归并排序: ]B5q v6
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package org.rut.util.algorithm.support; ^e8~eL+
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import org.rut.util.algorithm.SortUtil; 89k9#i X
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/** _<yJQ|[z~i
* @author treeroot 'k{pWfn=<
* @since 2006-2-2 8{(;s$H~
* @version 1.0 59FAhEg
*/ yL7a*C&
public class MergeSort implements SortUtil.Sort{ 0!eZ&.h?4
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/* (non-Javadoc) vp{jh-&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jDqe)uVvtV
*/ t+|c)"\5h
public void sort(int[] data) { .FtW$Y~y
int[] temp=new int[data.length]; /RIvUC1
mergeSort(data,temp,0,data.length-1); J-au{eP^
} #t>w)`bA-
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private void mergeSort(int[] data,int[] temp,int l,int r){ sFT-aLpL@V
int mid=(l+r)/2;
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if(l==r) return ; *"d"
mergeSort(data,temp,l,mid); y.=ur,Nd
mergeSort(data,temp,mid+1,r); Fi14_{
for(int i=l;i<=r;i++){ [x
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temp=data; #9F=+[L
} F%UyFUz
int i1=l; N~=p+Ow[H
int i2=mid+1; ts<5%{M(
for(int cur=l;cur<=r;cur++){ C C;T[b&
if(i1==mid+1) n?
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data[cur]=temp[i2++]; t$m268m~
else if(i2>r) y9cW&rDH
data[cur]=temp[i1++]; hl(M0cxEWP
else if(temp[i1] data[cur]=temp[i1++]; Cdin"
else mg;+Th&
data[cur]=temp[i2++]; C{`+h163\
} D'$ki[{,
} vSb$gl5H
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改进后的归并排序: m}54yo
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package org.rut.util.algorithm.support; iSCv/Gb:,
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import org.rut.util.algorithm.SortUtil; Uf}s6#
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/** u]lf~EE
* @author treeroot Ghs{B8
* @since 2006-2-2 C!6?.\U/:c
* @version 1.0 P:eY>~m<;
*/ q"7rd?r52
public class ImprovedMergeSort implements SortUtil.Sort { D(yU:^L
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private static final int THRESHOLD = 10; w] i&N1i
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/* 0>}
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* (non-Javadoc) oKLL~X>!U
* }1=V`N(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) oJE~dY$Q
*/ .bE+dA6:v
public void sort(int[] data) { ~Gx"gK0
int[] temp=new int[data.length]; b_ +dNoB
mergeSort(data,temp,0,data.length-1); 2R66 WKQ
} 3J%(2}{y
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private void mergeSort(int[] data, int[] temp, int l, int r) { aKkL0D
int i, j, k; 2I(b ad
int mid = (l + r) / 2; |75>8;
if (l == r) F)Oe;z6
return; Z7a~M3VnZ
if ((mid - l) >= THRESHOLD) KAVe~j"
mergeSort(data, temp, l, mid); `irz'/"p
else }F=scbpXj
insertSort(data, l, mid - l + 1); 8 h
if ((r - mid) > THRESHOLD) L 1iA
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mergeSort(data, temp, mid + 1, r); R >f$*T
else 9.:r;H G
insertSort(data, mid + 1, r - mid); G;#-CT
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for (i = l; i <= mid; i++) { CV&+^_j'k
temp = data; s
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} FRqJ#yd]
for (j = 1; j <= r - mid; j++) { do@`(f3g
temp[r - j + 1] = data[j + mid]; fG_.&!P
} hfw$820y[
int a = temp[l]; cBs:7Pnp%
int b = temp[r]; COvcR.*0F
for (i = l, j = r, k = l; k <= r; k++) { }q7rR:g
if (a < b) { {=};<;_F
data[k] = temp[i++]; Z7>pz:,
a = temp; *S ,5
} else { mux_S2x9m\
data[k] = temp[j--]; Qa-]IKOs
b = temp[j]; YL*yiZ9
} 4&]Sb}
} 4JV/Ci5
} r$7fw}'I
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/** 2
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* @param data WxO2
* @param l >#~!03
* @param i |-t>_+. J'
*/ 1o5n1
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private void insertSort(int[] data, int start, int len) { av|r^zc
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); qbcaiU`-^"
} r: Ij\YQ
} 2GB)K?1M
} /BeA-\B
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}