归并排序: XGMiW0j0B
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package org.rut.util.algorithm.support; }#E[vRf
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import org.rut.util.algorithm.SortUtil; 6Kb1~jY
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/** -B\HI*u
* @author treeroot ^<-+@v*
* @since 2006-2-2 .y,0[i V
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* @version 1.0 IyPnp&_
*/ ',4iFuY
public class MergeSort implements SortUtil.Sort{ a+PzI x2
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/* (non-Javadoc) Y7[jqb1D
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P_#bow
*/ .q 3/_*
public void sort(int[] data) { $"&{aa
int[] temp=new int[data.length]; BIWWMg
mergeSort(data,temp,0,data.length-1); r{%qf;
} -8rjgB~."/
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private void mergeSort(int[] data,int[] temp,int l,int r){ &q|K!5[k
int mid=(l+r)/2; D+7Rz_=
if(l==r) return ; W1FI mlXS
mergeSort(data,temp,l,mid); =+?7''{>
mergeSort(data,temp,mid+1,r); H&}pkrH~
for(int i=l;i<=r;i++){ N<KS(@v
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temp=data; 1q1jZqno
} Vr1<^Ib
int i1=l; VD]zz
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int i2=mid+1; a,#j =
for(int cur=l;cur<=r;cur++){ Wh2tNyS
if(i1==mid+1) '1)$'
data[cur]=temp[i2++]; nSAdCJ;4
else if(i2>r) B\:%ufd
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data[cur]=temp[i1++]; ~B(4qK1G
else if(temp[i1] data[cur]=temp[i1++]; ~Ti'FhN
else TSWM
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data[cur]=temp[i2++]; 7y@Pa&^8
} }HePZ{PLM
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改进后的归并排序: Ev(>z-{F
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package org.rut.util.algorithm.support; ]Y8<`;8/
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import org.rut.util.algorithm.SortUtil; 6Yxh9*N~]
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/** K_ ~"}
* @author treeroot !pdb'*,n
* @since 2006-2-2
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* @version 1.0 sAD}#Zw$
*/ I4q9|'-yx
public class ImprovedMergeSort implements SortUtil.Sort { G&V/Gj8
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private static final int THRESHOLD = 10; 6WJ)by
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/* D"?fn<2
* (non-Javadoc) V<uR>TD(
* DOJ N2{IP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9!}8UALD
*/ ;^%4Q"
public void sort(int[] data) { $$5aUI:$~$
int[] temp=new int[data.length]; h*$y[}hDuv
mergeSort(data,temp,0,data.length-1); Ix=}+K/
} (HE9V]
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private void mergeSort(int[] data, int[] temp, int l, int r) { jQ
int i, j, k; ft KTnK.
int mid = (l + r) / 2; sN2p76KN
if (l == r) &NK,VB;
return; S4Ww5G?.
if ((mid - l) >= THRESHOLD) &*G#H~\
mergeSort(data, temp, l, mid); >kp?vK;'B
else \GZM&Zd
insertSort(data, l, mid - l + 1); Ksj -zR;
if ((r - mid) > THRESHOLD) z'\_jaj^
mergeSort(data, temp, mid + 1, r); Slher0.Y
else \BZhf?9U
insertSort(data, mid + 1, r - mid); S(8$S])0
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for (i = l; i <= mid; i++) { kDN:ep{/
temp = data; ,>-< (Qi
} g/+C@_&m
for (j = 1; j <= r - mid; j++) { 4^~(Mh- Mw
temp[r - j + 1] = data[j + mid]; OFv%B/O
} TQ*1L:X7M&
int a = temp[l]; ^_u kLzP9
int b = temp[r]; 48qV>Gwf
for (i = l, j = r, k = l; k <= r; k++) { &c:Ad%
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if (a < b) { #( jw!d&
data[k] = temp[i++]; ,5,!es@`b
a = temp; u\{ g(li-I
} else { =L:4i\4
data[k] = temp[j--]; 2h1C9n%j9
b = temp[j]; !&/{E
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} S.m{eur!,E
} ,J>5:ht(6
} WDPb!-VT
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/** |>htvDL
* @param data LBsluT
* @param l >>o dZL
* @param i \cUNsB5
*/ ]0)|7TV*
private void insertSort(int[] data, int start, int len) { O8u j`G 9
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); -}=%/|\FG
} ,:H\E|XeBw
} FUOI3
} b6F4>@gjg
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}