归并排序: O;+
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package org.rut.util.algorithm.support; =A{s,UP
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import org.rut.util.algorithm.SortUtil;
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/** 7sq15oL
* @author treeroot ]w_JbFmT
* @since 2006-2-2 (;9j#x
* @version 1.0 hip't@.uE
*/ |eI!wgQx
public class MergeSort implements SortUtil.Sort{ wC?>,LOl
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/* (non-Javadoc) L$6W,D
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B$ jX%e{:S
*/ G@P+M1c
public void sort(int[] data) { 0+T:};]
int[] temp=new int[data.length]; mJZB@m u?
mergeSort(data,temp,0,data.length-1); ),J6:O&
} `Wd4d2aLG
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private void mergeSort(int[] data,int[] temp,int l,int r){ M>d^.n
int mid=(l+r)/2; 6TDa#k5v
if(l==r) return ; zZ 94_8b
mergeSort(data,temp,l,mid); K-[;w$np0
mergeSort(data,temp,mid+1,r); |7QSr!{_
for(int i=l;i<=r;i++){ bbT1p:RF
temp=data; 0BQ{ZT-Kh
} B`)TRt+'.
int i1=l; \aN7[>R.Q
int i2=mid+1; *alifdp
for(int cur=l;cur<=r;cur++){ *k@D4F ruP
if(i1==mid+1) QB3er]y0%
data[cur]=temp[i2++]; dU-nE5
else if(i2>r) zX]l$Q+
data[cur]=temp[i1++]; .d6b?t
else if(temp[i1] data[cur]=temp[i1++]; 7%Ou6P$^fr
else ?x/Lb*a^
data[cur]=temp[i2++]; UCj{
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改进后的归并排序: wxJoWbn
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package org.rut.util.algorithm.support; k$GtzjN
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import org.rut.util.algorithm.SortUtil; "B>8on8O
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/** *7w!~mn[m
* @author treeroot aNBwb9X
* @since 2006-2-2 /U})mdFm
* @version 1.0 <G'M/IR a
*/ .F N
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public class ImprovedMergeSort implements SortUtil.Sort { W ",yq|
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private static final int THRESHOLD = 10; N:;z~`
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/* 6F5g2hBz
* (non-Javadoc) WIabQ_ fX
* Tp|>(~;ai
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) my0iE:
*/ 9N<=,!;5~s
public void sort(int[] data) { 4'TssRot@h
int[] temp=new int[data.length]; ^B1$|C
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mergeSort(data,temp,0,data.length-1); >pp#>{}
} NFF!g]QN
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private void mergeSort(int[] data, int[] temp, int l, int r) { Ckc5;:b&m
int i, j, k; yb,X
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int mid = (l + r) / 2; #lO ^PK
if (l == r) A/{!w"G
return; \AIFIy
if ((mid - l) >= THRESHOLD) /P Tq.
mergeSort(data, temp, l, mid); [N#4H3GM8
else Km,%p@`m
insertSort(data, l, mid - l + 1); q0DRT4K
if ((r - mid) > THRESHOLD) {$#88Qa\-
mergeSort(data, temp, mid + 1, r); =K_&@|f+B
else |*DkriYY
insertSort(data, mid + 1, r - mid); lF
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for (i = l; i <= mid; i++) { U1(cBY
temp = data; `X)A$lLr
} [b_qC'K[
for (j = 1; j <= r - mid; j++) { 1 e]D=2y
temp[r - j + 1] = data[j + mid]; Z;,G:@,
} 0
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int a = temp[l]; |>OBpb
int b = temp[r]; i[ >U#5
for (i = l, j = r, k = l; k <= r; k++) { ^C92R"*Qu
if (a < b) { fzA Fn$[
data[k] = temp[i++]; y` {|D*
a = temp; bDm7$ (
} else { *Q)-"]O(k
data[k] = temp[j--]; %'X~9Pvi
b = temp[j]; 0b['{{X(
} %~} ,N
} )+DDIq
} w!z*?k=Da
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/** R1/c@HQw?
* @param data =XK}eQ_d
* @param l |KY-kRN7
* @param i ,FXc_BCx4
*/ !zvOCAb,
private void insertSort(int[] data, int start, int len) { K|l}+:k
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); *[m:4\
} y/:%S2za>
} I9Uj3cL\
} G&@dJ &B
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}