归并排序: Bc*FH>E
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package org.rut.util.algorithm.support; II'"Nkxd
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import org.rut.util.algorithm.SortUtil; rk-GQ#SKU
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/** dJjkH6%}
* @author treeroot Rz#q68
* @since 2006-2-2 /os,s[w
* @version 1.0 G`Df'Yy
*/ ~+)>D7
public class MergeSort implements SortUtil.Sort{ 2oo/KndU
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/* (non-Javadoc) x^79s_h5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^m/7TwD
*/ CUN1.i<pk8
public void sort(int[] data) { cSTF$62E
int[] temp=new int[data.length]; p/U{*i]t
mergeSort(data,temp,0,data.length-1); !$hi:3{U,
} = inp>L
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private void mergeSort(int[] data,int[] temp,int l,int r){ X`fb\}~R(
int mid=(l+r)/2; 2e9.U/9
if(l==r) return ; SJ2l6
mergeSort(data,temp,l,mid); |->CI
mergeSort(data,temp,mid+1,r); wJZuJ(
for(int i=l;i<=r;i++){ I.[Lv7U-
temp=data; L|L;<
} mxE<
int i1=l; Xp.$FJ1)
int i2=mid+1; K3iQ/j~a q
for(int cur=l;cur<=r;cur++){ v5\5:b{/
if(i1==mid+1) p ,.6sk
data[cur]=temp[i2++]; y_'6bpb
else if(i2>r) M@z_tR'3\
data[cur]=temp[i1++]; \U3v5|Q
else if(temp[i1] data[cur]=temp[i1++]; $^_6,uBM[
else ?t5<S]'r$
data[cur]=temp[i2++]; u].7+{
} iB|htH'T
} D94bq_2}
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} *M)M!jTv
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改进后的归并排序: .1}1e;f-
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package org.rut.util.algorithm.support; 2M*i'K;;)P
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import org.rut.util.algorithm.SortUtil; %fnG v\uI
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}
/** ):[}NDmC
* @author treeroot :..WL;gC
* @since 2006-2-2 i),bAU!+m
* @version 1.0 }i{qRx"4
*/ qX*xQA|ak,
public class ImprovedMergeSort implements SortUtil.Sort { =P%&]5ts
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private static final int THRESHOLD = 10; z)(W
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/* 8ok=&Gq4
* (non-Javadoc) M!kSt1
* ~8yh,U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) damG*-7Svx
*/ r^a:s]
public void sort(int[] data) { *`rfD*
int[] temp=new int[data.length]; xr{Ym99E$
mergeSort(data,temp,0,data.length-1); 7nPcm;Er
} %ioVNbrR7
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private void mergeSort(int[] data, int[] temp, int l, int r) { >[Wjzg
int i, j, k; .9J}Z^FD
int mid = (l + r) / 2; TZ+ p6M8G
if (l == r) |iI
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return; +ZwoA_k{
if ((mid - l) >= THRESHOLD) Ix6\5}.c 9
mergeSort(data, temp, l, mid); <gFa@at
else p_g`f9q6D
insertSort(data, l, mid - l + 1); Q#G xo
if ((r - mid) > THRESHOLD) ^~.AV]t|
mergeSort(data, temp, mid + 1, r); tsJR:~
else /IG{j}
insertSort(data, mid + 1, r - mid); *!ng)3#
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for (i = l; i <= mid; i++) { 3i7EF.
temp = data; L2,2Sn*4i
} e`s1z|h
for (j = 1; j <= r - mid; j++) { IJ&Lk=2E]
temp[r - j + 1] = data[j + mid]; L FkDb}
} @<{%r
int a = temp[l]; ZX` \so,&,
int b = temp[r]; Gk{ 'U
for (i = l, j = r, k = l; k <= r; k++) { xy]O8>b
if (a < b) { 0-S.G38{
data[k] = temp[i++]; gDVsi
a = temp; `VKFA<T
} else { Zs
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data[k] = temp[j--]; {KNaJ/:>W
b = temp[j]; ["<Xh0_
} -n&&d8G^s
} $C;i}q#
} j*<J&/luYZ
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/** |E7J5ha
* @param data pOXI*0_g.
* @param l x[)-h/&Fh
* @param i Qdq;C,}Ai.
*/ .Qx5,)@9
private void insertSort(int[] data, int start, int len) { x<gmDy*
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); P|<V0
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} bE/|&8
} #QoWneZ
} VGc*aQYa
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}