归并排序: {1[8,Ho
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package org.rut.util.algorithm.support; va\cE*,@ns
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import org.rut.util.algorithm.SortUtil; E),T,
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/** rE
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* @author treeroot O#g31?TO
* @since 2006-2-2 lf 3W:0K
* @version 1.0 CAfG3;
*/ -VL3em|0
public class MergeSort implements SortUtil.Sort{ L-yC 'C
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/* (non-Javadoc) u- ,=C/iU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^)WGc/
*/ cVN|5Y
public void sort(int[] data) { rnUe/HjH
int[] temp=new int[data.length]; :B
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mergeSort(data,temp,0,data.length-1); \TjsXy=:)
} (Q&Z/Fe
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private void mergeSort(int[] data,int[] temp,int l,int r){ NR" Xn7G
int mid=(l+r)/2; hz!.|U@,{<
if(l==r) return ; {dDU^7O
mergeSort(data,temp,l,mid); Q =Z-vTD+
mergeSort(data,temp,mid+1,r); j1)w1WY0@
for(int i=l;i<=r;i++){ *=rl<?tX
temp=data; @L0.Z1 ).
} sqhM[u
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int i1=l; ^+88z>
int i2=mid+1; $P$OWp?b
for(int cur=l;cur<=r;cur++){ $|AxQQ%f
if(i1==mid+1) h8Gp>b
data[cur]=temp[i2++]; pV_2JXM~@
else if(i2>r) *5^h>Vk/
data[cur]=temp[i1++]; :0/I2:
else if(temp[i1] data[cur]=temp[i1++]; ;TYkJH"
else ~ ~&M&Fe
data[cur]=temp[i2++]; &0'BCT
} -O\`G<s%
} c(:GsoO
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} #-{4F?DA]y
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改进后的归并排序: o4xZaF4+
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package org.rut.util.algorithm.support; !^w+<p
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import org.rut.util.algorithm.SortUtil; [dL#0~CL$
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/** /J^yOR9
* @author treeroot O3S_P]{*ny
* @since 2006-2-2 mU;TB%#)
* @version 1.0 yA~W|q(/V
*/ N7XRk=J
public class ImprovedMergeSort implements SortUtil.Sort { Y:O%xtGi
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private static final int THRESHOLD = 10; YkTEAI|i
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/* /IODRso/!
* (non-Javadoc) 6u7>S?
* nCt:n}+C7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >#SQDVFf
*/ ."dmL=
public void sort(int[] data) { p\Jz<dkN1
int[] temp=new int[data.length]; J*.qiUAgW
mergeSort(data,temp,0,data.length-1); mhL,:UE
} )tB mSVprl
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private void mergeSort(int[] data, int[] temp, int l, int r) { )]'?yS"
int i, j, k; E1=]m
int mid = (l + r) / 2; Lf3:' n
if (l == r) cJ&%XN
return; o@}Jd0D4
if ((mid - l) >= THRESHOLD) !RV}dhI
mergeSort(data, temp, l, mid); ? r^+-
else 7^=O^!sa
insertSort(data, l, mid - l + 1); |dXmg13( -
if ((r - mid) > THRESHOLD) S~hNSw(-
mergeSort(data, temp, mid + 1, r); -[Q%Vv!8
else $Ad 5hkz
insertSort(data, mid + 1, r - mid); 3eD#[jkAI;
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for (i = l; i <= mid; i++) { B+ +:7!
temp = data; ~nw]q<7r
} /_v@YB!0
for (j = 1; j <= r - mid; j++) { D3$}S{Yw1
temp[r - j + 1] = data[j + mid]; ht` !@B
} \xwE4K
int a = temp[l]; +c?1\{M
int b = temp[r]; kP3'BBd,
for (i = l, j = r, k = l; k <= r; k++) { [/xw5rO%
if (a < b) { lj(}{O
data[k] = temp[i++];
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a = temp; G}d@^9FkE
} else { ^8-CUH\
data[k] = temp[j--]; vn7<>k>dx
b = temp[j]; %R(1^lFI$
} 0@vSl%I+
} r!'\$(m E
} [;%qxAB/_
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/** 7YrX3Hx8
* @param data 46Vx)xX
* @param l YQLp#
* @param i (=,p"3^
*/ ;vnG
private void insertSort(int[] data, int start, int len) { \^i/:
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); C[gy{40}
} 8V?O=3<a
} HsO4C)/
} B/7c`V
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}