归并排序: pO7Zs
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package org.rut.util.algorithm.support; x/!5K|c
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import org.rut.util.algorithm.SortUtil; zFz10pH
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/** Hc^W%t~
* @author treeroot q1?&Ev^
* @since 2006-2-2 s{0aBeq
* @version 1.0 8NBT|N~N
*/ X5LBEOG
public class MergeSort implements SortUtil.Sort{ n_?tN\M
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/* (non-Javadoc) vi.w8>CE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (o5j'2:.
*/ En{`@JsM
public void sort(int[] data) { 1rKy@9
int[] temp=new int[data.length]; F+m }#p
mergeSort(data,temp,0,data.length-1); Ep9W- n?}
} "]K>j'^Zs<
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private void mergeSort(int[] data,int[] temp,int l,int r){ Dre2J<QL
int mid=(l+r)/2; z2_6??tS/c
if(l==r) return ; $5x ,6[&
mergeSort(data,temp,l,mid); eI45PMP
mergeSort(data,temp,mid+1,r); '2^7-3_1
for(int i=l;i<=r;i++){ >P6BW
temp=data; 7%f&M>/
} 0k)rc$eDF+
int i1=l; Q7Iw[=;\
int i2=mid+1; yAL[[
for(int cur=l;cur<=r;cur++){ GZI`jS"lU
if(i1==mid+1) 'k;rH!R
data[cur]=temp[i2++]; wX >*H
else if(i2>r)
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data[cur]=temp[i1++]; k:jSbbQ
else if(temp[i1] data[cur]=temp[i1++]; 4}+/F}TbJ5
else Od f[*
data[cur]=temp[i2++]; 7xRl9
}
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} v~QHMg
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改进后的归并排序: @)o^uU T
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package org.rut.util.algorithm.support; 8Nu=^[qwQM
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import org.rut.util.algorithm.SortUtil; I:K"'R^
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/** hGpv2>M
* @author treeroot y;_% W
* @since 2006-2-2 cufH?Xg<
* @version 1.0 UMAgA!s
*/ dXF^(y]l
public class ImprovedMergeSort implements SortUtil.Sort { p
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private static final int THRESHOLD = 10; 9IX/wm"
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/* 3EJt%}V$k
* (non-Javadoc) :VTTh
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* ULMu19>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J8mdoVt
*/ SkmT`*v@
public void sort(int[] data) { :POj6j/
int[] temp=new int[data.length]; `BlI@6th
mergeSort(data,temp,0,data.length-1); x)( |[
} ep)>X@t
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private void mergeSort(int[] data, int[] temp, int l, int r) { n2iJ%_zp
int i, j, k; ty8v
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int mid = (l + r) / 2; ")d`dj\o
if (l == r) d_IAs
return; &mb{.=
if ((mid - l) >= THRESHOLD) Y "/]|'p
mergeSort(data, temp, l, mid); ~ 4kc/a
else #B4%|v;`E?
insertSort(data, l, mid - l + 1); T}8Y6N<\m
if ((r - mid) > THRESHOLD) 6i1LjLB
mergeSort(data, temp, mid + 1, r); #Y$hNQQ$F
else ?Y@N`S
insertSort(data, mid + 1, r - mid); 8ji_#og
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for (i = l; i <= mid; i++) { EOCN&_Z;
temp = data; Z<vKQ4G
} Mnscb
for (j = 1; j <= r - mid; j++) { Za1QC;7
temp[r - j + 1] = data[j + mid];
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} 3f,hw5R
int a = temp[l]; 97}OL`y
int b = temp[r]; *{L)dW+:
for (i = l, j = r, k = l; k <= r; k++) { 9b9$GyI
if (a < b) { [Al&
data[k] = temp[i++]; b45-:mi!
a = temp; iv4H#rJ
} else { <i&_ooX
data[k] = temp[j--]; 4rLL[??
b = temp[j]; v_DedVhe
} YB2VcF.LU
} )v.=jup[
} MB]<Dyj,
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/** a6uJYhS~
* @param data xCc[#0R{
* @param l fTK3,s1=
* @param i #T'{ n1AI
*/ ++`0rY%
private void insertSort(int[] data, int start, int len) { =,6z4" )
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); y~U #veY
} pe1R(|H
} :g Wu9Y|{
} $xPaYf
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}