归并排序: n`1i k'x?
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package org.rut.util.algorithm.support; .$;GVJ-:5
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import org.rut.util.algorithm.SortUtil; YTA&G
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/** m5*RB1
* @author treeroot (6b%;2k
* @since 2006-2-2 %kT:"j(xW
* @version 1.0 X8TZePh
*/ eA_4,"{
public class MergeSort implements SortUtil.Sort{ `MS=/x E
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/* (non-Javadoc) ;DpK*A
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vhW'2<(
*/ D\JYa@*?.h
public void sort(int[] data) { a gzG
int[] temp=new int[data.length]; *bK@ A2`
mergeSort(data,temp,0,data.length-1); b6ddXM\Z
} J(]nPwm=.-
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private void mergeSort(int[] data,int[] temp,int l,int r){ [z9i v~
int mid=(l+r)/2; ~%ZO8X:^
if(l==r) return ; OZD/t(4?6s
mergeSort(data,temp,l,mid); hb{(r@[WHv
mergeSort(data,temp,mid+1,r); 9"e!0Q4 0
for(int i=l;i<=r;i++){ ~Q0}>m,S
temp=data; &}ow-u9c3
} P:+:Cm<
int i1=l; idq= US
int i2=mid+1; Q\Eq(2p
for(int cur=l;cur<=r;cur++){ ,&$Y2+
if(i1==mid+1) ()Z$j,2
data[cur]=temp[i2++]; %F7k| Na
else if(i2>r) ]z,?{S
data[cur]=temp[i1++]; ur|2FS7
else if(temp[i1] data[cur]=temp[i1++]; D+U^ pl-
else iDA`pemmi&
data[cur]=temp[i2++]; %AFy{l
} f]EHDcC3X
} /"U<0jot
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} Kt-@a%O0
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改进后的归并排序: udB}`<Q
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package org.rut.util.algorithm.support; Y 4U $?%j
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import org.rut.util.algorithm.SortUtil; KLk37IY2\
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/** v{9eEk1
* @author treeroot m{g{"=}YR
* @since 2006-2-2 >\e11OU0Gy
* @version 1.0 xc!"?&\*
*/ ]T$~a8
public class ImprovedMergeSort implements SortUtil.Sort { T|u)5ww%
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private static final int THRESHOLD = 10; }*%%GPJ
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/* a^22H
* (non-Javadoc) 7"gy\_M
* h:|aQJG5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Co'dZd(
*/ UZyo:*yB
public void sort(int[] data) { Nz m
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int[] temp=new int[data.length]; I*X|pRD
mergeSort(data,temp,0,data.length-1); bNXT*HOZb3
} N-^\e)ln
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private void mergeSort(int[] data, int[] temp, int l, int r) { `8L7pbS%,Q
int i, j, k; noacnQ_I$
int mid = (l + r) / 2; z2r{AQ.&
if (l == r) E]68IuP@'
return; C&Rv)j
if ((mid - l) >= THRESHOLD) x{=ty*E
mergeSort(data, temp, l, mid); 6`4=!ZfI
else k'm!|
insertSort(data, l, mid - l + 1); )#1@@\< ^T
if ((r - mid) > THRESHOLD) !4|7U\;
mergeSort(data, temp, mid + 1, r); ]g:VvTJ;?
else X@TQD
insertSort(data, mid + 1, r - mid); <@oK^ja
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for (i = l; i <= mid; i++) { NbSwn}e_
temp = data; y$!~</=b
} NKRNEq!
for (j = 1; j <= r - mid; j++) { }v`5
temp[r - j + 1] = data[j + mid]; :Vv=p*~
} 9] l7j\L
int a = temp[l]; 9= :!XkT.
int b = temp[r]; pZXva9bE
for (i = l, j = r, k = l; k <= r; k++) { [&e}@!8O`
if (a < b) { lrK5q
data[k] = temp[i++]; _Nw-|N .
a = temp; uA,K}sNRZ
} else { zg[ksny
data[k] = temp[j--]; HuG|BjP
b = temp[j]; tlc&Wx
} z[l17+v
} qL(Qmgd
} s<n5^Vxy
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/** jytfGE:
* @param data Y*J,9
* @param l evq*&.6\
* @param i @va6,^)
*/ 5X'[{'i,
private void insertSort(int[] data, int start, int len) { }]kzj0m
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); wtaeF+u-R-
} N_h)L`
} >{V]q*[/;Q
} RaKL KZn
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}