归并排序: 82QGS$0V
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package org.rut.util.algorithm.support; 5_z33,q2
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import org.rut.util.algorithm.SortUtil; X6mqi;+
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/** lAJxr8 .
* @author treeroot P}TI
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* @since 2006-2-2 fmiz,$O4?
* @version 1.0 AG?dGj^
*/ g;8jK8Kh
public class MergeSort implements SortUtil.Sort{ Qe5U<3{JZ
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/* (non-Javadoc) Tp_L%F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) nCj2N,mT
*/ NZ-\h
public void sort(int[] data) { g47-db"5
int[] temp=new int[data.length]; 0 rXx RQ
mergeSort(data,temp,0,data.length-1); e*;c(3>(
} ZOQTINf
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private void mergeSort(int[] data,int[] temp,int l,int r){ .D:Z{|.1
int mid=(l+r)/2; \a6^LD}B
if(l==r) return ; f/Hm{<BY
mergeSort(data,temp,l,mid); ]jaQ[g$F
mergeSort(data,temp,mid+1,r); 75T7+:p
for(int i=l;i<=r;i++){ [-;_ZFS{
temp=data; Qkd<sxL
} YJ;j x0
int i1=l; Yl#Rib
int i2=mid+1; k'IYA#T6
for(int cur=l;cur<=r;cur++){ ,>eMG=C; g
if(i1==mid+1) D[mSmpjE6&
data[cur]=temp[i2++]; Y<Xz
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else if(i2>r) <Gt2(;
data[cur]=temp[i1++]; xgNJ eQ
else if(temp[i1] data[cur]=temp[i1++]; o;=l^-
else \CXQo4P
data[cur]=temp[i2++]; $;/}?QY(
} bVL9vNK
} IuOgxm~Y
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改进后的归并排序: nM-h&na{s
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package org.rut.util.algorithm.support; j|/]#@Yr
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import org.rut.util.algorithm.SortUtil; ;M_o)OS3
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/** I-WhH>9
* @author treeroot k7>|q"0C
* @since 2006-2-2 a e*Mf7
* @version 1.0 kRTwaNDOD
*/ yfx7{naKC`
public class ImprovedMergeSort implements SortUtil.Sort { v}tag#f5>?
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private static final int THRESHOLD = 10; K a6,<C
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/* 9XRZ$j}L
* (non-Javadoc) NDs!a
* :bWUuXVtJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >OG:vw)E
*/ BvR-K\rx
public void sort(int[] data) { -GqT7`:(H4
int[] temp=new int[data.length]; <YOLx R
mergeSort(data,temp,0,data.length-1); GW$.lo1|)
} O=$~O\}b
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private void mergeSort(int[] data, int[] temp, int l, int r) { GF>'\@Th
int i, j, k; o4%y>d)
int mid = (l + r) / 2; mdq;R*`
if (l == r) n[]tXrhU
return; MH{GR)ng:9
if ((mid - l) >= THRESHOLD) Q<KvBgmT
mergeSort(data, temp, l, mid); j~+>o[c
else B';6r4I-
insertSort(data, l, mid - l + 1); ;Y;qg
if ((r - mid) > THRESHOLD) -Y
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mergeSort(data, temp, mid + 1, r); .h&
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else ;Wl+zw
insertSort(data, mid + 1, r - mid); Ty<L8+B|
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for (i = l; i <= mid; i++) { (vB<%l.&
temp = data; Nof3F/2 N&
} =Apxdnz,
for (j = 1; j <= r - mid; j++) { ObE,$_ k
temp[r - j + 1] = data[j + mid]; wAz&"rS
} +q)5dYRzV
int a = temp[l]; X*,%&6O*
int b = temp[r]; 5e}A@GyC
for (i = l, j = r, k = l; k <= r; k++) { h~(D@/tB
if (a < b) { S=nP[s
data[k] = temp[i++]; Vg>( Y,
a = temp; u&9 r2R959
} else { V`RNM%Y
data[k] = temp[j--]; qpsvi.S
b = temp[j]; q-`RI*1]
} Qed.4R:o
} 9{$<0,?
} GQl$yZaK{
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/** -CR?<A4mud
* @param data N*`b%XGn3
* @param l l6~-8d+lfN
* @param i 8-lOB
*/ q~59F@
private void insertSort(int[] data, int start, int len) { x&`~R>5/
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Rt{B(L.?<
} :T._ba3|
} VL/|tL>E^
} N,f4*PQ
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}