归并排序: zKLn!b#>
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package org.rut.util.algorithm.support; u]HS(B,ht
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import org.rut.util.algorithm.SortUtil; W*k`
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/** NB EpM
* @author treeroot $ye^uu;Z
* @since 2006-2-2 xXF2"+
* @version 1.0 (NX)oP
*/ ]}Pl%.
public class MergeSort implements SortUtil.Sort{ [ S5bj]D
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/* (non-Javadoc) >DL/..
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ wL;]1&Qq
public void sort(int[] data) { UL+E,=
int[] temp=new int[data.length]; Bwjg#1 E
mergeSort(data,temp,0,data.length-1); $^t<9"t
} (]2<?x*
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private void mergeSort(int[] data,int[] temp,int l,int r){ TWUUvj`.
int mid=(l+r)/2; AzZJG v]H
if(l==r) return ; Q6=MS>JW]w
mergeSort(data,temp,l,mid); Y2<dM/b/
mergeSort(data,temp,mid+1,r); a\=-D:
for(int i=l;i<=r;i++){ b\?3--q
temp=data; qgtn5]A
} A8J8u,u9
int i1=l; $,TGP+vH
int i2=mid+1; :/B:FY=
for(int cur=l;cur<=r;cur++){ {VR`;
if(i1==mid+1) ( :{"C6x
data[cur]=temp[i2++]; NS@{~;#R
else if(i2>r) sGSsUO:@j;
data[cur]=temp[i1++]; ,'~#Ch
else if(temp[i1] data[cur]=temp[i1++]; J{d(1gSZ
else UR}kB&t
data[cur]=temp[i2++]; K"L_`.&Q
} U
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} W6vf=I@f
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改进后的归并排序: \^LWCp,C"
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package org.rut.util.algorithm.support; > @+#
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import org.rut.util.algorithm.SortUtil; [B,'=,Hbs
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/** <s_=-"
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* @author treeroot ?4 qkDtm
* @since 2006-2-2 BEWro|]cM
* @version 1.0 l7z6i*R
*/ atyu/+U'}
public class ImprovedMergeSort implements SortUtil.Sort { 1Y#HcW&
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private static final int THRESHOLD = 10; e2c1pgs&+
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/* c`
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* (non-Javadoc) FI8k;4|V
* n$4|PO$X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <c+K3P'3?
*/ X8b|]Nr
public void sort(int[] data) { [SkKz>rC
int[] temp=new int[data.length]; qgx?"$ Z
mergeSort(data,temp,0,data.length-1); 0 " y%9
} >Q=Ukn;k
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private void mergeSort(int[] data, int[] temp, int l, int r) { 1}}>Un`U5,
int i, j, k; t,h{+lYU
int mid = (l + r) / 2; Cp^g'&
if (l == r) wz#A1F
return; \3aTaT?..
if ((mid - l) >= THRESHOLD) 7d;pvhnH
mergeSort(data, temp, l, mid); 'z5h3J
else \vCGU>UY
insertSort(data, l, mid - l + 1); DI,K(_@G
if ((r - mid) > THRESHOLD) XX2h(-
mergeSort(data, temp, mid + 1, r); h0Ee?=
else B_k2u
insertSort(data, mid + 1, r - mid); DK6?E\<
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for (i = l; i <= mid; i++) { *tc{vtuu~^
temp = data; %v{1#~u
} Ly7!R$X
for (j = 1; j <= r - mid; j++) { F\:(*1C
temp[r - j + 1] = data[j + mid]; ,3HcCuT
} ', {7%G9
int a = temp[l];
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int b = temp[r]; (e9fm|n!)|
for (i = l, j = r, k = l; k <= r; k++) { +?[BU<X6u
if (a < b) { f8'MP9Lv
data[k] = temp[i++]; .et ^4V3
a = temp; KzphNHd
} else { ``u:lL
data[k] = temp[j--]; Gr: 3{o`
b = temp[j]; !8R@@,_v
} }HRK?.Vj:
} nWJ:=JQ i"
} Tf x :"u
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/** zN{JJ3-
* @param data R J~%0
* @param l gg^1b77hT
* @param i !VP %v&jKm
*/ 8uch i
private void insertSort(int[] data, int start, int len) { _<zfQZai
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1);
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} 3A,rHYS
} P`jL]x
} {Dr@HP/x=s
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}