归并排序: yWN'va1+$
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package org.rut.util.algorithm.support; Z@JTZMN_
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import org.rut.util.algorithm.SortUtil; A[Ce3m
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/** b
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* @author treeroot *!NW!,R
* @since 2006-2-2 9$(N q
* @version 1.0 otdv;xI9
*/ 0ly6 |:
public class MergeSort implements SortUtil.Sort{ gpbdK?
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/* (non-Javadoc) FAGi`X<L
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &"1 _n]JO
*/ 8SiWAOQAL
public void sort(int[] data) { 5M>SrZH
int[] temp=new int[data.length]; FD8
mergeSort(data,temp,0,data.length-1); PJKxh%J
} tOj5b7'ui
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private void mergeSort(int[] data,int[] temp,int l,int r){ *xeJ4h
int mid=(l+r)/2; {j[*:l0Ui
if(l==r) return ; 1 j|XC
mergeSort(data,temp,l,mid); 4&L,QSJ V
mergeSort(data,temp,mid+1,r); *rm[\
for(int i=l;i<=r;i++){ |jWA >S
temp=data; &`"uKO]
} =(<7o_gJ
int i1=l; @71y:)W<
int i2=mid+1; >
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for(int cur=l;cur<=r;cur++){ dDYor-g>
if(i1==mid+1) sWq}/!@&
data[cur]=temp[i2++]; -|czhO)R
else if(i2>r) F9IPA%
data[cur]=temp[i1++]; $reQdN=~
else if(temp[i1] data[cur]=temp[i1++]; o}D7 $6
else Ko0T[TNkh
data[cur]=temp[i2++]; Ej@N}r>X
} 5tVg++I
} WK SWOSJ
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改进后的归并排序: ,+5!1>\
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package org.rut.util.algorithm.support; T< <N U"n
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import org.rut.util.algorithm.SortUtil; {mHxlG)
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/** h5; +5B}D
* @author treeroot gi/W3q3c6
* @since 2006-2-2
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* @version 1.0 8?o{{ay
*/ 8L))@SA+uJ
public class ImprovedMergeSort implements SortUtil.Sort { w (,x{Bg\
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private static final int THRESHOLD = 10; UXS+GAWU
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/* cPl$N5/5
* (non-Javadoc) cc3+Wx_
* wD<W'K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f./j%R@
*/ m?)F@4]
public void sort(int[] data) { ub{Yg5{3S\
int[] temp=new int[data.length]; _lOyT$DN
mergeSort(data,temp,0,data.length-1); T,4REbm^
} P9# }aw+
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private void mergeSort(int[] data, int[] temp, int l, int r) { WZ@$bf}f0
int i, j, k; ][T>052v
int mid = (l + r) / 2; ]@msjz'
if (l == r) ZN`I4Ak
return; <*4r6UFR
if ((mid - l) >= THRESHOLD) gn${@y?
mergeSort(data, temp, l, mid); @%As>X<3t
else ,xC@@>f
insertSort(data, l, mid - l + 1); =NL(L
if ((r - mid) > THRESHOLD) wIQt
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mergeSort(data, temp, mid + 1, r); M0MvOO*ad
else DM !B@
insertSort(data, mid + 1, r - mid); Y#Pg*C8>8
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for (i = l; i <= mid; i++) { ?CuwA-j
temp = data; ~,84E [VV
} 2MKB(;k
for (j = 1; j <= r - mid; j++) { dMH}%f5;1
temp[r - j + 1] = data[j + mid]; ]*AQT7PH
} !2g*=oY
int a = temp[l]; -sk!XWW+
int b = temp[r]; #Ic-?2Gn4<
for (i = l, j = r, k = l; k <= r; k++) { ~w$ ^`e!]
if (a < b) { U#n1N7P|$F
data[k] = temp[i++]; @yn1#E,
a = temp; ]A:G>K
} else { 5SHZRF(. 2
data[k] = temp[j--]; &;%LTF@I,
b = temp[j]; zAd%dbU|
} Ivc/g,
} sMWNzt
} y)+lU
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/** jL#`CD
* @param data Bjsg!^X7
* @param l \w@ "`!%
* @param i ,S=ur%
*/ Md1ePp]
private void insertSort(int[] data, int start, int len) { oei2$uu
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 8Nf%<nUv
} iXuSFman
} H}}C>p"!,
} ^/$bd4,z
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}