归并排序: 48%a${Nvvj
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package org.rut.util.algorithm.support; 7]9s_13]
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import org.rut.util.algorithm.SortUtil; e;}5~dSi
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/**
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* @author treeroot J=]w$e ?.P
* @since 2006-2-2 Zr2QeLQC(
* @version 1.0 u=
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*/ f{z%P I[
public class MergeSort implements SortUtil.Sort{ {78*SR
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/* (non-Javadoc) ~KfjT
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -+I! (?
*/ Ez1*}
public void sort(int[] data) { qV$',U*+T
int[] temp=new int[data.length]; $X&OGTlw^
mergeSort(data,temp,0,data.length-1); E.% F/mM
} :* /``
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private void mergeSort(int[] data,int[] temp,int l,int r){ d`nS0Tf'
int mid=(l+r)/2; $v oyXi`*
if(l==r) return ; +#H8d1^5
mergeSort(data,temp,l,mid); izWl5}+'B
mergeSort(data,temp,mid+1,r); 3S2'JOTY
for(int i=l;i<=r;i++){ i+cGw
temp=data; +[}]a3)
} /~tfP
int i1=l; 6k3l/ ~R
int i2=mid+1; &Y=NUDt_
for(int cur=l;cur<=r;cur++){ fR[!=-6^f
if(i1==mid+1) 17Gdu[E
data[cur]=temp[i2++]; S@"=,Xj M
else if(i2>r) K;xW/7?
data[cur]=temp[i1++]; sBu"$"]
else if(temp[i1] data[cur]=temp[i1++]; hA\8&pI;
else FW.dHvNX
data[cur]=temp[i2++]; Q#r 0DWo\
} D\l.?<C
} -MEz`7c~
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} Pd;ClMa%
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改进后的归并排序: &lS0"`J=
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package org.rut.util.algorithm.support; z|?R=;,u`
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import org.rut.util.algorithm.SortUtil; O`0$pn
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/** 4K;j:ZJ"x
* @author treeroot ry]7$MQyV
* @since 2006-2-2 v#+w<gRq
* @version 1.0 Y-c~"#
*/ IP;@unBl
public class ImprovedMergeSort implements SortUtil.Sort { xA5$!Oq7
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private static final int THRESHOLD = 10; yK7>^p}V
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/* omA*XXUx=8
* (non-Javadoc) `U3
* Fi/G, [q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CzEn_ZMb
*/ Mqtp}<*@-
public void sort(int[] data) { +r!h* 4
int[] temp=new int[data.length]; ?W|IC8~d')
mergeSort(data,temp,0,data.length-1); fDqXM;a"
} =GVhAzD3
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private void mergeSort(int[] data, int[] temp, int l, int r) { D5m\u$~V
int i, j, k; VfcQibm
int mid = (l + r) / 2; uY~A0I5Z
if (l == r) ck~xj0
return; c-=0l)&'D=
if ((mid - l) >= THRESHOLD) bX(*f>G'
mergeSort(data, temp, l, mid); wqOhJYc
else ,;-*q}U
insertSort(data, l, mid - l + 1); L K~,
if ((r - mid) > THRESHOLD) Qd4T?5 vG
mergeSort(data, temp, mid + 1, r); &P3vcB
else LI<5;oE;
insertSort(data, mid + 1, r - mid); ;MJ1Q
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for (i = l; i <= mid; i++) { ZO1J";>u
temp = data; 5l}h8So4
} *n'xS L
for (j = 1; j <= r - mid; j++) { Madaxx
temp[r - j + 1] = data[j + mid]; ksaC[G;}:
} 7:<Ed"rdE
int a = temp[l]; Mv=cLG?X
int b = temp[r];
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for (i = l, j = r, k = l; k <= r; k++) { \veL 5
if (a < b) { @#tSx
data[k] = temp[i++]; T_Y }1n|7[
a = temp; {@$3bQ
} else { 6<Wr
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data[k] = temp[j--]; j[`?`RyU
b = temp[j]; ,AM-cwwT:u
} eFI4(Y
} \(FDR
} ]c2| m}I{:
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/** y21uvp'
* @param data fLoVcl
* @param l ;alFK*K6
* @param i bVHi3=0{
*/ ;/T-rVND
private void insertSort(int[] data, int start, int len) { ,-Nk-g
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); <R>ZG"m {
} BD-=y
} )x &@j4,
} OF/)-}!
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}