归并排序: 7pGlbdS
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package org.rut.util.algorithm.support; aIm\tPbb
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import org.rut.util.algorithm.SortUtil; NDI|;
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/** 1YS{;
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* @author treeroot !J+5l&
* @since 2006-2-2 _$F I>
* @version 1.0 q'1rSK
*/ 9 s>JdAw?
public class MergeSort implements SortUtil.Sort{ #|gt(p]C
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/* (non-Javadoc) D+k5e=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) scA&:y
*/ pET5BMxGG
public void sort(int[] data) { <)"Mi}Q[)p
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); m+V'*[O{
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private void mergeSort(int[] data,int[] temp,int l,int r){ cl{;%4$9
int mid=(l+r)/2; }b~ZpUL!
if(l==r) return ; =m1B1St 2
mergeSort(data,temp,l,mid); v_oNM5w
mergeSort(data,temp,mid+1,r); \E0Uj>9+[
for(int i=l;i<=r;i++){ s K s
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temp=data; \]o#tYN\a0
} Pirc49c
int i1=l; IF@)L>-%
int i2=mid+1; zf6k%
for(int cur=l;cur<=r;cur++){ :,:r
if(i1==mid+1) ` NcWy
data[cur]=temp[i2++]; #:236^xYS
else if(i2>r) sH#UM(N
data[cur]=temp[i1++]; Dmn6{jyP
else if(temp[i1] data[cur]=temp[i1++]; CB6<Vng}C
else k+%6:r,r&
data[cur]=temp[i2++]; e6]u5;B
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} H{9di\xnEm
} ^TnBtIU-B
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} LL.YkYu
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改进后的归并排序: ULAAY$o@5
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package org.rut.util.algorithm.support; KLlW\MF1
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import org.rut.util.algorithm.SortUtil; j@Z4(XL
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/** bf::bV?T
* @author treeroot P b2exS(
* @since 2006-2-2 p]IF=~b
* @version 1.0 i!jxjP
*/ |WlWZ8]
public class ImprovedMergeSort implements SortUtil.Sort { ^qYJx
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private static final int THRESHOLD = 10; k6.}.
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/*
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* (non-Javadoc) WOR~tS
* }"%tlU!}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %Qrf
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*/ \h?C
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public void sort(int[] data) { KR%DpQ&{'
int[] temp=new int[data.length]; iIA&\'|;i
mergeSort(data,temp,0,data.length-1); j:\MrYt0H
} -dZ7;n5&_
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private void mergeSort(int[] data, int[] temp, int l, int r) { ytKh[Uo
int i, j, k; iLNKC'
int mid = (l + r) / 2; Kbrb;r59
if (l == r) nB WVG
return; , 0MDkXb
if ((mid - l) >= THRESHOLD) 8|OsVIe%
mergeSort(data, temp, l, mid); pMKnA.|
else ^ ,d!K2`
insertSort(data, l, mid - l + 1); u4, p.mZtb
if ((r - mid) > THRESHOLD) kW3V"twx
mergeSort(data, temp, mid + 1, r); #\_N-bVu
else "VRc R
insertSort(data, mid + 1, r - mid); \f5$L`
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for (i = l; i <= mid; i++) {
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temp = data; xJ:15eDC
} >A;Mf*E
for (j = 1; j <= r - mid; j++) { m?V4r#t
temp[r - j + 1] = data[j + mid];
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} %l(qyH)*
int a = temp[l]; [?Wt ZM^q
int b = temp[r]; GBFYa6\4sT
for (i = l, j = r, k = l; k <= r; k++) { Xk8+m>
if (a < b) { esIEi!d
data[k] = temp[i++]; mw-0n
a = temp; uK2MC?LP
} else { b*\K I
data[k] = temp[j--]; ! av
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b = temp[j]; ?k
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} D .oX>L#:
} Az8>^|@
} PV<=wc^
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/** 6-c3v
* @param data hOx'uO`x(
* @param l & gnE"
* @param i ,`ST Va-
*/ F#*vJb)
private void insertSort(int[] data, int start, int len) { *$1M=$
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); u^8:/~8K
} @`^+XP K\
} M{<cqxY
} s`B]+
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}