归并排序: =y5~7&9'
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package org.rut.util.algorithm.support; R@h@@lSf
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import org.rut.util.algorithm.SortUtil; "E? 8.`T
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/** MNy)= d&<P
* @author treeroot >e]46K
* @since 2006-2-2 oiG@_YtR
* @version 1.0 &4aY5y`8+f
*/ FTB@70
public class MergeSort implements SortUtil.Sort{ w(lxq:>"
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/* (non-Javadoc) /0w?"2-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Yl65|=ne
*/ ?*I
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public void sort(int[] data) { b4_"dg~gK
int[] temp=new int[data.length]; =:fFu,+{
mergeSort(data,temp,0,data.length-1); \ 2Jr(?U
} (h"Yw
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private void mergeSort(int[] data,int[] temp,int l,int r){ EYwDv4H,g
int mid=(l+r)/2; \u|8MEB
if(l==r) return ; i- Le&
mergeSort(data,temp,l,mid); fO!S^<9,-
mergeSort(data,temp,mid+1,r); #3:;&@#
for(int i=l;i<=r;i++){ ] Q}z-U
temp=data; |( %3'"Z
} 9!XW):
int i1=l; =c)O8
int i2=mid+1; won(HK\1p
for(int cur=l;cur<=r;cur++){ myp}DI(
if(i1==mid+1) Y,v8eOo45S
data[cur]=temp[i2++]; J6*Zy[)%&S
else if(i2>r) HvITw%`
data[cur]=temp[i1++]; yIS.'mK
else if(temp[i1] data[cur]=temp[i1++]; tDuQ+|~M
else P,S$qD*4
data[cur]=temp[i2++]; /o<tmK_m
} 8[\(*E}d!X
} l)PEg PSRV
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} uUAib<wdPL
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改进后的归并排序: 7\'ow|)}v
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package org.rut.util.algorithm.support; O*af`J{
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import org.rut.util.algorithm.SortUtil; X#s:C=q1
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/** )N{Qpbh
* @author treeroot <{C oM
* @since 2006-2-2 :!vDX2o)\
* @version 1.0 X
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*/ %4Nq T
public class ImprovedMergeSort implements SortUtil.Sort { RvL-SI%E
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private static final int THRESHOLD = 10; X&^8[,"
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/* 'ADaz75`*r
* (non-Javadoc) E'p5
* cmQLkT"#K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~lx5RTkp
*/ C9-90,
public void sort(int[] data) { {5+t\~q$
int[] temp=new int[data.length]; s'LY)_n
mergeSort(data,temp,0,data.length-1); v})0zz?,1
} Q+ ;6\.#r
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private void mergeSort(int[] data, int[] temp, int l, int r) { &[BDqi
int i, j, k; UQl3Tq4QM
int mid = (l + r) / 2; nq#k}Qx:
if (l == r) r4}:t$
return; f-5vE9G3y7
if ((mid - l) >= THRESHOLD) ^>?gFvWB%
mergeSort(data, temp, l, mid); 5 ^}zysY`
else Im{I23.2
insertSort(data, l, mid - l + 1); _oxc~v\<
if ((r - mid) > THRESHOLD) <Bc J;X/
mergeSort(data, temp, mid + 1, r); mw<LNnT{8
else 5S'89 r3m
insertSort(data, mid + 1, r - mid); 89F^I"Im(
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for (i = l; i <= mid; i++) { P,Fs7
temp = data; Aa*UV6(v
} 3@e#E4+ff
for (j = 1; j <= r - mid; j++) { !+T9NqDv[
temp[r - j + 1] = data[j + mid]; wi]|"\
} kV7c\|N9
int a = temp[l]; &3VR)Bxn
int b = temp[r]; o.5w>l!9K
for (i = l, j = r, k = l; k <= r; k++) { #uNQ+US0
if (a < b) { c ?mCt0Cg
data[k] = temp[i++]; Bb];qYuCO
a = temp; .bbl-a/
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} else { BH0@WG7F
data[k] = temp[j--]; \AOVdnM:
b = temp[j]; Qcu1&t\ C
} Xj.Tg1^K"
} hV_eb6aj}P
} #$(F&>pj
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/** _yTGv-
* @param data ' } rUbJo
* @param l b_*Y5"(*
* @param i k<uC[)_
*/ fZ6lnZ
private void insertSort(int[] data, int start, int len) { vukI`(#
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); @bdGV#*d
} /jih;J|
} \H+/D &M
} 4os7tx
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}