归并排序: R16"lG
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package org.rut.util.algorithm.support; ^IM;D)X&:
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import org.rut.util.algorithm.SortUtil; \Jv6Igu
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/** 4oOe
* @author treeroot 58MBG&a%
* @since 2006-2-2 YKUs>tQ!
* @version 1.0 ]0dp^%
*/ Rm *"SG
public class MergeSort implements SortUtil.Sort{ `h
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/* (non-Javadoc) +Mv0X%(N
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `^afbW
*/ Yb x4 Up@
public void sort(int[] data) { !H,R$3~
int[] temp=new int[data.length]; $X-,6*
mergeSort(data,temp,0,data.length-1); Fu m1w
} ^ yu^Du
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private void mergeSort(int[] data,int[] temp,int l,int r){
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int mid=(l+r)/2; \aT._'=M+
if(l==r) return ; <H E'5b
mergeSort(data,temp,l,mid); Jo
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mergeSort(data,temp,mid+1,r); K#";!
for(int i=l;i<=r;i++){ Ef$xum{
temp=data; 8N8B${X
} }
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int i1=l; z/rN+ ,
int i2=mid+1; #!y|cP~;I
for(int cur=l;cur<=r;cur++){ P67r+P,
if(i1==mid+1) !Nl"y'B|
data[cur]=temp[i2++]; v?h#Ym3e<
else if(i2>r) &2#x(v
data[cur]=temp[i1++]; K22W=B)Ln
else if(temp[i1] data[cur]=temp[i1++]; )kgy L,9
else ~&4,w9b)j
data[cur]=temp[i2++]; it>FG9hVo
} mKnkHGM
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改进后的归并排序: F K={%
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil;
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/** w},k~5U^s
* @author treeroot 0V srAV0
* @since 2006-2-2 l!q i:H<=1
* @version 1.0 "W:'cIw
*/ $o1Gxz
public class ImprovedMergeSort implements SortUtil.Sort { 4 "wuqr|o
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private static final int THRESHOLD = 10; "PJ@Q9n__
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/* XRj<2U5
* (non-Javadoc) lgA9p
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* "vjz $.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }e9:2
*/ )+mbR_@,O6
public void sort(int[] data) { 5oWR}qqFK
int[] temp=new int[data.length]; -jFt4Q7}8
mergeSort(data,temp,0,data.length-1); 7=mU["raz`
} |3\
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private void mergeSort(int[] data, int[] temp, int l, int r) { HK5\i@G+<
int i, j, k; P*R`3Y,
int mid = (l + r) / 2; \\x``*
if (l == r) +~02j1Jx
return; 01#a
if ((mid - l) >= THRESHOLD) =?T'@C
mergeSort(data, temp, l, mid); @;d(>_n
else aLuxCobV
insertSort(data, l, mid - l + 1); aeE9dV~
if ((r - mid) > THRESHOLD) T3)/?f?|
mergeSort(data, temp, mid + 1, r); ^^)D!I"cA,
else A^
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insertSort(data, mid + 1, r - mid); `2d ,=.X
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for (i = l; i <= mid; i++) { %,-vmqr
temp = data; 0j4bu}@
} -5d8j<,
for (j = 1; j <= r - mid; j++) { d^WVWk K
temp[r - j + 1] = data[j + mid]; zn>*^h0B
} Ry[VEn>C1
int a = temp[l]; x@Z?DS$)
int b = temp[r]; =f{V<i~q
for (i = l, j = r, k = l; k <= r; k++) { SAc}5.
if (a < b) { m_Z%[@L
data[k] = temp[i++]; XrtB&h|C
a = temp; }N*6xr*X+
} else { i@Q)`>4
data[k] = temp[j--]; 4wMKl6mL
b = temp[j]; S#_i<u$$
} }O5c.3
} z9YC9m)jK
} )1Os+0az
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/** &T}~h^/t
* @param data avykg(
* @param l ft4J.oT
* @param i =?0o5|u]
*/ l)HF4#Bs
private void insertSort(int[] data, int start, int len) { .P9ALJP(b
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); y7ijT='8
} m(XcPb
} C B=H1+
} r2qxi'
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}