归并排序: -ebyW#
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package org.rut.util.algorithm.support; EUPc+D3
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import org.rut.util.algorithm.SortUtil; 1B{u4w7S4e
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/** PMj!T \B|
* @author treeroot $U^ Ms!'L
* @since 2006-2-2 V1,4M _Z
* @version 1.0 xiC.M6/
*/ u3 4.
public class MergeSort implements SortUtil.Sort{ ){tTB
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/* (non-Javadoc) IV`+B<3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )\izL]=!t
*/ eN TKX
public void sort(int[] data) { {I$zmVG
int[] temp=new int[data.length]; ,G$<J0R1
mergeSort(data,temp,0,data.length-1); %x^ U3"7
} DnB :~&Dw
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private void mergeSort(int[] data,int[] temp,int l,int r){ 2;SiH]HNS
int mid=(l+r)/2; 0n?^I>j
if(l==r) return ; +'g~3A-G
mergeSort(data,temp,l,mid); -0*z"a9<p8
mergeSort(data,temp,mid+1,r); DL '{
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for(int i=l;i<=r;i++){ 7*Gg#XQ>(
temp=data; hus9Zv4
} Hq <!&
int i1=l; l8DZ2cw]
int i2=mid+1; Bv}i#D
for(int cur=l;cur<=r;cur++){ }SW>ysw'm
if(i1==mid+1) [-=y*lx%g
data[cur]=temp[i2++]; Jj+Hj[(@
else if(i2>r) u>03l(X6f
data[cur]=temp[i1++]; =kW7|c5Z
else if(temp[i1] data[cur]=temp[i1++]; 5q}7#{A
else 2J6(TrQ
data[cur]=temp[i2++]; s%l^zA(
} 6l(HD([_p
} 0ol*!@?
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} io$fL_R=
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改进后的归并排序: b;G#MjQp'
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package org.rut.util.algorithm.support; Gl>*e|}
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import org.rut.util.algorithm.SortUtil; &UX:KW`=
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/** gCI{g.[I!
* @author treeroot h}GzQry1
* @since 2006-2-2 Up1e4mNL
* @version 1.0 /V>yF&p
*/ `+T"^{
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public class ImprovedMergeSort implements SortUtil.Sort { IKeO&]k
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private static final int THRESHOLD = 10; 6"c(5#H
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/* P?`a{sl.
* (non-Javadoc) 'iEu1! t\0
* 7MwS[N%#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qZh}gu*>
*/ PCiwQ4~
public void sort(int[] data) { 4Mv] z^
int[] temp=new int[data.length]; hyC]{E
mergeSort(data,temp,0,data.length-1); rIAbr5CG
} ks(BS k4
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private void mergeSort(int[] data, int[] temp, int l, int r) { vqJq=\ .m
int i, j, k; ~|8-Mo1ce
int mid = (l + r) / 2; .arWbTR)~U
if (l == r) sK|+&BC
return; &^K,"a{
if ((mid - l) >= THRESHOLD) t`"pn<
mergeSort(data, temp, l, mid); y9Q.TL>=[
else te#Wv9x
insertSort(data, l, mid - l + 1); 0{.[#!CSk
if ((r - mid) > THRESHOLD) t|}}#Z!I[f
mergeSort(data, temp, mid + 1, r); pn
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else /9@VnM
insertSort(data, mid + 1, r - mid); @A8@j%CK1
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for (i = l; i <= mid; i++) { 9 EV. ![
temp = data; mW 'sdb
} '0jn|9l58
for (j = 1; j <= r - mid; j++) { /NFm6AA]
temp[r - j + 1] = data[j + mid]; !,JV<(7k
} HV8=b"D"
int a = temp[l]; AP/#?
int b = temp[r]; ,^&amWey
for (i = l, j = r, k = l; k <= r; k++) { ->a|
if (a < b) { Ox&]{
data[k] = temp[i++]; qPgny/(
a = temp; {*K7P> &
} else { *w23(f
data[k] = temp[j--]; Nu7lPEM
b = temp[j]; qW|_|%{U+
} !4(QeV-=
} %@Nu{?I
} <4%vl+qW
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/** Q?{^8?7
* @param data o6)U\z
* @param l >AUzsQ
* @param i %<^j=K= 0
*/ A\)~y{9bQ
private void insertSort(int[] data, int start, int len) { BKd?%V8:Q
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +W}6o3x~
} V5bB$tL}3
} LHd9q^D
} *w[0uQL5Z
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}