归并排序: `?H]h"{7Q
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package org.rut.util.algorithm.support; rw[ph[\X
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import org.rut.util.algorithm.SortUtil; b#c:u2
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/** Yu/ID!`Z
* @author treeroot Ep_HcX`
* @since 2006-2-2 OG~gFZr)6
* @version 1.0
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*/ YpHg&|Fr
public class MergeSort implements SortUtil.Sort{ @)+AaC#-
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/* (non-Javadoc) 7O2/z:$f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8LJ8
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*/ ,]C;sN%~}
public void sort(int[] data) { ,oe <
int[] temp=new int[data.length]; J-:.FKf\5l
mergeSort(data,temp,0,data.length-1); T wB}l
} ;<Sd~M4f
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private void mergeSort(int[] data,int[] temp,int l,int r){ ~hH REI&
int mid=(l+r)/2; ;1W6G=m
if(l==r) return ; <V'@ks%
mergeSort(data,temp,l,mid); %Qgw7p4
mergeSort(data,temp,mid+1,r); l9~e".
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for(int i=l;i<=r;i++){ RU{twL.B
temp=data; ? V1*cVD6i
} yu {d! {6
int i1=l; t,Lrfv])
int i2=mid+1; udH7}K v
for(int cur=l;cur<=r;cur++){ ]]![EHi(\
if(i1==mid+1) TprTWod2]t
data[cur]=temp[i2++]; LrfVh-}|:Y
else if(i2>r) 1nM
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data[cur]=temp[i1++]; <{p4V|:
else if(temp[i1] data[cur]=temp[i1++]; 4KAZ ':
else &AMl:@p9
data[cur]=temp[i2++]; mUC)gA/
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改进后的归并排序: S7 2+d%$
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package org.rut.util.algorithm.support; 4B;=kL_f
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import org.rut.util.algorithm.SortUtil; S}3fr^{.
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/** ,,.QfUj/&
* @author treeroot 6-
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* @since 2006-2-2 ZoqZap6e
* @version 1.0 Kn{4;Xk\
*/ 3NqB
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public class ImprovedMergeSort implements SortUtil.Sort { c]-<vkpV
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private static final int THRESHOLD = 10; o[4}h:> dq
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/* c]<5zyl"j1
* (non-Javadoc) 0o4XUW
* k'Hs}z eNn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) s)t@ol
*/ M?49TOQA
public void sort(int[] data) { *R,5h2;
int[] temp=new int[data.length]; q q`4<0 I>
mergeSort(data,temp,0,data.length-1); nPtuTySG
} bs&43Ae
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private void mergeSort(int[] data, int[] temp, int l, int r) { dDMJ'
int i, j, k; @{e}4s?7od
int mid = (l + r) / 2; ]q[D>6_
if (l == r) i"FtcP^
return; ~/U1xk%
if ((mid - l) >= THRESHOLD) [aLI
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mergeSort(data, temp, l, mid); @bLy,Xr&
else B@))8.h]
insertSort(data, l, mid - l + 1); t+
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if ((r - mid) > THRESHOLD) I{&[[7H
mergeSort(data, temp, mid + 1, r); iVr J Q
else v~C
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insertSort(data, mid + 1, r - mid); :4w ?#
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for (i = l; i <= mid; i++) { Hio0HL-
temp = data; E=Bf1/c\
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for (j = 1; j <= r - mid; j++) { B mb0cFQ
temp[r - j + 1] = data[j + mid]; V &T~zh1
} MJ)RvNF
int a = temp[l]; D)P ._?
int b = temp[r]; 3M`M
for (i = l, j = r, k = l; k <= r; k++) { v/plpNVp>
if (a < b) { >6-`}G+|
data[k] = temp[i++]; hfB%`x#akQ
a = temp; }v{LRRi
} else { $wa{~'
data[k] = temp[j--]; E&w7GZNt
b = temp[j]; nFCC St$
} ^DLfY-F+j
} 6|=f$a
} 2[yd> (`
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/** 2tO,dx
* @param data Rp7mh]kZ
* @param l MN>b7O \.?
* @param i 9=tIz
*/ d-ko
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private void insertSort(int[] data, int start, int len) { G*MUO#_iuh
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 7A7?GDW
} **CR}
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} >'$Mp <
} Y@iS_lR
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}