归并排序: mi97$Cr2
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package org.rut.util.algorithm.support; {'d?vm!r
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import org.rut.util.algorithm.SortUtil; W4>8
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/** P?TFX.p7
* @author treeroot "me Jn/
* @since 2006-2-2 GueqpEd2
* @version 1.0 ,qvz:a
*/ KY|Q#i|pM
public class MergeSort implements SortUtil.Sort{ O^:Rm=,$
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/* (non-Javadoc) _v2FXm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) K bwWrf>
*/ $fnFi|-
public void sort(int[] data) { R
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int[] temp=new int[data.length]; BT#'<!7!
mergeSort(data,temp,0,data.length-1); xTAC&OCk^[
} 7sLs+|<"
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private void mergeSort(int[] data,int[] temp,int l,int r){ j/^0q90QO
int mid=(l+r)/2; p(Qm\g<
if(l==r) return ; )}u.b-Nt.
mergeSort(data,temp,l,mid); +(|T\%$DT
mergeSort(data,temp,mid+1,r); '{OZ[$E
for(int i=l;i<=r;i++){ {mkYW-4Se
temp=data; kTC6fNj[
} SrHRpxy
int i1=l; ?J<4IvL/
int i2=mid+1; eU{=x$o6S
for(int cur=l;cur<=r;cur++){ Mw+]*
if(i1==mid+1) WgxlQXi-B
data[cur]=temp[i2++]; IS'=%qhC`
else if(i2>r) #;^.&2Lt
data[cur]=temp[i1++]; PeE'#&wn
else if(temp[i1] data[cur]=temp[i1++]; ~Dkje
else \".3x
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data[cur]=temp[i2++]; a_x|PbD
} *y N,e.t
} 7 v`Y*D
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} 'MG)noN5
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改进后的归并排序: k#&y
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package org.rut.util.algorithm.support; L"('gc!W
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import org.rut.util.algorithm.SortUtil; |5![k<o#
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/** vx-u+/\
* @author treeroot KUuwScb\
* @since 2006-2-2 k87B+0QEL
* @version 1.0 a(BC(^1!
*/ S)Ld^0w
public class ImprovedMergeSort implements SortUtil.Sort { \h
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private static final int THRESHOLD = 10; l"ih+%S
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/* 0BVMLRB
* (non-Javadoc) WJJ!NoP
* !_V*VD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +o_`k!
*/ ZC0F:=/K
public void sort(int[] data) { x$M[/ID0
int[] temp=new int[data.length]; d~[>%&
mergeSort(data,temp,0,data.length-1); =ohdL_6
} 44_n5vp,T
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private void mergeSort(int[] data, int[] temp, int l, int r) { D;:lw]
int i, j, k; 5(U.<
int mid = (l + r) / 2; \6@}HFH
if (l == r) `CHgTkv
return; GbZA3.J]yl
if ((mid - l) >= THRESHOLD) x28Bz*O
mergeSort(data, temp, l, mid); ]bS\*q0Zf(
else nC`=quM9
insertSort(data, l, mid - l + 1); 0>.'w\,87B
if ((r - mid) > THRESHOLD) )EcF[aO
mergeSort(data, temp, mid + 1, r); $'[(
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else ][_:{ N/
insertSort(data, mid + 1, r - mid); 9$d (`-&9p
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for (i = l; i <= mid; i++) { ?|8H$1
temp = data; Z"E+ TX
} 2Jj`7VH>
for (j = 1; j <= r - mid; j++) { du47la 3
temp[r - j + 1] = data[j + mid]; tpCEWdn5
} [x)BQX'
int a = temp[l]; F]YPq
int b = temp[r]; eH1Y!&`
for (i = l, j = r, k = l; k <= r; k++) { 2gFQHV
if (a < b) { 0e/~H^,SQ
data[k] = temp[i++]; uHwuw_eK`
a = temp; }*0%wP
} else { :!aFfb["
data[k] = temp[j--]; FiFZM
b = temp[j]; E>7%/TIl
} %0"o(y+zt
} RNIfw1R
} Y4b"(ZhM_
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/** ~[,E
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* @param data Ie+z"&0
* @param l {~d4;ht1Y
* @param i ^(6.P)$
*/ 4I2ppz
private void insertSort(int[] data, int start, int len) { Q0M8}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); -|ee=BV
} `d8$OC
} tU?lfU[7
} ]Q)TqwYF
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}