归并排序: 3,i`FqQa
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package org.rut.util.algorithm.support; =;n>#<
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import org.rut.util.algorithm.SortUtil; OAo03KW
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/** c|m?f
* @author treeroot Z>w@3$\z
* @since 2006-2-2 0Z((cI\J
* @version 1.0 E{-pkqx
*/ s$9ow<oi]
public class MergeSort implements SortUtil.Sort{ \QSD*
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/* (non-Javadoc) 2>x[_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *S<I!7Q
*/ 4
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public void sort(int[] data) { Yx. t+a-
int[] temp=new int[data.length]; v{lDEF@2^N
mergeSort(data,temp,0,data.length-1); 8zeD%Uv
} z-0
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private void mergeSort(int[] data,int[] temp,int l,int r){ >4>.
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int mid=(l+r)/2; PMQ31f/zf
if(l==r) return ; M>RLS/r>d
mergeSort(data,temp,l,mid); )('{q}JxV
mergeSort(data,temp,mid+1,r); 7~MWp4.
for(int i=l;i<=r;i++){ ?|2m0~%V=
temp=data; yYk?K<ou
} A1zV5-E/
int i1=l; 6xh-m
int i2=mid+1;
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for(int cur=l;cur<=r;cur++){ aeLIs SEx
if(i1==mid+1)
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data[cur]=temp[i2++]; s5d[sx
else if(i2>r) I[ZWOi\-
;
data[cur]=temp[i1++]; -Vg0J6x
else if(temp[i1] data[cur]=temp[i1++]; ^=cXL
else ZZ0b!{qj3
data[cur]=temp[i2++]; ER]C;DYX
} b;mpZ|T.
} mp]UUpt
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} .$x822
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改进后的归并排序: h2]GV-
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package org.rut.util.algorithm.support; =8qhK=&]
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import org.rut.util.algorithm.SortUtil; <l9qhqHv&
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/** C\[g>_J
* @author treeroot T:j!a{_|
* @since 2006-2-2 FRE${~Xd
* @version 1.0 {-5b[m(
*/ +qF,XJ2
public class ImprovedMergeSort implements SortUtil.Sort { M^A;tPw
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private static final int THRESHOLD = 10; g5&,l
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/* vC5 (
* (non-Javadoc) b(g?X
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* ;%i.@@:IQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~hA;ji|I
*/ {[B` q
public void sort(int[] data) { TH}+'m
int[] temp=new int[data.length]; m4T`Tg#P
mergeSort(data,temp,0,data.length-1); flfE~_
} F
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private void mergeSort(int[] data, int[] temp, int l, int r) { .mS'c#~5Y
int i, j, k; gI~jf- w
int mid = (l + r) / 2; D8_-Dvp7H
if (l == r) &5wM`
return; (svd~h e2
if ((mid - l) >= THRESHOLD)
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mergeSort(data, temp, l, mid); 6JL:p{RLi
else 3UX} )mW
insertSort(data, l, mid - l + 1); s*pgR=dZZ
if ((r - mid) > THRESHOLD) AJH-V
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mergeSort(data, temp, mid + 1, r); wms8z
else 9Lxj
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insertSort(data, mid + 1, r - mid); Q|}Pc>ae
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for (i = l; i <= mid; i++) { s8N\cOd#i
temp = data; gobqS+c
} sh"\ kk9
for (j = 1; j <= r - mid; j++) { pn~$u
temp[r - j + 1] = data[j + mid]; ]LhNP}c
} rj].bGQ,+
int a = temp[l]; d6k`=Hlg
int b = temp[r]; pb5'5X+
for (i = l, j = r, k = l; k <= r; k++) { M 9b_Q
if (a < b) { 3l@={Ts
data[k] = temp[i++]; l;g8_uyjv7
a = temp; vb.`rj6
} else { uB:utg
data[k] = temp[j--]; 9m
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b = temp[j]; Z*|qbu)
} ;-d :!*
} :bgi*pR{
} uNYHEs6%T$
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/** k w!1]N
* @param data 0 .dSP$e
* @param l |3MqAvPJ
* @param i RSY{IY
*/ =ITMAC\
private void insertSort(int[] data, int start, int len) { vF K&.J
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); b='YCa
} B jR:#*<qD
} r,x;q
} &6E^<v?]
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}