归并排序:
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package org.rut.util.algorithm.support; `g~T #U\>d
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import org.rut.util.algorithm.SortUtil; }2 X"
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/** !K0:0:
* @author treeroot >
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* @since 2006-2-2 ]-7$wVQ<
* @version 1.0 XXe?@w2{
*/ -9(9LU2
public class MergeSort implements SortUtil.Sort{ vnrP;T=^
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/* (non-Javadoc) jJ B+UF=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .0gF&>I}
*/ c8"9Lv
public void sort(int[] data) { N-~Uu6zr
int[] temp=new int[data.length]; B>!OW2q0D
mergeSort(data,temp,0,data.length-1); #$ Q2ijT0
} }0%~x,
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private void mergeSort(int[] data,int[] temp,int l,int r){ L+rMBa
int mid=(l+r)/2; <NVSF6`
if(l==r) return ; wE4:$+R};
mergeSort(data,temp,l,mid); (/oHj^>3N`
mergeSort(data,temp,mid+1,r); Z^'i16
for(int i=l;i<=r;i++){ Q`Z=}^
temp=data; lebwGW,!
} [J`%iU
int i1=l; ;B,6v P#
int i2=mid+1; l[G&=/R@H
for(int cur=l;cur<=r;cur++){ oQ=v:P]
if(i1==mid+1) .w .`1
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data[cur]=temp[i2++]; KO ~_
else if(i2>r) L93PDp4v
data[cur]=temp[i1++]; )U?O4| \P
else if(temp[i1] data[cur]=temp[i1++]; YoT<]'
else 9;L5#/E
data[cur]=temp[i2++]; ^ |xSU_wa
} g"F&~y/p
} Q"@x,8xW
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改进后的归并排序: <hS %I
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package org.rut.util.algorithm.support; vq.~8c1
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import org.rut.util.algorithm.SortUtil; (D?%(f
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/** ZSBa+3;z
* @author treeroot JB_<Haj
* @since 2006-2-2 cIm_~HH
* @version 1.0 %X--`91|u
*/ "5 /i
public class ImprovedMergeSort implements SortUtil.Sort { iEA$`LhO\A
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private static final int THRESHOLD = 10; a-A>A_.
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/* 4P>[]~S
* (non-Javadoc) #[Z1W8e
* ??'>kQ4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vxey$Ir
*/ _RT JEG
public void sort(int[] data) { P0Q]Ds|
int[] temp=new int[data.length]; d(=*@epjR
mergeSort(data,temp,0,data.length-1); j,]KidDWm
} p)dD{+"/2
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private void mergeSort(int[] data, int[] temp, int l, int r) { PNSV?RT*pG
int i, j, k; fP:n=A{
int mid = (l + r) / 2; K;,_P5J%
if (l == r) \V1geSoE
return; w_>SxSS7
if ((mid - l) >= THRESHOLD) |8|_^`
mergeSort(data, temp, l, mid); ||}k99y +
else <hJ%]]
insertSort(data, l, mid - l + 1); *hk8[
if ((r - mid) > THRESHOLD) s`Y8&e.Yr
mergeSort(data, temp, mid + 1, r); *-zOQ=Y
else r?:zKj8/u
insertSort(data, mid + 1, r - mid); T[?toqkD>z
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for (i = l; i <= mid; i++) { Oi?+Z:lak
temp = data; vC#
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} oB$P6
for (j = 1; j <= r - mid; j++) { hB!>*AsG
temp[r - j + 1] = data[j + mid]; *(?tf{
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int a = temp[l]; oZ/z{`
int b = temp[r]; vi4lmkyh^
for (i = l, j = r, k = l; k <= r; k++) { mPmg6Qj(W
if (a < b) { w[/_ o,R
data[k] = temp[i++]; 0+iaO"%
a = temp; fH>I/%
} else { 5LkpfmR
data[k] = temp[j--]; .!B>pp(9
b = temp[j]; c9
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} HRG2sv T4t
} dw"Tv~
} BJL*Dihm[
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/** T1([P!g*
* @param data TA~FP#.
* @param l fbjT"jSzw
* @param i HgY> M`U
*/ m|c5X)}-
private void insertSort(int[] data, int start, int len) { b}C6/zW
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); uQ_s$@brI
} 3[a&|!Yw
} d.)%C]W{
} x,+2k6Wn!
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}