz^Q,Od
for (i = l, j = r, k = l; k <= r; k++) { NFq&a i
if (a < b) { .y'iF>QQ\
data[k] = temp[i++]; 6\>S%S2:
a = temp; P__JN\{9
} else { 8q9HQ4dsL
data[k] = temp[j--]; Pf&\2_H3s9
b = temp[j]; {"|P
} OI0#@_L&
} 2z9\p%MX
} _K"|}bM
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/** V|GH4DT=
* @param data I^erMQn[ z
* @param l _~V7m
* @param i d 7vD
*/ faQ}J%a
private void insertSort(int[] data, int start, int len) { qgREkb0
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); XFpII45
} )yvI {
} c'M#va
} #x-@ >{1k&
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}