归并排序: kz7(Z'pw
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package org.rut.util.algorithm.support; FNId;
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import org.rut.util.algorithm.SortUtil; o,3a4nH;
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/** PE 5G
* @author treeroot {cw /!B
* @since 2006-2-2 k.15CA`
* @version 1.0 maR"t+
*/ cPc</[x[W
public class MergeSort implements SortUtil.Sort{ _n\GNUA
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/* (non-Javadoc) ~.lPEA %%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xA[mm
*/ Q.c\/&
public void sort(int[] data) { m9}P9?
int[] temp=new int[data.length]; w.-!UD9/.x
mergeSort(data,temp,0,data.length-1); *G9V'9
} -`TEVS?`l
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private void mergeSort(int[] data,int[] temp,int l,int r){ Pd]|:W< E
int mid=(l+r)/2; 9]o-O]7/
if(l==r) return ; %GIr&V4|
mergeSort(data,temp,l,mid); MR.'t9m2L
mergeSort(data,temp,mid+1,r); "Os_vlapHo
for(int i=l;i<=r;i++){ ps DetP
temp=data; Xm2z}X(%
} S?BG_J6A7
int i1=l; 26x[X.C:
int i2=mid+1; 1 I",L&S1
for(int cur=l;cur<=r;cur++){ Ef13Q]9|
if(i1==mid+1) &UlWCOo8
data[cur]=temp[i2++]; CQDkFQq-dq
else if(i2>r) eO[b1]WLP
data[cur]=temp[i1++]; (0kK_k'T
else if(temp[i1] data[cur]=temp[i1++]; @2v_pJy^
else =rX>1
data[cur]=temp[i2++]; 2SR: FUV/
} d4z/5Oa
} X+]G-
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} zT?D<XW>1
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改进后的归并排序: y Fq&8 x<X
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package org.rut.util.algorithm.support; hqkz^!rp
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import org.rut.util.algorithm.SortUtil; x# 5A(g
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/** k2UVm$}u
* @author treeroot F`]2O:[
* @since 2006-2-2 x.R4%Z
* @version 1.0 Y% 5eZ=z
*/ ZO$%[ftb
public class ImprovedMergeSort implements SortUtil.Sort { jdJ>9O0A,
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private static final int THRESHOLD = 10; SGlNKA},A
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/* [0D.K}7|
* (non-Javadoc) ijx0gh`~
* 0>Z_*U~6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k~
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*/ (Px OE
public void sort(int[] data) { FH+s s!
int[] temp=new int[data.length]; \v)+.m?n
mergeSort(data,temp,0,data.length-1); gCY';\f!
} "kgdbAZ
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private void mergeSort(int[] data, int[] temp, int l, int r) { TBU&6M>{3
int i, j, k; Y,zxbXZv'5
int mid = (l + r) / 2; q{;:SgZ
if (l == r) Nf1-!u7
return; l0A&9g*l2
if ((mid - l) >= THRESHOLD) QGmn#]w\\
mergeSort(data, temp, l, mid); SS.dY""89
else UFb)AnK
insertSort(data, l, mid - l + 1); 0b(N^$js'
if ((r - mid) > THRESHOLD) K:30_l<
mergeSort(data, temp, mid + 1, r); OX\F~+
else I"7u2"@-8j
insertSort(data, mid + 1, r - mid); bhlG,NTP
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for (i = l; i <= mid; i++) { GYUn6P
temp = data; p,i[W.dy.'
} jPW#(3hoE
for (j = 1; j <= r - mid; j++) { d)f :)Ew
temp[r - j + 1] = data[j + mid]; "o}+Ciul
} Otm0(+YB7
int a = temp[l]; M?uC%x+S$_
int b = temp[r]; xAMW-eF?d
for (i = l, j = r, k = l; k <= r; k++) { r<Kx0`y
if (a < b) { 3HY9\'t6
data[k] = temp[i++]; O55 xS+3^k
a = temp; !5uGd`^I
} else { cJ
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data[k] = temp[j--]; 03S]8l
b = temp[j]; 161xAig
} >]5P
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} W#WV fr
} Sa;qW3dt3E
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/** ?o#%Xs
* @param data ?zHPJLv|Y
* @param l L<{i,'M
* @param i
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*/ zi*R`;_`,
private void insertSort(int[] data, int start, int len) { naznayy
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); _Qi&J.U>
} ..'_o~Ka
} 9ahWIO%
} a\YV3NJ/A
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}