归并排序: syf"{bBe
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package org.rut.util.algorithm.support; Bed jw =B
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import org.rut.util.algorithm.SortUtil; rb'Gve W[
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/** }GDG$QI]K&
* @author treeroot b
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* @since 2006-2-2 dt+
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* @version 1.0 ~UC/|t$
*/ ^u!Tyb8Dk
public class MergeSort implements SortUtil.Sort{ _vV&4>
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/* (non-Javadoc) TrU@mYnE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d$rUxqB.
*/ vGwD~R
public void sort(int[] data) { }~r6>7I
int[] temp=new int[data.length]; BQ&q<6Tk
mergeSort(data,temp,0,data.length-1); (iOCzZ6S
}
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private void mergeSort(int[] data,int[] temp,int l,int r){ iv+jv2ZF%
int mid=(l+r)/2; G5#}Ed4
if(l==r) return ; UX`DZb+^
mergeSort(data,temp,l,mid); qmeml_(W
mergeSort(data,temp,mid+1,r); uQ]]]Z(H'
for(int i=l;i<=r;i++){ #S%Y;ilq
temp=data; ` ]P5,
} |;9 A{#zM
int i1=l; 0nn]]B@l
int i2=mid+1; nQ17E{^pR
for(int cur=l;cur<=r;cur++){ ioNa~F&
if(i1==mid+1) (}1v^~FXj
data[cur]=temp[i2++]; N@*wi"Q
else if(i2>r) tNuC xb-
data[cur]=temp[i1++]; MJKl]&
else if(temp[i1] data[cur]=temp[i1++]; )6:]o&bZ
else Mq:'-`
data[cur]=temp[i2++]; V.Ba''E7
} fj-pNl6Gf
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改进后的归并排序: c Z6p^
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package org.rut.util.algorithm.support; w"a 9'r
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import org.rut.util.algorithm.SortUtil; *$Lz2 ]
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/** <L/M`(:=k
* @author treeroot }-{ b$6]
* @since 2006-2-2 JC&6q>$
* @version 1.0 J7ktfyQ0W
*/ *hZ~i{c,7
public class ImprovedMergeSort implements SortUtil.Sort { UOu6LD/|h
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private static final int THRESHOLD = 10; 7.$]f71z
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/* AGEZ8(h
* (non-Javadoc) QP$nDK<
* pfL2v,]g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R 5K-KSvW
*/ D(qHf9
public void sort(int[] data) { 18.Y/nZAgQ
int[] temp=new int[data.length]; i $[,-4v
mergeSort(data,temp,0,data.length-1); ..jq[(;N
} >G<\1R
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private void mergeSort(int[] data, int[] temp, int l, int r) { _b0S
int i, j, k; Bw3F7W~l
int mid = (l + r) / 2; V;iL[
if (l == r) qSEB}1
return; 8Wdkztp/S
if ((mid - l) >= THRESHOLD) O1?B{F/ e
mergeSort(data, temp, l, mid); ;JOD!|
else >.J'L5
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insertSort(data, l, mid - l + 1); m!#_CQ:
if ((r - mid) > THRESHOLD) A$7Eo`Of
mergeSort(data, temp, mid + 1, r); CV!;oB&
else e>
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insertSort(data, mid + 1, r - mid); '"`
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for (i = l; i <= mid; i++) { CxJfrI_W
temp = data; PSW#^o
} [zY!'cz?
for (j = 1; j <= r - mid; j++) { 7^B3lC)
temp[r - j + 1] = data[j + mid]; xJvLuzUD
} nHSTeFI?
int a = temp[l]; ^pJ0nY#c
int b = temp[r]; TT|-aS0l(u
for (i = l, j = r, k = l; k <= r; k++) { $!a?i@
if (a < b) { G3H#XK D
data[k] = temp[i++]; 54=}GnZN
a = temp; Dp!;7e s|
} else { nc<qbN
data[k] = temp[j--]; d2ohW|
b = temp[j]; 7k3p'FeS
} f4R1$(<
} dF$KrwDK
} rwoF}}
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/** gk"mr_03
* @param data lNHNL
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* @param l N].4"0Jv-D
* @param i y0;,dv]
*/ ?4:rP@
private void insertSort(int[] data, int start, int len) { O-Dc[t%
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); V{KjRSVf=
} m6-76ma,hi
} Wt(Kd5k0'2
} AQ-mE9>P
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}