归并排序: ~?l |
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package org.rut.util.algorithm.support; A@`}c,G
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import org.rut.util.algorithm.SortUtil; kj Jn2c:y
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/** 11 NQR[
* @author treeroot 9p]QM)M
* @since 2006-2-2 HVRZ[Y<^
* @version 1.0 s9mx
*/ 7 W5@TWM
public class MergeSort implements SortUtil.Sort{ jVi) Efy
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/* (non-Javadoc) IYv`IS"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) x5pdS:
*/ _T60;ZI+^
public void sort(int[] data) { 'B|JAi?
int[] temp=new int[data.length]; 6%' QjwM_
mergeSort(data,temp,0,data.length-1); /l3V3B7
} 7^avpf)>
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private void mergeSort(int[] data,int[] temp,int l,int r){ J4hL_iCQ
int mid=(l+r)/2; fuW\bo3
if(l==r) return ; 3<Lx&p~%T
mergeSort(data,temp,l,mid); 6bg
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mergeSort(data,temp,mid+1,r); y
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for(int i=l;i<=r;i++){ RbB.q p
temp=data; _;"il%l=1
} Lj({[H7D!
int i1=l; PI {bmZ
int i2=mid+1; }{Pp]*I<A
for(int cur=l;cur<=r;cur++){ ./Xz}<($8
if(i1==mid+1) ROI7eU
data[cur]=temp[i2++]; 1C+13LE$U
else if(i2>r) }J}-//[A
data[cur]=temp[i1++]; 2DA]i5
else if(temp[i1] data[cur]=temp[i1++]; g _9C*
else v&\Q8!r_
data[cur]=temp[i2++]; w7L{_aom
} b!t0w{^w
} kdiM5l70
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} ic:zsuEm
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改进后的归并排序: lf|FWqqV
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package org.rut.util.algorithm.support; 'ms-*c&
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import org.rut.util.algorithm.SortUtil; .^`{1%
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/** 7sCG^&Y
* @author treeroot WCZjXDiwJ
* @since 2006-2-2 :U|1 xgB
* @version 1.0 B`)BZ,#p
*/ e+7"/icK
public class ImprovedMergeSort implements SortUtil.Sort { (TtkFo'!U
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private static final int THRESHOLD = 10; 0D.Mke )
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/* tAd%#:K
* (non-Javadoc) ,L2ZinU:
* l\H=m3Bg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d0!5j
*/ >b}o~F^J
public void sort(int[] data) { 8Al{+gx@?
int[] temp=new int[data.length]; v4TQX<0s
mergeSort(data,temp,0,data.length-1); ktXM|#
} :LQYo'@yB
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private void mergeSort(int[] data, int[] temp, int l, int r) { Vr)S{k-Q
int i, j, k; ^oz3F]4,g
int mid = (l + r) / 2; KAJi
if (l == r) 2QcOR4_V
return; &J]K3w1p
if ((mid - l) >= THRESHOLD) bSlF=jT[S
mergeSort(data, temp, l, mid); y-b%T|p9
else 1s&zMWC
insertSort(data, l, mid - l + 1); z|J_b"u4
if ((r - mid) > THRESHOLD) WDYeOtc
mergeSort(data, temp, mid + 1, r); yWc$>ne[L
else eb{nWP
insertSort(data, mid + 1, r - mid); DCO\c9
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for (i = l; i <= mid; i++) { oSKXt}sh
temp = data; xj)F55e?
} F{e@W([
for (j = 1; j <= r - mid; j++) { 8NJqV+jn)t
temp[r - j + 1] = data[j + mid]; oCv.Ln1;Z
} t>RY7C;PuS
int a = temp[l]; m])y.T
int b = temp[r]; iq8<ov
for (i = l, j = r, k = l; k <= r; k++) { ;4\2.*s
if (a < b) { ub0.J#j@
data[k] = temp[i++]; Z clQ
a = temp; <$$yw=ef
} else { %\#8{g
data[k] = temp[j--]; _.Nbt(mz
b = temp[j]; y14;%aQN
} 6Pnjmw.HV
} 1-uxC^u?|#
} m9WDT
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/** s c,Hq\$&
* @param data ;`4&Rm9n?
* @param l
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* @param i r,3DTBe
*/ ?3,:-"(@p
private void insertSort(int[] data, int start, int len) { qr^3R&z!}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ZQsJL\x[UK
} 1=c\Rr9]
} ZU4nc3__
} f}ji?p
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}