归并排序: zH|YVg
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package org.rut.util.algorithm.support; gpT~3c;l=
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import org.rut.util.algorithm.SortUtil; -A]-o
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/** ICdfak
* @author treeroot pTeN[Yu?
* @since 2006-2-2 kB[l6`
* @version 1.0 pYN.tD FO
*/ h4ozwVA
public class MergeSort implements SortUtil.Sort{ -XASS%
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/* (non-Javadoc) G]v BI=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) iHa:6
*/ ^iA_<@[`X[
public void sort(int[] data) { R1C}S
int[] temp=new int[data.length]; _w}l,
mergeSort(data,temp,0,data.length-1); WU$l@:Yo
} v_|k:l
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private void mergeSort(int[] data,int[] temp,int l,int r){ 1u8 k}
int mid=(l+r)/2; G22{',#r8
if(l==r) return ; 1R.|j_HYy
mergeSort(data,temp,l,mid); z!s1$5:" 0
mergeSort(data,temp,mid+1,r); ;SgPF:T>Q
for(int i=l;i<=r;i++){ t1`.M$
temp=data; 1S+lHG92I
} O\J{4EB@.
int i1=l; s3-TBhAv
int i2=mid+1; d%Ls'[Y^_0
for(int cur=l;cur<=r;cur++){ WhT5NE9t
if(i1==mid+1) #fx>{ vzH
data[cur]=temp[i2++]; k3+LP7|*
else if(i2>r) \/s0p
data[cur]=temp[i1++]; A('o&H
else if(temp[i1] data[cur]=temp[i1++]; g@zhhBtQ
else 9ls*L!Jw
data[cur]=temp[i2++]; D wfw|h
} tdsfCvF=a
} ?zuKVi?I
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} y[{}124
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改进后的归并排序: Na>w~
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package org.rut.util.algorithm.support; B ({g|}|G+
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import org.rut.util.algorithm.SortUtil; 5<XWbGW
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/** kGmz1S}2
* @author treeroot 2kcDJ{(
* @since 2006-2-2 ;e{e
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* @version 1.0 Q h{P>}
*/ !^'6&NR#K
public class ImprovedMergeSort implements SortUtil.Sort { SM8f"H28
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private static final int THRESHOLD = 10; F'-,Ksn
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/* s:K'I7_#@
* (non-Javadoc) JU#m?4g
* 'gtcy
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) cT5BBR
*/ bkuJN%
public void sort(int[] data) { ^[&,MQU{7
int[] temp=new int[data.length]; e I9#JM|2
mergeSort(data,temp,0,data.length-1); I~GHx5Dk
} l(9AwVoAR|
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private void mergeSort(int[] data, int[] temp, int l, int r) { ^z`d2it
int i, j, k; >,ABE2t5
int mid = (l + r) / 2; 99tUw'w
if (l == r) ix hF,F
return; M._;3_)%/
if ((mid - l) >= THRESHOLD) ]O>AD6P
mergeSort(data, temp, l, mid); '#C5m#v
else _T_6Yl&cf)
insertSort(data, l, mid - l + 1); 388vdF
if ((r - mid) > THRESHOLD) AJ3%Z$JJ;s
mergeSort(data, temp, mid + 1, r); ;t M
else U[? f@.&
insertSort(data, mid + 1, r - mid); dT0>\9ZNr
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for (i = l; i <= mid; i++) { F9"Xu-g
temp = data; Z~w2m6;s
} Wecxx^vtv6
for (j = 1; j <= r - mid; j++) { Vr@tSc&
temp[r - j + 1] = data[j + mid]; R^mkQb>m.
} |c>.xt~
int a = temp[l]; DheQcM
int b = temp[r]; 6RG63+G
for (i = l, j = r, k = l; k <= r; k++) { CZE!@1"<{
if (a < b) { on;>iKta9
data[k] = temp[i++]; g^}C/~b[
a = temp; W] WH4.y
} else { +eO>> ~Z
data[k] = temp[j--]; b!e0pFS;
b = temp[j]; LJ6l3)tpD
} zwU1(?]I{
} *+XiBho
} -u7NBtgUh
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/** ]j!pK4
* @param data h@z0 x4_])
* @param l .Cf!5[0E
* @param i PCHKH
*/ JVGTmS[3
private void insertSort(int[] data, int start, int len) { `8r$b/6
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); FJ^\K+;
} yh/JHo;
} UM`{V5NG#
} &6vWz6 !P
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}