归并排序: 60,z! Vv
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package org.rut.util.algorithm.support; */c4b:s
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import org.rut.util.algorithm.SortUtil; v+Eub;m
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/** ,1/O2aQ%\0
* @author treeroot 9$[6\jMh
* @since 2006-2-2 oC
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* @version 1.0 \4Uhc3
*/ |j$r@
public class MergeSort implements SortUtil.Sort{ 9d&@;&al
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/* (non-Javadoc) ypU-/}Cf,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $B%wK`J
*/ }Q$}LR@
public void sort(int[] data) { Hb}O/G$a*
int[] temp=new int[data.length]; fF6bEJl3
mergeSort(data,temp,0,data.length-1); VyX5MVh
} C7*n<+e
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private void mergeSort(int[] data,int[] temp,int l,int r){ Z$?(~ln
int mid=(l+r)/2; {uUV(FzF6
if(l==r) return ; %,T=|5
mergeSort(data,temp,l,mid); M[ {O%!
mergeSort(data,temp,mid+1,r); YI+ clh;%9
for(int i=l;i<=r;i++){ Kb X&E0
temp=data; -t]3 gCLb
} lXtsnQOOK
int i1=l; 88Nx/:#Y*
int i2=mid+1; @)#EZQi x
for(int cur=l;cur<=r;cur++){ 5aj%<r
if(i1==mid+1) <OY (y#x
data[cur]=temp[i2++]; [|".j#ZlK
else if(i2>r) srPczVG*
data[cur]=temp[i1++]; <W]
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else if(temp[i1] data[cur]=temp[i1++]; o|:c{pwq
else n%|og^\0
data[cur]=temp[i2++]; Pi+pQFz5
} %k%%3L,
} wZ4w`|'
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} rn^cajO^
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改进后的归并排序: 9?X8H1
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package org.rut.util.algorithm.support; [)+wke9
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import org.rut.util.algorithm.SortUtil; 9xi nX-x;n
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/** E5aRTDLq
* @author treeroot 3rVfBz
* @since 2006-2-2 (E;+E\E
* @version 1.0 BP4xXdG
*/ @C-03`JWuK
public class ImprovedMergeSort implements SortUtil.Sort { s$% t2UaV
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private static final int THRESHOLD = 10; `j1oxJm
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/* \sMe2OL#z
* (non-Javadoc) *\.8*6*$!
* Y~xo=v(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) lArKfs/
*/ X [<%T}s#
public void sort(int[] data) { ho-#Xbq#g
int[] temp=new int[data.length]; /KLkrW
mergeSort(data,temp,0,data.length-1); z$gtGrU
} kmUL^vF
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private void mergeSort(int[] data, int[] temp, int l, int r) { 8`<e\g7-
int i, j, k; >.M>,m\
int mid = (l + r) / 2; X=+|(A,BdY
if (l == r) w73?E#8
return; nU4to
if ((mid - l) >= THRESHOLD) IM% ,A5u
mergeSort(data, temp, l, mid); 5U-SIG*
else 6r|=^3{
insertSort(data, l, mid - l + 1); W#)X@TlE
if ((r - mid) > THRESHOLD) 7nm'v'\u+V
mergeSort(data, temp, mid + 1, r); ,,SV@y;
else +4$][3.
insertSort(data, mid + 1, r - mid); @XJ#oxM^
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for (i = l; i <= mid; i++) { @ ]40xKF
temp = data; @9eN\b%I^H
} cYp/? \
for (j = 1; j <= r - mid; j++) { Ngj&1Ta&[
temp[r - j + 1] = data[j + mid]; yR?./M!
} M8Vc5
int a = temp[l]; h!@7'Q
int b = temp[r]; ollsB3]]
for (i = l, j = r, k = l; k <= r; k++) { T|8:_4/l
if (a < b) { @@j:z;^|
data[k] = temp[i++]; "OwK-
a = temp; |Fz ^(US
} else { [^Bjmw[7
data[k] = temp[j--]; ?&'Kw>s@
b = temp[j]; O\CnKNk,
} Y[l<fbh(}
} p}3` "L=
} ue^HhZ9
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/** N]eBmv$|
* @param data 3&>0'h
* @param l Y)@Y$_
* @param i EK=
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*/ [UXN=
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private void insertSort(int[] data, int start, int len) { NRny]!
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); xP_/5N=f
} "u]&~$
} GeDI\-
} ,]:Gn5~
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}