归并排序: %QCh#v=ks
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package org.rut.util.algorithm.support; 3Un
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import org.rut.util.algorithm.SortUtil; d[9c6C:<q
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/**
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* @author treeroot _~ZNX+4
* @since 2006-2-2 rXPq'k'h#-
* @version 1.0 =UE/GTbl
*/ }OZp[V
public class MergeSort implements SortUtil.Sort{ 9~2}hXm;
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/* (non-Javadoc) .&:y+Oww~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |2z?8lx
*/ mtu/kd'(
public void sort(int[] data) { >~8;H x].d
int[] temp=new int[data.length]; OOA%NKV
mergeSort(data,temp,0,data.length-1); 7p}J]!Z
} [DpGL/Y.
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private void mergeSort(int[] data,int[] temp,int l,int r){ kclClB:PS
int mid=(l+r)/2; W ZdEfY{
if(l==r) return ; #; CC"
mergeSort(data,temp,l,mid); ;jS2bc:8a
mergeSort(data,temp,mid+1,r); FR&4i" +
for(int i=l;i<=r;i++){ >77N5>]e
temp=data; xOnbYU
} |WqEJ*$,
int i1=l; %{WZ
int i2=mid+1; ^ ]02)cK
for(int cur=l;cur<=r;cur++){ +[Cdd{2
if(i1==mid+1) v]SHude{
data[cur]=temp[i2++]; K<TVp;N
else if(i2>r) eM
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data[cur]=temp[i1++]; q1}HsTnBH
else if(temp[i1] data[cur]=temp[i1++]; g`I`q3EF)
else yV[9 (
data[cur]=temp[i2++];
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} 7N9~nEU
} D!<[\G
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改进后的归并排序: /I&Hq7SW`
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package org.rut.util.algorithm.support; ,WSK
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import org.rut.util.algorithm.SortUtil; &~gqEl6RF
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/**
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* @author treeroot golr,+LSo
* @since 2006-2-2 {@, } M
* @version 1.0 Ww-%s9N<
*/ #2l6'gWE0
public class ImprovedMergeSort implements SortUtil.Sort { XHU&ix{Od
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private static final int THRESHOLD = 10; _yk}
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/* HEdOo~/~
* (non-Javadoc) hp=TWt~
* m} /L MY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 65X31vU
*/ v|uY\Z
public void sort(int[] data) { &S[tI$
int[] temp=new int[data.length]; FdwT
mergeSort(data,temp,0,data.length-1); J%}9"Q5
} o8B_;4uB
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private void mergeSort(int[] data, int[] temp, int l, int r) { banie{ e
int i, j, k; lCT N
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int mid = (l + r) / 2; H^_]' ~.
if (l == r) 5dOA^P@`,M
return; %. ^8&4$+
if ((mid - l) >= THRESHOLD) =qPk'n9i8
mergeSort(data, temp, l, mid); Q -;ltJ
else {T|sU\| Q
insertSort(data, l, mid - l + 1); ZfalB
if ((r - mid) > THRESHOLD) pgT XyAP{
mergeSort(data, temp, mid + 1, r); U7O]g'BP
else GtI]6t
insertSort(data, mid + 1, r - mid); j$r .&,m
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for (i = l; i <= mid; i++) { ER,,K._?B
temp = data; eBiP\
} l*]9
for (j = 1; j <= r - mid; j++) { s!S,;H
temp[r - j + 1] = data[j + mid]; $T* ##kyE9
} t95hI DtD
int a = temp[l]; clfi)-^{K
int b = temp[r]; *4}lV8
for (i = l, j = r, k = l; k <= r; k++) { S~^0
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if (a < b) { k#"Pv"
data[k] = temp[i++]; Ij;=
a = temp; V"":_`1VW
} else { /E>z8J$
data[k] = temp[j--]; .gUceXWH3
b = temp[j]; e
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} x" 21 Jh
} A6w/X`([O
} ~:7AHK2
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/** %-"?
* @param data <}'hkEh{d=
* @param l tV2SX7N
* @param i o?A/
*/ .UNh\R?r
private void insertSort(int[] data, int start, int len) { t6
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); tm\ <w H
} wqDRFZ1*P
} g*8LdH6mq
} EFeG[bxM
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}