归并排序: bqLv81 V
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package org.rut.util.algorithm.support; ^Cak/5^K
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import org.rut.util.algorithm.SortUtil; d3 N %V.w
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/** rAQ^:q
* @author treeroot ''WX
* @since 2006-2-2 NuXU2w~
* @version 1.0 oYqC"g&4Z
*/ "\V:W%23W{
public class MergeSort implements SortUtil.Sort{ `[ne<F?e
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/* (non-Javadoc) ~MQN&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G-:DMjvN
*/ S63L>p|ml
public void sort(int[] data) { 9GQTe1[t4
int[] temp=new int[data.length]; GvVuF S>y
mergeSort(data,temp,0,data.length-1); YE-kdzff
} Dk7"#q@kx
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private void mergeSort(int[] data,int[] temp,int l,int r){ |0Zj/1<$
int mid=(l+r)/2; +~[19'GH
if(l==r) return ; z?i82B[Tm
mergeSort(data,temp,l,mid); L' )(Zn1
mergeSort(data,temp,mid+1,r); <LLSUk/
for(int i=l;i<=r;i++){ }u|0
temp=data; fmSA.z
} \tQi7yj4
int i1=l; Ep'C FNbtW
int i2=mid+1; @D7cv"
for(int cur=l;cur<=r;cur++){ y24 0 +;a
if(i1==mid+1) fh 2Pn!h+
data[cur]=temp[i2++]; w}2yi#E[
else if(i2>r) dvxH:,
data[cur]=temp[i1++]; 7"S|GEs:
else if(temp[i1] data[cur]=temp[i1++]; kPxrI=
else {fS/ZG"5<t
data[cur]=temp[i2++]; Dbtw>:=
} QVFa<>8/md
} JEAqSZak#
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} {!EbGIh
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改进后的归并排序: P|6m%y
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package org.rut.util.algorithm.support; )^r4|WYyt
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import org.rut.util.algorithm.SortUtil; <Z0Tz6/j,
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/** V8N<%/A=
* @author treeroot ]#J]f
* @since 2006-2-2 ao,LP,_
* @version 1.0 */qv}
*/ +6TKk~0e^
public class ImprovedMergeSort implements SortUtil.Sort { GEvif4
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private static final int THRESHOLD = 10; VWNmqeP
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/* LAvAjvRc
* (non-Javadoc) yC _X@o-n
* ciXAyT cG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) HAU8H'h
*/ 9:esj{X
public void sort(int[] data) { u4Xrvfb,
int[] temp=new int[data.length]; ZBnf?fU
mergeSort(data,temp,0,data.length-1); [qb#>P2G3
} \@80Z5?n
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private void mergeSort(int[] data, int[] temp, int l, int r) { K3@UoR
int i, j, k; lw Kr$X4
int mid = (l + r) / 2; ME7JU|@Z
if (l == r) D)mqe-%1
return; 1 8&^k|
if ((mid - l) >= THRESHOLD) S]9xqiJW
mergeSort(data, temp, l, mid); 7zNyH(.
else @ 8SYV}0H
insertSort(data, l, mid - l + 1); x2nNkd0h
if ((r - mid) > THRESHOLD) 1ITa6vjS
mergeSort(data, temp, mid + 1, r); AFY;;_Xks
else au#IA
insertSort(data, mid + 1, r - mid); M9i u#6P
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for (i = l; i <= mid; i++) {
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temp = data; S[%86(,*gP
} ~+|p.(I
for (j = 1; j <= r - mid; j++) { ,iHl;3bu
temp[r - j + 1] = data[j + mid]; MbJV)*Q
} /]vg_&)=
int a = temp[l]; 19lx;^b
int b = temp[r]; Dui<$jl0b
for (i = l, j = r, k = l; k <= r; k++) { }t-{,0
if (a < b) { 7.]xcJmt>'
data[k] = temp[i++]; D!y
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a = temp; ]~|zY5i!
} else { `zTVup&
data[k] = temp[j--]; /njN*rhx&Z
b = temp[j]; /FQumqbnt
} gsZCWT
} 2B*9]AHny
} JNsK
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/** 0lW}l9}'-
* @param data udw5A*Ls
* @param l H 7R1GaJ
* @param i vZk+NS<
*/ Dn9Ta}miTO
private void insertSort(int[] data, int start, int len) { T3Tk:r
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 0chBw~@*s
} d*!,McBn
} 7?F0~[eGG
} W>h[aVTO
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}