归并排序: J$v0
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package org.rut.util.algorithm.support; X+
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import org.rut.util.algorithm.SortUtil; C$b$)uI;
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/** *R0Ae 4
* @author treeroot MX xRM~
* @since 2006-2-2 vn KKK. E
* @version 1.0 U8\[8~Xftn
*/ :(!il?
public class MergeSort implements SortUtil.Sort{ }pTy mAN
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/* (non-Javadoc) LTm2B_+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OGzth$7A
*/ x3MV"hm2
public void sort(int[] data) { x$cs_q]J
int[] temp=new int[data.length]; W]4Gs;
mergeSort(data,temp,0,data.length-1); ~Q0gSazXFt
} wh<+.Zp
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private void mergeSort(int[] data,int[] temp,int l,int r){ ?ye)&
int mid=(l+r)/2; {r#2X1
if(l==r) return ; +3(1QgYM%
mergeSort(data,temp,l,mid); |nk&ir6
mergeSort(data,temp,mid+1,r); $RuJm\f
for(int i=l;i<=r;i++){ f.!)O@HzH
temp=data; ik=~`3Zp0
} 1l"A7
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int i1=l; xVao3+r
int i2=mid+1; c6:"5};_
for(int cur=l;cur<=r;cur++){ ?H#]+SpOcv
if(i1==mid+1) *Sm$FMWQ
data[cur]=temp[i2++]; L
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else if(i2>r) @V
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data[cur]=temp[i1++]; F0t!k>
else if(temp[i1] data[cur]=temp[i1++]; U+3,(O
else :<YcV#!P
data[cur]=temp[i2++]; y]xG@;4M
} U
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} GU8b_~Gk?
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} 0(iTnzx0
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改进后的归并排序: [cv7s=U%
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package org.rut.util.algorithm.support; .iNPLz1
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import org.rut.util.algorithm.SortUtil; ~+d?d6*c
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/** 3@kiUbq7Eu
* @author treeroot 3/RmJ`c{
* @since 2006-2-2 rj&
* @version 1.0 aL$m
*/ (9]`3^_,J
public class ImprovedMergeSort implements SortUtil.Sort { `c ~Va/Yi
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private static final int THRESHOLD = 10; 8;mn7 XX
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/* g^OU+7o
* (non-Javadoc) 3
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*
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |v#N
*/ 8'Sw?FbVA/
public void sort(int[] data) { B.vg2N
int[] temp=new int[data.length]; -Qgu6Ty
mergeSort(data,temp,0,data.length-1); R|
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} ~gQ$etPd
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private void mergeSort(int[] data, int[] temp, int l, int r) { #m{K
int i, j, k; n0 q5|ES
int mid = (l + r) / 2; R}IMX9M=
if (l == r) ;
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return; ;|Idg"2
if ((mid - l) >= THRESHOLD) TkXD#%nFY
mergeSort(data, temp, l, mid); gVjI1{WTK
else ,7,x9qE"
insertSort(data, l, mid - l + 1); xjB2?:/2
if ((r - mid) > THRESHOLD) `VX]vumG
mergeSort(data, temp, mid + 1, r); {Tb(4or?=b
else KSU?Tg&JR
insertSort(data, mid + 1, r - mid); (NK$2A/p
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for (i = l; i <= mid; i++) { zim]3%b*A;
temp = data; g
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} *@[DG)N
for (j = 1; j <= r - mid; j++) { JYB"\VV
temp[r - j + 1] = data[j + mid]; o ?@,f/"5
} ,Q!sns[T
int a = temp[l]; U?97yc\$
int b = temp[r]; }UNRe]ft$
for (i = l, j = r, k = l; k <= r; k++) { 58)`1p\c'
if (a < b) { ]4wyuP,up
data[k] = temp[i++]; <cm,U)j2
a = temp; t<s:ut)Q!
} else { CKwrE]h
data[k] = temp[j--]; w=5 D>]
b = temp[j]; W<C
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} Hf!o6 o
} '0)a|1,
} 3;(;'5|Z
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/** \o3)\
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* @param data Qz/o-W;
* @param l -3`S;Dmn
* @param i t"Ok-!c|
*/ Q`k=VSUk
private void insertSort(int[] data, int start, int len) { lj0"2@z3"E
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); o&}!bq]
} `(s&H8x#
} Y^DS~CrM
} rmXxid
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}