归并排序: .@fA_8
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package org.rut.util.algorithm.support; a0hBF4+6
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import org.rut.util.algorithm.SortUtil; ~AjPa}@ f
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/** fY^CIb$Y
* @author treeroot M(L6PyEa!Y
* @since 2006-2-2 LxIGPC~
* @version 1.0
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*/ (s&:D`e
public class MergeSort implements SortUtil.Sort{ PR5N:Bw
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/* (non-Javadoc) H.ZF~Yuw
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) inh:b .,B
*/ 0GxJja
public void sort(int[] data) { ;N#}3lpLqg
int[] temp=new int[data.length]; \dJhDR
mergeSort(data,temp,0,data.length-1); T; tY7;<
} N&
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private void mergeSort(int[] data,int[] temp,int l,int r){ :pM8Q1:B
int mid=(l+r)/2; JXL?.{'A
if(l==r) return ; HnArj_E
mergeSort(data,temp,l,mid); \(Oc3+n6
mergeSort(data,temp,mid+1,r); 7f+@6jqD\)
for(int i=l;i<=r;i++){ tTBDb
temp=data; dV[G-p
} WP*}X7IS
int i1=l; tx7 zG.,
int i2=mid+1; 2*Qi4%s#
for(int cur=l;cur<=r;cur++){ /69yR
if(i1==mid+1) RWv4/=}(G
data[cur]=temp[i2++]; cW>=/
else if(i2>r) 6YU,>KP
data[cur]=temp[i1++]; #I?Z,;DI=
else if(temp[i1] data[cur]=temp[i1++]; QL8C!&=
else EF!J#N2
data[cur]=temp[i2++]; sJx_X8
} fD@d.8nXd
} {[#)Q.2
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} \t)va:y
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改进后的归并排序: 3}FZg
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package org.rut.util.algorithm.support; WYb}SI(E
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import org.rut.util.algorithm.SortUtil; ?|kbIZP(
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/** V<#KFm$>C
* @author treeroot Hmr f\(x
* @since 2006-2-2 lS9S7`
* @version 1.0 @=l6zd@
*/ 4_5f4%S
public class ImprovedMergeSort implements SortUtil.Sort { HSysME1X:/
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private static final int THRESHOLD = 10; w^Y/J4 I0
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/* EtzSaB*|
* (non-Javadoc) ya1
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* OY}FtGy
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xjr4')h
*/ Hh Q0>
public void sort(int[] data) { O
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int[] temp=new int[data.length]; pWKE`x^
mergeSort(data,temp,0,data.length-1); z(A[xN@/W<
} A0Nx?
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private void mergeSort(int[] data, int[] temp, int l, int r) { \1G'{#Q
int i, j, k; u ,3B[
int mid = (l + r) / 2; W9]z]6
if (l == r) AC1RP`c
return; K7`6G[RMb
if ((mid - l) >= THRESHOLD) hUi@T}aA|
mergeSort(data, temp, l, mid); uKAI->"
else ;iuwIdo6c
insertSort(data, l, mid - l + 1); tgKr*8t{
if ((r - mid) > THRESHOLD) D%]S>g5k
mergeSort(data, temp, mid + 1, r); 'Z~ZSu
else U4=l`{5on
insertSort(data, mid + 1, r - mid); `{:Nt#7
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for (i = l; i <= mid; i++) { 5h/,*p6Nje
temp = data; Op-z"inw
} )9"^ D
for (j = 1; j <= r - mid; j++) { ^'E^*R
temp[r - j + 1] = data[j + mid]; FShjUl>mV
} I;NW!"pU
int a = temp[l]; |:5O|m '
int b = temp[r]; #epbc K
for (i = l, j = r, k = l; k <= r; k++) { IMwV9rF
if (a < b) { ~BuzI9~7P
data[k] = temp[i++]; w{aGH/LN
a = temp; 3h:~NL
} else { Cd)g8<
data[k] = temp[j--]; 0 YFXF
b = temp[j]; 3[u-
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} lo>9 \ Po
} -$<oY88
} ]6B9\C.2-_
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/** c`;oV-f
* @param data ]0* aE
* @param l IOZw[9](+
* @param i q6F1Rt
*/ < 8'
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private void insertSort(int[] data, int start, int len) { r1< 'l
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); buX(mj:&
} aC[G_ACwc
} cxs@ph&Wk
} $B-/>Rz
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}