归并排序: A?@@*$&
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package org.rut.util.algorithm.support; {iq3|x2[ :
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import org.rut.util.algorithm.SortUtil; {H{X[p8
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/** LbII?N8`N
* @author treeroot T t>8?
* @since 2006-2-2 $\?yAE
* @version 1.0 Rd>B0;4
*/ a:_I
public class MergeSort implements SortUtil.Sort{ 2r6'O6v
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/* (non-Javadoc) ~M(5Ho
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _fwb!T}$
*/ h/,${,}J
public void sort(int[] data) { <Tot|R;
int[] temp=new int[data.length]; G\a8B#hg
mergeSort(data,temp,0,data.length-1); ,<Q~b%(3
} W'on$mB5<
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private void mergeSort(int[] data,int[] temp,int l,int r){ 5IbJ
int mid=(l+r)/2; 0j_bh,zG#
if(l==r) return ; 8O"U 0
mergeSort(data,temp,l,mid); .E@|D6$D
mergeSort(data,temp,mid+1,r); RO3oP1@B
for(int i=l;i<=r;i++){ 5H9r=a
temp=data; C-?!S
} Q*XE
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int i1=l; q}FVzahv
int i2=mid+1; aBzszp]l+
for(int cur=l;cur<=r;cur++){ @+WQ ^
if(i1==mid+1) C8L'si
data[cur]=temp[i2++]; +L=*:e\j
else if(i2>r) y8\S}E0
data[cur]=temp[i1++]; @EoZI~
else if(temp[i1] data[cur]=temp[i1++]; )aX2jSp
else %riK+
data[cur]=temp[i2++]; k'PQ}
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} 3.)b4T
} Zx$ol;Yd
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} EbZdas!l
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改进后的归并排序: 4&cL[Ny
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package org.rut.util.algorithm.support; ;2m<CSv!D
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import org.rut.util.algorithm.SortUtil;
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/** SAY
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* @author treeroot 4R8G&8b
* @since 2006-2-2 _pH{yhA
* @version 1.0 d`
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*/ +B|7p9qy
public class ImprovedMergeSort implements SortUtil.Sort { ]p!Gt,rYq
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private static final int THRESHOLD = 10; cc44R|Kr$$
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/* {ccIxL
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* (non-Javadoc) 7_# 1Ec|;
* =KT7nl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -ti{6:H8
*/ .6~`Ubr}E
public void sort(int[] data) { **>/}.%?K
int[] temp=new int[data.length]; /xJqJ_70X
mergeSort(data,temp,0,data.length-1); g`>og^7g
} R3X{:1{j
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private void mergeSort(int[] data, int[] temp, int l, int r) { Xq4|uuS-O
int i, j, k; J/A[45OD
int mid = (l + r) / 2; A!63p$VT;
if (l == r) gip/(/NX
return; |~<N -~.C
if ((mid - l) >= THRESHOLD) rbZ[!LA
mergeSort(data, temp, l, mid); C;~*pMAYe
else $Q+s/4\
insertSort(data, l, mid - l + 1); V|>oGtt7
if ((r - mid) > THRESHOLD) gLsU:aeCT
mergeSort(data, temp, mid + 1, r); fj ,m
else Ay{t254/
insertSort(data, mid + 1, r - mid); 7P7b8]
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for (i = l; i <= mid; i++) { !rhk
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temp = data; eb|i3.
} *xR
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for (j = 1; j <= r - mid; j++) { rNl.7O9b
temp[r - j + 1] = data[j + mid]; j'p1q
} +([!A6:
int a = temp[l]; *Ul*%!?D
int b = temp[r]; 19q{6X`x
for (i = l, j = r, k = l; k <= r; k++) { @InZ<AW>|
if (a < b) { |3?
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data[k] = temp[i++]; ,DnYtIERo
a = temp; mceG!@t
} else { 1t9 .fEmT
data[k] = temp[j--]; rbqo"g`
b = temp[j]; FP"$tt (
} c6Q(Ygc
} J g$xO@.
} Ei({`^
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/** $ex!!rqN|
* @param data {0YAzZ7
* @param l 4F MAz^
* @param i Brd,Eg
*/ DDd|T;8
private void insertSort(int[] data, int start, int len) {
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); =22ALlxk
} A 699FQ
} B8I4[@m>w\
} [XlB<P=|>
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}