归并排序: ^[.Z~>3!\q
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package org.rut.util.algorithm.support; fS]Z`U"
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import org.rut.util.algorithm.SortUtil; >9,LN;Ic
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/** 8 Y))/]R
* @author treeroot num2HtU&%
* @since 2006-2-2 vu~7Z;y(<j
* @version 1.0 >">grDX
*/ ;{1 ws
public class MergeSort implements SortUtil.Sort{ F- {hXM
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/* (non-Javadoc) gR${S|Z#u4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !X\aZ{}Q
*/ ]<k+a-Tt
public void sort(int[] data) { 6o]j@o8V
int[] temp=new int[data.length]; wPvYnhr|G-
mergeSort(data,temp,0,data.length-1); ,[[Xo;q
} LY2QKjgP
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private void mergeSort(int[] data,int[] temp,int l,int r){ 9P*p{O{_
int mid=(l+r)/2; ]3d5kf
if(l==r) return ; ok{
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mergeSort(data,temp,l,mid); kudXwj
mergeSort(data,temp,mid+1,r); i2!0bY
for(int i=l;i<=r;i++){ |N0RBa4%
temp=data; a"8H(HAlNn
} sOm&7A?
int i1=l; d5'4RYfkQ
int i2=mid+1; yJ?=HH?
for(int cur=l;cur<=r;cur++){ KMXd
if(i1==mid+1) FO)`&s"&2
data[cur]=temp[i2++]; $1n\jN
else if(i2>r) )D"2Q:
data[cur]=temp[i1++]; %t%D|cf
else if(temp[i1] data[cur]=temp[i1++]; %JuT'7VB
else 5UvqE_
data[cur]=temp[i2++]; l@g%A#
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} MS& 'Nj
} #0c;2}D
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} \vgM`32<
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改进后的归并排序: cG5u$B
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package org.rut.util.algorithm.support; w~>tpkUB
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import org.rut.util.algorithm.SortUtil; vOU9[n
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/** |b+CXEzo
* @author treeroot V(0V$&qipc
* @since 2006-2-2 $j"BHpN
* @version 1.0 v8>bR|n5
*/ {`V ^V_
public class ImprovedMergeSort implements SortUtil.Sort { newURb,-!
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private static final int THRESHOLD = 10; N]&:xd5
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/* r tH
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* (non-Javadoc) TiD|.a8S
* !_>o2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Dq`$3ZeA
*/ 4oN*J +"=+
public void sort(int[] data) { j>#ywh*A
int[] temp=new int[data.length]; 4}Yn!"jW&
mergeSort(data,temp,0,data.length-1); *V{Y.`\
} =21m|8c
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private void mergeSort(int[] data, int[] temp, int l, int r) { Gq{ );fq
int i, j, k; !wH'dsriD
int mid = (l + r) / 2; L4v26*P
if (l == r) ?4#wVzuzA
return; 63c\1]YB.
if ((mid - l) >= THRESHOLD) W('V2Z-q
mergeSort(data, temp, l, mid); Dmr3r[
else 4c@_u8
insertSort(data, l, mid - l + 1); bd)Sb?
if ((r - mid) > THRESHOLD) &+ UnPE(
mergeSort(data, temp, mid + 1, r); VUzRA"DP|
else <STE~ZmO
insertSort(data, mid + 1, r - mid); {gI% -
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for (i = l; i <= mid; i++) { 'k/:3?R
temp = data; EOo,olklC
} GB}!7W"
for (j = 1; j <= r - mid; j++) { -V=,x3Zew
temp[r - j + 1] = data[j + mid]; (= Wu5H
} afd.v$63
int a = temp[l]; Qb' Q4@.
int b = temp[r]; v;d3uunqv
for (i = l, j = r, k = l; k <= r; k++) { 7AQv4
if (a < b) { AU<A\
data[k] = temp[i++]; #Ht;5p>5
a = temp; lF~!F<^9
} else { vGchKN~_
data[k] = temp[j--]; C5~
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b = temp[j]; zA8Tp8(
} ](>YjE0
} ESni r6HoU
} ;n.SRy6
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/** xmHW,#%ui\
* @param data Dw.Pv)'$
* @param l M\r=i>(cu
* @param i M4E==
*/ Vs(D(d,
private void insertSort(int[] data, int start, int len) { rmPJid[8B~
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); n_4BNOZ~
} tD> qHR
} c!] yT0v&s
} sn8r`59C
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}