归并排序: FO!]P
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package org.rut.util.algorithm.support; ? i( %
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import org.rut.util.algorithm.SortUtil; G]fRk^~
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/** wS4.8iJ
* @author treeroot %K\?E98M
* @since 2006-2-2 J13>i7]L%
* @version 1.0 +)j$|x~(A
*/ >iD )eB
public class MergeSort implements SortUtil.Sort{ _acE:H
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/* (non-Javadoc) 1jy9lP=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^zt-HDBR_
*/ /h*>P:i].
public void sort(int[] data) { 5D_fXfx_|
int[] temp=new int[data.length]; T-5nB>)
mergeSort(data,temp,0,data.length-1); sYjpU
} 5$wpL(:R(
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private void mergeSort(int[] data,int[] temp,int l,int r){ v=_6XF
int mid=(l+r)/2; cgm81+[%r
if(l==r) return ; |`lzfe
mergeSort(data,temp,l,mid); IG|X!l
mergeSort(data,temp,mid+1,r); &e;=cAXG
for(int i=l;i<=r;i++){ O)ME"@r@:
temp=data; Xb{
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} }z\_;\7
int i1=l; #$c Rkw
int i2=mid+1; s<oNE)xe
for(int cur=l;cur<=r;cur++){ r :F
if(i1==mid+1) t%'Z<DmG+
data[cur]=temp[i2++]; "\}@gV#r$A
else if(i2>r) e XfZ5(na
data[cur]=temp[i1++]; 7b<je=G6PA
else if(temp[i1] data[cur]=temp[i1++]; D9FJ 1~
else Hm$=h>rY9[
data[cur]=temp[i2++]; {@tv>!WW
} B>GE9y5
} 1jc,
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} f.
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改进后的归并排序: :,J}z~I,lB
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package org.rut.util.algorithm.support; 'ow.=1N-
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import org.rut.util.algorithm.SortUtil; -5T=:2M
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/** Q8DQlqHm
* @author treeroot rMU T_^
* @since 2006-2-2 ,(;lIP
* @version 1.0 GKoK7qH\J
*/ e _/b2"{
public class ImprovedMergeSort implements SortUtil.Sort { {W]=~*w
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private static final int THRESHOLD = 10; M-;4
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/* hWKJ,r%9;
* (non-Javadoc) cIp
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* sgO'wXcoP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $dA-2e10
*/ v>Mnl
public void sort(int[] data) { (s{RnD
int[] temp=new int[data.length]; 2D:fJ~|-[
mergeSort(data,temp,0,data.length-1); [-)r5Dsdq
} _L@2_#h!
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private void mergeSort(int[] data, int[] temp, int l, int r) { ^|TG$`M(w
int i, j, k; MW PvR|Q
int mid = (l + r) / 2; A0fFv+RN3
if (l == r) A0Zt8>w
return; ND5`Q"k
if ((mid - l) >= THRESHOLD) Qu7T[<
mergeSort(data, temp, l, mid); `\m*+Bk[5
else z8[yt282
insertSort(data, l, mid - l + 1); k<cgO[m
if ((r - mid) > THRESHOLD) 6<' 21
mergeSort(data, temp, mid + 1, r); HgBGV0
else 1ylk4@`
insertSort(data, mid + 1, r - mid); "3<da* D1
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for (i = l; i <= mid; i++) { qY>{cjo
temp = data; cetvQAGXY
} o ,xxh
for (j = 1; j <= r - mid; j++) { P)uDLFp]
temp[r - j + 1] = data[j + mid]; hRq3C1mR
} NuYkz"O]
int a = temp[l]; 11,!XD*"
int b = temp[r]; ;/0 Q1-
for (i = l, j = r, k = l; k <= r; k++) { w=}uwvn NX
if (a < b) { MCT'Nw@A
data[k] = temp[i++]; Vp<seO;7o
a = temp; _ z;q9&J)
} else { W,K%c=
data[k] = temp[j--]; l9Q(xuhv
b = temp[j]; N |1>ooU[
} rLU/W<F8
} 0x9x@gF
} sO5?aB&
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/** T2D<UhP
* @param data i[ $0a4
* @param l gZEi]/8_
* @param i [lk'xzE
*/ /1 RAAa
private void insertSort(int[] data, int start, int len) { x)UwV
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); .^bft P\
} cv(PP-'\
} ;r/;m\V
} up2+s#
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}