归并排序: kq\)MQ"/X
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package org.rut.util.algorithm.support; 3_JCU05H}
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import org.rut.util.algorithm.SortUtil; S9HwIH\m
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/** MX>[^}n
* @author treeroot 6TP7b|
* @since 2006-2-2 $ d?.2Kg
* @version 1.0 ]v+31vdf:O
*/ c8Z wr]DF
public class MergeSort implements SortUtil.Sort{ gGfoO[B
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/* (non-Javadoc) [qsEUc+Z.'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (8_\^jJ
*/ :qC'$dO!
public void sort(int[] data) { RK w$- 7O
int[] temp=new int[data.length]; boG_f@dv(
mergeSort(data,temp,0,data.length-1); 6(PM'@i
} E*i#?u
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private void mergeSort(int[] data,int[] temp,int l,int r){ .k,YlFvj
int mid=(l+r)/2; @k&qb!Qah
if(l==r) return ; A 7[:5$
mergeSort(data,temp,l,mid); .F+@B\A<
mergeSort(data,temp,mid+1,r); U*.0XNKp{
for(int i=l;i<=r;i++){ Sna4wkbS
temp=data; ;#Q%j%J
} Jmx Ko+-
int i1=l; 6;b~Ht
int i2=mid+1; eYx Kp!f
for(int cur=l;cur<=r;cur++){ _V`DWR
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if(i1==mid+1) y(K"
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data[cur]=temp[i2++]; ](|\whI
else if(i2>r) ID/F
data[cur]=temp[i1++]; HV<Lf
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else if(temp[i1] data[cur]=temp[i1++]; 1'?4m0W1
else R:B^
data[cur]=temp[i2++]; qe5feky
} V^;jJ']
} s=CK~+,/
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} %D * OO{
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改进后的归并排序: gCyW Vp
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package org.rut.util.algorithm.support; tJN<PCG6"
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import org.rut.util.algorithm.SortUtil; u{L!n$D7
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/** 0Lb4'25.
* @author treeroot Jec'`,Y
* @since 2006-2-2 kwsp9 0)
* @version 1.0 08*v~(T
*/ n'emNRa
public class ImprovedMergeSort implements SortUtil.Sort {
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private static final int THRESHOLD = 10; f7}*X|_Y
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/* yq$,,#XDD=
* (non-Javadoc) o6p98Dpg
* Q$fmD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P~ &$l2
*/ +]Y,q
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public void sort(int[] data) { 8,uB8C9
int[] temp=new int[data.length]; Si~vDQ7"
mergeSort(data,temp,0,data.length-1); ]~3U
} 0Zg%+)iy@
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private void mergeSort(int[] data, int[] temp, int l, int r) { %'T #pz
int i, j, k; ,GgAsj: K
int mid = (l + r) / 2; \nP>:5E1
if (l == r) D$x_o!JT
return; (IPY^>h
if ((mid - l) >= THRESHOLD) PsZ
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mergeSort(data, temp, l, mid); |n] d34E
else FJd]D[h
insertSort(data, l, mid - l + 1); qcT'nZ:
if ((r - mid) > THRESHOLD) ,#8e_3Z$
mergeSort(data, temp, mid + 1, r); iya"ky~H
else d \35a4l
insertSort(data, mid + 1, r - mid); GDuMY\1
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for (i = l; i <= mid; i++) { fYW6b[lI
temp = data; %D[0nt|X
} 5>TK^1
:
for (j = 1; j <= r - mid; j++) { \!ej<T+JR>
temp[r - j + 1] = data[j + mid]; nak Yn
} wT{nu[=GH*
int a = temp[l]; 1w&!H]%{
int b = temp[r]; b?'yAXk
for (i = l, j = r, k = l; k <= r; k++) { q?ix$nKOv
if (a < b) { vz!s~cAt
data[k] = temp[i++]; h3;bxq!q
a = temp; RG4 sQ0
} else { /7YF mI/0
data[k] = temp[j--]; YSe.t_K2C
b = temp[j]; jt.3P
} >orK';r<
} ]i)j3WDz]
} H_QsNf
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/** @n": w2^B
* @param data "T- `$'9
* @param l X<*U.=r)
* @param i Alxx[l\<J
*/ eD#hpl
private void insertSort(int[] data, int start, int len) { 2TA*m{\Hr
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); (!zy{;g|
} NW&b&o
} \(vY%DL1:
} v 7x:dcV
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}