归并排序: TYjA:d9YH
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package org.rut.util.algorithm.support; yu&Kh4AP
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import org.rut.util.algorithm.SortUtil; o;`!kIQ
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/** /N^~U&7
* @author treeroot &1)xoZ'\
* @since 2006-2-2 #iis/6"
* @version 1.0 eZF'Ck y
*/ oEzDMImJ5
public class MergeSort implements SortUtil.Sort{ M?o{STt
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/* (non-Javadoc) [{F%LRCo-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y7zkAXhJ
*/ "D> ]ES%5
public void sort(int[] data) { E`p'L!z
int[] temp=new int[data.length]; g0#q"v55
mergeSort(data,temp,0,data.length-1); 17py).\
} 02 f9 w V
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private void mergeSort(int[] data,int[] temp,int l,int r){ +cfziQ$'
int mid=(l+r)/2; rFXSO=P?Z
if(l==r) return ; sp8[cO=
mergeSort(data,temp,l,mid); 5RA<Z.
mergeSort(data,temp,mid+1,r); b>q6:=((
for(int i=l;i<=r;i++){ t.3\/
temp=data; lL2-.!]R
} [V< 1_zqt
int i1=l; SWoEt1w
int i2=mid+1; H2\1gNL
for(int cur=l;cur<=r;cur++){ &d
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if(i1==mid+1) %F$N#YG
data[cur]=temp[i2++]; I#l;~a<9z
else if(i2>r) h=f6~5l5
data[cur]=temp[i1++]; Z>{*ISvpq
else if(temp[i1] data[cur]=temp[i1++]; q0|ZoP
else |[wyc!nY).
data[cur]=temp[i2++]; $y6rvQ
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} *98Ti|
} YeIe\3x!N
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} QV)}3pW
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改进后的归并排序: wF;B@
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package org.rut.util.algorithm.support; kbq:U8+k
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import org.rut.util.algorithm.SortUtil; jlRS:$|R0
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/** (6#M9XL
* @author treeroot n` #+L~X
* @since 2006-2-2 *K!7R2Rat
* @version 1.0 rIp'vy S\p
*/ `wV|q~
public class ImprovedMergeSort implements SortUtil.Sort { ris;Iu^v0
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private static final int THRESHOLD = 10; US]"4=Zm
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/* oYg/*k7EDX
* (non-Javadoc) 5)x6Q|-u
* )ys=+Pz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) DrV0V
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*/ t!l/` e%J
public void sort(int[] data) { .='3bQ(UZ4
int[] temp=new int[data.length]; >~>{;Wq(p+
mergeSort(data,temp,0,data.length-1); 7n<#y;wo
} As p8qHS
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private void mergeSort(int[] data, int[] temp, int l, int r) { ,?#*eJD
int i, j, k; aC}vJ93i
int mid = (l + r) / 2; q'fPNQg
if (l == r) H&u4v2
return; S]. Ft/+H
if ((mid - l) >= THRESHOLD) 1O- E],
mergeSort(data, temp, l, mid); sMN>wbHwh[
else CElPU`J,\[
insertSort(data, l, mid - l + 1); t0I>5#*WU
if ((r - mid) > THRESHOLD) 5@CpP-W#
mergeSort(data, temp, mid + 1, r); v s w7|
else O'@m4@L
insertSort(data, mid + 1, r - mid); Q;Q
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for (i = l; i <= mid; i++) { nxf{PbHk
temp = data; SAQs{M
} hq]xmM?&
for (j = 1; j <= r - mid; j++) { i)GeX:
temp[r - j + 1] = data[j + mid]; f>?^uSpWH
} giQ{Xrj
int a = temp[l]; '?z9,oW{
int b = temp[r]; KuU3DTS85Z
for (i = l, j = r, k = l; k <= r; k++) { ;!^ +N
if (a < b) { ,uKs>T^
data[k] = temp[i++]; tru;;.lj8K
a = temp; `X3Xz!
} else { .Kg|f~InO
data[k] = temp[j--]; )A"ZV[eOoQ
b = temp[j]; J&n ^y
} ]VzqQ=U%
} uT'-B7N
} ?,D>+::
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/** :P j W:]
* @param data Wk0>1 rlu
* @param l &NlS =
* @param i wBg<Q{J
*/ 9k(*?!\;
private void insertSort(int[] data, int start, int len) { XKpL4]{&q4
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); k,
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} v; je <DT
} k'6<jEbk
} }C_G0'"F
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}