归并排序: ,9Si3vn
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package org.rut.util.algorithm.support; 1Y'NG<d_
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import org.rut.util.algorithm.SortUtil; a&RH_L jM
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/** MUn(ZnQy|
* @author treeroot |ya.c\}q
* @since 2006-2-2 ohna1a^
* @version 1.0 qs Wy
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*/ 75^AO>gt
public class MergeSort implements SortUtil.Sort{ #+#^cqjZ
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/* (non-Javadoc) 0TWd.+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B,A,5SuMk
*/ fLS].b]1N
public void sort(int[] data) { L@s_)?x0
int[] temp=new int[data.length]; QtQbr*q@%
mergeSort(data,temp,0,data.length-1); =}zSj64
} OXJ'-EZH
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private void mergeSort(int[] data,int[] temp,int l,int r){ /]oQqZHv
int mid=(l+r)/2; e2^TQv2(=e
if(l==r) return ; LyH1tF
mergeSort(data,temp,l,mid); !|Wf
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mergeSort(data,temp,mid+1,r); ZeLed[J^xJ
for(int i=l;i<=r;i++){ ,49Z/P
temp=data; bEm9hFvd
} 8PR\a!"
int i1=l; 7@
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int i2=mid+1; lHAWZyO
for(int cur=l;cur<=r;cur++){ U0U y
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if(i1==mid+1) EKus0"|
data[cur]=temp[i2++]; ^B:;uyG]M
else if(i2>r) 7-gT:
data[cur]=temp[i1++]; s }Ql9
else if(temp[i1] data[cur]=temp[i1++]; =;Dj[<mJ45
else ly:2XvV3~
data[cur]=temp[i2++];
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} e|N~tUVrrN
} R$X~d8o>%
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改进后的归并排序: *:"@
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package org.rut.util.algorithm.support; />6ECT
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import org.rut.util.algorithm.SortUtil; u}b%-:-
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/** 9dmoB_G
* @author treeroot 1YK(oRSDn
* @since 2006-2-2 $,P:B%]
* @version 1.0 J$5Vjh'aM
*/ =f!clhO
public class ImprovedMergeSort implements SortUtil.Sort { 2VzYP~Jg
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private static final int THRESHOLD = 10; ,l Y4WO
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/* 2RQ-L
* (non-Javadoc) PV:J>!]
* F$bV}>-1k
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7[PEiAI
*/ C;j&Vbf
public void sort(int[] data) { stUUez>
int[] temp=new int[data.length]; &d0sv5&s
mergeSort(data,temp,0,data.length-1); $,yAOaa
} v&bG`\ !
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private void mergeSort(int[] data, int[] temp, int l, int r) { p6Z|)1O]
int i, j, k; /'VbV8%
int mid = (l + r) / 2; 0( *L)s,5
if (l == r) ;tSAQ
return; j+@3.^vK
if ((mid - l) >= THRESHOLD) AJm$(3?/D
mergeSort(data, temp, l, mid); ]f0OmUHR5i
else 1
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insertSort(data, l, mid - l + 1); Nte$cTjX
if ((r - mid) > THRESHOLD) G;$;$gM
mergeSort(data, temp, mid + 1, r); Qe{w)e0}`
else `XpQR=IOMb
insertSort(data, mid + 1, r - mid); 8CZ%-}-%$
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for (i = l; i <= mid; i++) { *~>p;*
temp = data; X'-Yz7J?o
} !|up"T I
for (j = 1; j <= r - mid; j++) { 7f4O~4.[i
temp[r - j + 1] = data[j + mid]; :eSsqt9]9
} &7oL2Wf
int a = temp[l]; =YTcWB
int b = temp[r]; - Z`RKR8C
for (i = l, j = r, k = l; k <= r; k++) { 3H`{
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if (a < b) { vENf3;o0
data[k] = temp[i++]; Z`u$#<ukX
a = temp; a eeor
} else { MM_:2 ^P)
data[k] = temp[j--]; +D:8r|evH
b = temp[j]; -rn6ZSD)
} 'It8h$^j
} @0 /qP<E
} tM^4K r~o,
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/** <l$ d>,
* @param data X.#)CB0c1Q
* @param l T4HJy|
* @param i t:5-Ro
*/ 50j8+xJPV
private void insertSort(int[] data, int start, int len) { yji[Yde;|
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); BqY_N8l&E
} V*{rHp{=p
} .z.4E:Iq
} 5OppK(Oi*C
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}