归并排序: ~@#a*="
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package org.rut.util.algorithm.support; {<?8Y
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import org.rut.util.algorithm.SortUtil; T)',}=
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/** y*p02\)
* @author treeroot IIAmx[ b
* @since 2006-2-2 L|6I
* @version 1.0 Z[eWey_
*/ 2(m#WK7>F
public class MergeSort implements SortUtil.Sort{ qwO@>wQ}~
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/* (non-Javadoc) ?-)v{4{s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P%N)]b<c*
*/ qB&Je$_uh
public void sort(int[] data) { dP`B9>r
int[] temp=new int[data.length]; B&6lG!K'?
mergeSort(data,temp,0,data.length-1); |68k9rq
} Rz[3cN)?q
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private void mergeSort(int[] data,int[] temp,int l,int r){ RgZ9ZrE\
int mid=(l+r)/2; S5d
if(l==r) return ; UM<s#t`\3
mergeSort(data,temp,l,mid); ^)(tO$S
mergeSort(data,temp,mid+1,r); m;t&P58f
for(int i=l;i<=r;i++){ +'nMy"j1
temp=data; 1aCpeD4|)
} q'TIN{\.{
int i1=l; d`=LZio
int i2=mid+1; BRM!g9
for(int cur=l;cur<=r;cur++){ W|y;Kxy
if(i1==mid+1) D2=zrU3Y64
data[cur]=temp[i2++]; b};o:
else if(i2>r) Rd|8=`)
data[cur]=temp[i1++]; EdkIT|c{
else if(temp[i1] data[cur]=temp[i1++]; z,4 D'F&
else Ps{vN
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data[cur]=temp[i2++]; `uH7~ r^
} euVj,m
} kX8NRPW
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改进后的归并排序: QodWUbi'&
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package org.rut.util.algorithm.support; i'4.w?O Z
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import org.rut.util.algorithm.SortUtil; Ks@cwY
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/** N_Kdi%q
* @author treeroot Vzo<ma^
* @since 2006-2-2 x0:BxRx*
* @version 1.0 r a>2<
*/ DfP-(Lm)
public class ImprovedMergeSort implements SortUtil.Sort { c&FOt
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private static final int THRESHOLD = 10; :2&"ak>N
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/* S!+>{JyQ
* (non-Javadoc) y@It#!u0
* 7nFOVZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /
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*/ %:zu68Q[
public void sort(int[] data) { ! ?/:p.
int[] temp=new int[data.length]; P^48]Kj7
mergeSort(data,temp,0,data.length-1); :9Jy/7/
} /zoy,t-i
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private void mergeSort(int[] data, int[] temp, int l, int r) { cD}]4
int i, j, k; 3?@6QcHl{
int mid = (l + r) / 2; X2rKH$<g
if (l == r) 4+s6cQ]S`
return; !8|}-eFY
if ((mid - l) >= THRESHOLD) CxZh^V8LP
mergeSort(data, temp, l, mid); l`i97P?/W
else B4wRwrVI>
insertSort(data, l, mid - l + 1); x5mg<y2`Ng
if ((r - mid) > THRESHOLD) nw0#gDI|
mergeSort(data, temp, mid + 1, r); / of K7/
else (xRcG+3];
insertSort(data, mid + 1, r - mid);
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for (i = l; i <= mid; i++) { e,MsF4'
temp = data; x+pf@?w
} 2\QsF,@`YU
for (j = 1; j <= r - mid; j++) { Dfa3#{
temp[r - j + 1] = data[j + mid]; ?%}!_F`h%
} 0GXY2+p}S
int a = temp[l]; CgrQ"N5
int b = temp[r]; J}:.I>
for (i = l, j = r, k = l; k <= r; k++) { XNv2xuOc J
if (a < b) { ~~ rR< re
data[k] = temp[i++]; !hhL",
a = temp; j)6p>6
} else { yxo=eSOM
data[k] = temp[j--]; ,^97Ks
;
b = temp[j]; 0FgF,
} ;%B9mM#p~
} 6/Xs}[iJ
} dK4rrO
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/** )AQ^PBwp
* @param data va'F '|
* @param l E3]WRF;l
* @param i n=vDEX:'
*/ $
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private void insertSort(int[] data, int start, int len) { hW<v5!,
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); G7Sw\wW
} "cPg_-n
} uMS+,dXy
} u0 tlf
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}