归并排序: 0fK|}mmZA
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package org.rut.util.algorithm.support; wEc5{ b5M
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import org.rut.util.algorithm.SortUtil; cH-Zj
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/** c@B%`6kF
* @author treeroot RcM0VbR"EU
* @since 2006-2-2 vm^# aoDB
* @version 1.0 "K!BJQ
*/ .mrRv8>$
public class MergeSort implements SortUtil.Sort{ "wC5hj]
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/* (non-Javadoc) HbSx}bM_9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) K$5P_~;QL
*/ `gs,JJ6N
public void sort(int[] data) { Ru aJ9O
int[] temp=new int[data.length]; ?8}jJw2H
mergeSort(data,temp,0,data.length-1); p%
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} Qu\l$/
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private void mergeSort(int[] data,int[] temp,int l,int r){ qWRMwvN{
int mid=(l+r)/2; FOG+[v
if(l==r) return ; L [M8[~Hy
mergeSort(data,temp,l,mid); {$:13AnK
mergeSort(data,temp,mid+1,r); h#ot)m|I
for(int i=l;i<=r;i++){ E+Mdl*
temp=data; b}*bgx@<
} &Q+V I/p
int i1=l; eSBf;lr=
int i2=mid+1; s?#lhI
for(int cur=l;cur<=r;cur++){ X(z-?6N4
if(i1==mid+1) L/LNX{|
data[cur]=temp[i2++];
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else if(i2>r)
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data[cur]=temp[i1++];
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else if(temp[i1] data[cur]=temp[i1++]; 9cj-v}5j
else \^LR5S&
data[cur]=temp[i2++]; ]qHO{b4k
} deY<+!
} 2A
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改进后的归并排序: }PL
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package org.rut.util.algorithm.support; X6'&X
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import org.rut.util.algorithm.SortUtil; ]m>MB )9
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/** Y,\mrW}K
* @author treeroot BniVZCct
* @since 2006-2-2 {~h\;>
* @version 1.0 W)hby`k
*/ Sd6^%YB
public class ImprovedMergeSort implements SortUtil.Sort { [KJL%u|8/
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private static final int THRESHOLD = 10; Z5-'|h$|
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/* Lpf=VyqC
* (non-Javadoc) v72 dE
* 7Z3qaXPH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :|3C-+[
*/ c?",kzo
public void sort(int[] data) { }TvAjLIS6
int[] temp=new int[data.length]; QLG,r^
mergeSort(data,temp,0,data.length-1); QjU"|$
} }>U03aa!
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private void mergeSort(int[] data, int[] temp, int l, int r) { -h`0v
int i, j, k; .&.CbE8K[
int mid = (l + r) / 2; >E=a~ O
if (l == r) O8o18m8UH
return; &W!@3O{~.
if ((mid - l) >= THRESHOLD) a<.@+sj{
mergeSort(data, temp, l, mid); iNSJOS
else V'/%)oU\"
insertSort(data, l, mid - l + 1); ev
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if ((r - mid) > THRESHOLD) B ;$8<
mergeSort(data, temp, mid + 1, r); &,7(Wab
else m
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insertSort(data, mid + 1, r - mid); oX,M;;Yq
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for (i = l; i <= mid; i++) { {rLOAewr
temp = data; ;A!i V|
} *2;3~8Y
for (j = 1; j <= r - mid; j++) { L 3@wdC~0
temp[r - j + 1] = data[j + mid]; Njje g9 f
} S:QEHd_C
int a = temp[l]; ?K 0V#aq
int b = temp[r]; Y,~]ecI
for (i = l, j = r, k = l; k <= r; k++) { <~w#sIh
if (a < b) { Xii#Qtd.
data[k] = temp[i++]; IA`
a = temp; b@hoH)<9E
} else { /]&1 XT?
data[k] = temp[j--]; (p!AX<=z
b = temp[j]; 74#@F{ w
} Lp=B? H
} DYK|"@
} ^XVa!s,d
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/** Q-5wI$=
* @param data bmpB$@
* @param l ;7>--_?=
* @param i S(l^TF
*/ WcFZRy-erc
private void insertSort(int[] data, int start, int len) { !
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); HfPeR8I%i
} "RA$Twhj
} OQvJdjST
} n0q(EQy1U
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}