归并排序: B`vV[w?
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package org.rut.util.algorithm.support; gP}M\3-O
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import org.rut.util.algorithm.SortUtil; $I.'7
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/** [W2k#-%G
* @author treeroot UwLa9Dn^
* @since 2006-2-2 ;3w W)gL1
* @version 1.0 vXc<#X9
*/ N;htKcZ
public class MergeSort implements SortUtil.Sort{ i}!CY@sW
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/* (non-Javadoc) )Z62xK2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9]Y@eRI<
*/ UZyo:*yB
public void sort(int[] data) { *aSFJK
int[] temp=new int[data.length]; {AZW."?
mergeSort(data,temp,0,data.length-1); az w8BK
} 51~:t[N|
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private void mergeSort(int[] data,int[] temp,int l,int r){ de"*<+
int mid=(l+r)/2; d+_qBp
if(l==r) return ; _^KD&t%!+y
mergeSort(data,temp,l,mid); }{[F+|\>,e
mergeSort(data,temp,mid+1,r); P%1s6fjU
for(int i=l;i<=r;i++){ 5n_<)Ycj
temp=data; BUtXHD
} YcIk{_N3
int i1=l; 4u<oe_n
int i2=mid+1; nF)|oA
for(int cur=l;cur<=r;cur++){ Q@2Smtu~c
if(i1==mid+1) x{=ty*E
data[cur]=temp[i2++]; +;vfn>^!b
else if(i2>r) /V,:gLpQ
data[cur]=temp[i1++]; 8 }-"&-X
else if(temp[i1] data[cur]=temp[i1++]; 5[0n'uH
else wL:3RZB
data[cur]=temp[i2++]; 8^O|Aa$IF:
} 4h-y'&Z
} Gv<K#@9T
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} mX
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改进后的归并排序: C,Ch6Ph
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package org.rut.util.algorithm.support; *dGW=aM#C
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import org.rut.util.algorithm.SortUtil; R#oXQaBJ
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/** P!:D2zSH_
* @author treeroot =>4,/g3
* @since 2006-2-2 *C$
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* @version 1.0 5)0R:
*/ >I+O@
public class ImprovedMergeSort implements SortUtil.Sort { 3^8%/5$v
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private static final int THRESHOLD = 10; P>:"\I[
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/* @;pTQ
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* (non-Javadoc) S/8xo@vct]
* d<xBI,g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) wL~
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*/ pm^[ve
public void sort(int[] data) { &ceZu=*
int[] temp=new int[data.length]; Qd$d*mwg:
mergeSort(data,temp,0,data.length-1); h" j{B
} 1SQ&mH/
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private void mergeSort(int[] data, int[] temp, int l, int r) { z[l17+v
int i, j, k; ;+cZS=
int mid = (l + r) / 2; w
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if (l == r) 8$S$*[-a
return; _Nlx)Y R
if ((mid - l) >= THRESHOLD) TTS}, `
mergeSort(data, temp, l, mid); gwNv;g
else hV_0f_Og
insertSort(data, l, mid - l + 1); 9^XT,2Wwf
if ((r - mid) > THRESHOLD) zcDVvP
mergeSort(data, temp, mid + 1, r); EFhe``
else p,U.5bX
insertSort(data, mid + 1, r - mid); H;|^z@RB<
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for (i = l; i <= mid; i++) { O]`CSTv'_
temp = data; j$BM$q/c
} F8.Fp[_tM
for (j = 1; j <= r - mid; j++) { >AJtoJ=j
temp[r - j + 1] = data[j + mid]; 7h,SX]4Q
} IX$ $pdQ
int a = temp[l]; 't2"CPZ
int b = temp[r]; klv ]+F&[
for (i = l, j = r, k = l; k <= r; k++) { //g~1(
if (a < b) { Vc}m_T]O
data[k] = temp[i++]; CKyX Z
a = temp; `G,\=c~{A
} else { y~jTI[kS
data[k] = temp[j--]; L=?Yc*vg
b = temp[j]; ! p458~|
} qa2QS._m
} }3ty2D#/:
} #X`j#"Ov2(
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/** "4zTP!Ow
* @param data }"E?#&^
* @param l _=}Efy7
* @param i t /1KKEZM
*/ }hhDJ_I5M
private void insertSort(int[] data, int start, int len) { V\Cu|m&HI
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Sm{idky)[
} ["kk.*&
} 5l}v
}
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}