归并排序: H:1F=$0I9
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package org.rut.util.algorithm.support; ,n5 [Y)
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import org.rut.util.algorithm.SortUtil; ^dhtc%
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/** C\[g>_J
* @author treeroot i6h0_q8
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* @since 2006-2-2 uUpOa+t
* @version 1.0 `p^xdj}
*/ v".u#G'u
public class MergeSort implements SortUtil.Sort{ WgV[,(
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/* (non-Javadoc) ^yF2xJ)9-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f=MR.\
*/ /0F
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public void sort(int[] data) { %eqL)pC]
int[] temp=new int[data.length]; z?_5fte`
mergeSort(data,temp,0,data.length-1); .Wci@5:3
} kObgoMT<[
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private void mergeSort(int[] data,int[] temp,int l,int r){ ;V~~lcD&Y`
int mid=(l+r)/2; }JWk?
if(l==r) return ; &]' <M
mergeSort(data,temp,l,mid); P\|i<Ds_M
mergeSort(data,temp,mid+1,r); nr9cG/"
for(int i=l;i<=r;i++){ k{$Mlt?&-
temp=data; w~9=6|_
} {I_I$x_
int i1=l; m`ab5<%Gn
int i2=mid+1; (V~PYf%
for(int cur=l;cur<=r;cur++){ {?'c|\n Li
if(i1==mid+1) G9\@&=
data[cur]=temp[i2++]; lhV'Q]s@6
else if(i2>r) kIUb`b>B
data[cur]=temp[i1++]; .hXdXY
else if(temp[i1] data[cur]=temp[i1++]; d5B96;3
else _9zydtw
data[cur]=temp[i2++]; u%Yr&u
} qg@Wzs7c~
} TBqJ.a
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} AJH-V
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改进后的归并排序: SA$1rqU=
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package org.rut.util.algorithm.support; E
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import org.rut.util.algorithm.SortUtil; ~v<,6BS<$Z
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/** #(NkbJ5ka
* @author treeroot BK:S:
* @since 2006-2-2 _-I 0f##.
* @version 1.0 3F0:v,+;
*/ y/@.T\p
public class ImprovedMergeSort implements SortUtil.Sort { W|kKH5E&
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private static final int THRESHOLD = 10; # nh;KlI0
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/* 8.Ty
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* (non-Javadoc) 6,|)%~VUm
* A5ps|zidI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &Qdd\h#
*/ AiO29<
public void sort(int[] data) { aTy&"
int[] temp=new int[data.length]; f&ym'S
mergeSort(data,temp,0,data.length-1); !>+Na~eN
} V+l>wMeo
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private void mergeSort(int[] data, int[] temp, int l, int r) { .ZrQ{~t
int i, j, k; ^dR5fAS
int mid = (l + r) / 2; <4Jo1
if (l == r) uNYHEs6%T$
return; ^\<1Y''
if ((mid - l) >= THRESHOLD) [sY>ac
mergeSort(data, temp, l, mid); `QlChxd
else 0 .dSP$e
insertSort(data, l, mid - l + 1); |EaEdA@T
if ((r - mid) > THRESHOLD) =e,2/Ep{i
mergeSort(data, temp, mid + 1, r); 8Mq]
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else =ITMAC\
insertSort(data, mid + 1, r - mid); ~WJEH#
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for (i = l; i <= mid; i++) { %!HmtpS
temp = data; r,x;q
} *qE[Y0Cd
for (j = 1; j <= r - mid; j++) { E:&ga}h
temp[r - j + 1] = data[j + mid]; %o+VZEH3
} |vnfY;
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int a = temp[l]; <c6C+OWT,
int b = temp[r]; k]"Rg2>%
for (i = l, j = r, k = l; k <= r; k++) { \~zTc_
if (a < b) { V4!RUqK
data[k] = temp[i++]; fD<3Tl8U0
a = temp; }IGr%C(3%
} else { RCq_FY
data[k] = temp[j--]; #$Z|)i]w
b = temp[j]; 94F9f^ L
} j%KLp4J/e
} SA|f1R2uS
} -<i&`*zG
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/** ?'h<yxu]u0
* @param data qf9.S)H1Z
* @param l #]|9aVrr
* @param i mMw&{7b:
*/ U&/Jh^Yy
private void insertSort(int[] data, int start, int len) { 9\i,3:Qc
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Tc`LY/%Od
} CV4r31w
} vpUS(ztvs
} /9WR>NUAO
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}