归并排序: 8l'W[6
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package org.rut.util.algorithm.support; VVcli*
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import org.rut.util.algorithm.SortUtil; HD3WsIim*
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/** ~NLthZ(O
* @author treeroot ouO9%)zv
* @since 2006-2-2 &PMfAo^
* @version 1.0 0/1=2E^,
*/ %gj7KF
public class MergeSort implements SortUtil.Sort{ RJKi98xwJ
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/* (non-Javadoc) /qMiv7m~Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kU#k#4X4g
*/ 6:AEg
public void sort(int[] data) {
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int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); cc>b#&s
}
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private void mergeSort(int[] data,int[] temp,int l,int r){ 9E Y`j,{4
int mid=(l+r)/2; 3177 R>0
if(l==r) return ; j-VwY/X
mergeSort(data,temp,l,mid); apt$e$g
mergeSort(data,temp,mid+1,r); :X:s'I4J
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for(int i=l;i<=r;i++){ Bsha)<
temp=data; @/:7G.
} /t! 5||G
int i1=l; /^v!B`A@
int i2=mid+1; unKl5A[h
for(int cur=l;cur<=r;cur++){ {:3:GdM6
if(i1==mid+1) %3AE2"
data[cur]=temp[i2++]; Z>3m-:-e
else if(i2>r)
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data[cur]=temp[i1++]; ?\(qA+iP0
else if(temp[i1] data[cur]=temp[i1++]; 0*+EYnu+
else ,k*%=TF7N
data[cur]=temp[i2++]; k_uI&,
} *$`N5;7'`
} KN"u PW
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} 9%53_nx?
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改进后的归并排序: q+2A>:|
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package org.rut.util.algorithm.support; `&'{R<cL
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import org.rut.util.algorithm.SortUtil; m )rVzL
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/** NHe)$%a=H
* @author treeroot vVIND
* @since 2006-2-2 J*Ie# :J]
* @version 1.0 Ryh 0r
*/ (:O6sTx-hE
public class ImprovedMergeSort implements SortUtil.Sort { z] -m<#1
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private static final int THRESHOLD = 10; "6U@e0ht
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/* gK@`0/k{
* (non-Javadoc) !3\$XK]5ZT
* M d8(P23hS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +\;Ro18?
*/ W7gY$\1<&
public void sort(int[] data) { 4:^MSgra
int[] temp=new int[data.length]; pLCS\AUTsv
mergeSort(data,temp,0,data.length-1); uB3VCO.;_
} ZJc{P5a1J
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private void mergeSort(int[] data, int[] temp, int l, int r) { m#i4_F=^b
int i, j, k; xx|D#Z}G
int mid = (l + r) / 2; |yz
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if (l == r) -iY-rzW
return; `#wEa'v6
if ((mid - l) >= THRESHOLD) q @O
mergeSort(data, temp, l, mid); i*$~uuY
else jT< I`K*
insertSort(data, l, mid - l + 1); ?1c7wEk
if ((r - mid) > THRESHOLD) x
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mergeSort(data, temp, mid + 1, r); 43-Bx`6\
else Bg[yn<)
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insertSort(data, mid + 1, r - mid); $Dx*[.M3>
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for (i = l; i <= mid; i++) { zwRF-{s
temp = data; 8 hhMuh
} &BNlMF
for (j = 1; j <= r - mid; j++) { sD2,!/'
temp[r - j + 1] = data[j + mid]; 7R
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} NZ&ZK@h}.
int a = temp[l]; UKV<Ye|
int b = temp[r]; x?lRObHK
for (i = l, j = r, k = l; k <= r; k++) { `LLmdm 6i
if (a < b) { _|cSXZ|
data[k] = temp[i++]; TQ:5@1aT
a = temp; k;`1Ia
} else { 85)C7tJ-g
data[k] = temp[j--]; F$jy~W_
b = temp[j]; &|}QdbW
} ^#mWV
} 2boyBz}=S
} }9W[7V?
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/** Y`{62J8oy
* @param data l&qyLL2
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* @param l JZ![:$:
* @param i upk+L^
*/ FN<>L0
private void insertSort(int[] data, int start, int len) { /W-ges
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); S[yrGX8lu
} l2YClK
} @mv
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} kksffzG
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}