归并排序: A*~BkvPr
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package org.rut.util.algorithm.support; C]Q`!e
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import org.rut.util.algorithm.SortUtil; ]$BC f4:
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/** Pm]lr|Q{I
* @author treeroot &
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* @since 2006-2-2 u2S8DuJ
* @version 1.0 >K<cc#Aa
*/ H;seT XL
public class MergeSort implements SortUtil.Sort{ 9PUobV_^Wo
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/* (non-Javadoc) ^3ai}Ei3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^#t6/fY.#
*/ #^}s1
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public void sort(int[] data) { h[;DRD!Z
int[] temp=new int[data.length]; )KY4BBc
mergeSort(data,temp,0,data.length-1); t`Rbn{
} Y!`pF
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private void mergeSort(int[] data,int[] temp,int l,int r){ v|KGzQx$.*
int mid=(l+r)/2; nvCp-Z$
if(l==r) return ; <G0Ut6J>
mergeSort(data,temp,l,mid); Z2 Vri
mergeSort(data,temp,mid+1,r); `An p;el
for(int i=l;i<=r;i++){ 9^&B.6! 6
temp=data; azzG
} V|TD+7.`QB
int i1=l; 3 Q~0b+k
int i2=mid+1; l cM
for(int cur=l;cur<=r;cur++){ DL#y_;#3_
if(i1==mid+1) }mo)OyIX
data[cur]=temp[i2++]; dlA0&;}z
else if(i2>r) Xf{9rZ+
data[cur]=temp[i1++]; IR{XL\WF
else if(temp[i1] data[cur]=temp[i1++]; [ahwJ F#r
else K_n
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data[cur]=temp[i2++]; 53$;ZO3
} N,Js8Z"
} G?, "AA;
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改进后的归并排序: ,|GjrT{vf
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package org.rut.util.algorithm.support; If]rg+|U
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import org.rut.util.algorithm.SortUtil; p({Lp}'
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/** ]a`"O
* @author treeroot |S~$IFN4
* @since 2006-2-2 gb4$W@N7V
* @version 1.0 +tlBOl$
*/ Ljiw9*ZI
public class ImprovedMergeSort implements SortUtil.Sort { >xA(*7
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private static final int THRESHOLD = 10; OnU-FX<
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/* &'`ki0Xh;
* (non-Javadoc) F vTswM>
* WFzM s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) q{%~(A5*H
*/ )G;Hf?M
public void sort(int[] data) { As5-@l`@
int[] temp=new int[data.length]; E#3tkFF0Z[
mergeSort(data,temp,0,data.length-1); VT-%o7%N
} Dc*
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private void mergeSort(int[] data, int[] temp, int l, int r) {
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int i, j, k; k'*vG6!
int mid = (l + r) / 2; ri-D#F)}
if (l == r) I5Ty@J#
return; pN_%>v"o
if ((mid - l) >= THRESHOLD) Pe-rwM
mergeSort(data, temp, l, mid); 8_ascvs5
else j/q&qrlL
insertSort(data, l, mid - l + 1); ~W={"n?=
if ((r - mid) > THRESHOLD) `DE_<l
mergeSort(data, temp, mid + 1, r); +]( #!}oH
else W9oWj7&h
insertSort(data, mid + 1, r - mid); BR-wL3x
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for (i = l; i <= mid; i++) { ji\&?%(B
temp = data; Jamt@=
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for (j = 1; j <= r - mid; j++) { }I MV@z B
temp[r - j + 1] = data[j + mid]; ;y{(#X#
} ?S9vYaA$
int a = temp[l]; a@Zolz_Z
int b = temp[r]; %pH|2VB#
for (i = l, j = r, k = l; k <= r; k++) { O,-NzGs
if (a < b) { H+5+;`;
data[k] = temp[i++]; Q1{9>NI
a = temp; FA\U4l-
} else { _>aP5g?Ep
data[k] = temp[j--]; 4;>HBCM4-
b = temp[j]; -E3cS
} s|:1z"q
} ,jtaTG.>
} +Wgfxk'{
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/** 8^D1u`
* @param data ]5K(}95&'
* @param l _yX.Apv]
* @param i fP6.
*/ QC!SgV
private void insertSort(int[] data, int start, int len) { ^ fyue~9u
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ,KD?kSIf
} z;?j+ZsdH
} Fa\jVFIQ
} ?Z4%u8Krvz
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}