归并排序: uVQH,NA,
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package org.rut.util.algorithm.support; ;F/yS2p
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import org.rut.util.algorithm.SortUtil; ]I+"";oQGB
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/** ]+!{^h$
* @author treeroot n B5 :X
* @since 2006-2-2 b%TS37`^[
* @version 1.0 YM:;mX5B
*/ '1jG?D
public class MergeSort implements SortUtil.Sort{ -F-RWs{yS
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/* (non-Javadoc) Q7~9~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) w,,QXJe{Z_
*/ N 9.$--X}D
public void sort(int[] data) { 1;U
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mergeSort(data,temp,0,data.length-1); &{x%"Aq/
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private void mergeSort(int[] data,int[] temp,int l,int r){ l$1z%|I
int mid=(l+r)/2; !'
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if(l==r) return ; oC~8h8"l
mergeSort(data,temp,l,mid); |2YkZ nJn
mergeSort(data,temp,mid+1,r); sM4Qu./
for(int i=l;i<=r;i++){ {1<XOp#b
temp=data; n0nvp@?7bJ
} @jKiE%OP
int i1=l; {DI`HB[
int i2=mid+1; BJ
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if(i1==mid+1) FRSz3^A w
data[cur]=temp[i2++]; iPD5
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else if(i2>r) `Wes!>Vh!
data[cur]=temp[i1++]; wU9H=w^
else if(temp[i1] data[cur]=temp[i1++]; hZ#ydI|
else N`G*
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data[cur]=temp[i2++]; }%&hxhR^t3
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改进后的归并排序: [32]wgw+{1
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package org.rut.util.algorithm.support; 3k#?E]'
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import org.rut.util.algorithm.SortUtil; TIs~?wb$
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/** DaA9fJ7a
* @author treeroot d~G, *
* @since 2006-2-2 D.Q9fa&P
* @version 1.0 !vaS fL*]
*/ p}b:(QN~m
public class ImprovedMergeSort implements SortUtil.Sort { c Nhy.Z~D
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private static final int THRESHOLD = 10; fAW(
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/* z
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* (non-Javadoc) P
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C\Y%FTS:
*/ h~!KNF*XW
public void sort(int[] data) { \z~wm&
int[] temp=new int[data.length]; v>p UVM
mergeSort(data,temp,0,data.length-1); U#u=9%'
} 3? R56$-+
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private void mergeSort(int[] data, int[] temp, int l, int r) { B8f BX!u/
int i, j, k; 5$<\
int mid = (l + r) / 2; sDylSYq
if (l == r) j,]KidDWm
return; 1\[En/6
if ((mid - l) >= THRESHOLD) K4r"Q*h
mergeSort(data, temp, l, mid); B7*^rbI:X
else h()Ok9]
insertSort(data, l, mid - l + 1); oPqWL9]
if ((r - mid) > THRESHOLD) )\k({S
mergeSort(data, temp, mid + 1, r); ;fdROI
else !LG 5q/}&
insertSort(data, mid + 1, r - mid); l/wdu(
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for (i = l; i <= mid; i++) { cl`!A2F1G#
temp = data; pX\Y:hCug
} zZhAH('fG
for (j = 1; j <= r - mid; j++) { xT]|78h$
temp[r - j + 1] = data[j + mid]; Pl>BTo>p'
} BE#s@-zR=p
int a = temp[l]; o \#C#NiT
int b = temp[r]; 75^U<Hz-3{
for (i = l, j = r, k = l; k <= r; k++) { 9{A[n}
if (a < b) { U= Gw(
data[k] = temp[i++]; *-zOQ=Y
a = temp; &|d6
} else { '
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data[k] = temp[j--]; 2!}:h5
b = temp[j]; P2j"L#%
} Wubvvm8U
} "-WEUz
} Bb~Q]V=x;
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/** !"G|y4O
* @param data VbwB<nQl
* @param l &&Uc%vIN
* @param i "f1`6cx6
*/ [myIcLp^aP
private void insertSort(int[] data, int start, int len) { $*KM%M6
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); daX$=n
} bg =<) s
} PQ#zF&gL9t
} w@jC#E\
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}