归并排序: FrIgu k1
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package org.rut.util.algorithm.support; n?
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import org.rut.util.algorithm.SortUtil; y9cW&rDH
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/** ' jf$3
* @author treeroot "W?<BpV~@!
* @since 2006-2-2 +ng8!k
* @version 1.0 {r?O>KDQf(
*/ jSsbLa@
public class MergeSort implements SortUtil.Sort{
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/* (non-Javadoc) y)0r%=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7hlgm7^
*/ n{s
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public void sort(int[] data) { [y7BHikX)
int[] temp=new int[data.length]; !_3Rd S
mergeSort(data,temp,0,data.length-1); dq+VW}[EO
} Z@nWx]iz
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private void mergeSort(int[] data,int[] temp,int l,int r){ k1e0kxn
int mid=(l+r)/2; "94e-Nx
if(l==r) return ; UA>UW!I
mergeSort(data,temp,l,mid); Mj&q"G
mergeSort(data,temp,mid+1,r); j7IX"O%f\
for(int i=l;i<=r;i++){ (C
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temp=data; {*RyT.J
} .]SE>3
int i1=l; l}:&}
int i2=mid+1; /o Q^j'v
for(int cur=l;cur<=r;cur++){ ^oDC F
if(i1==mid+1)
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data[cur]=temp[i2++]; W3Oj6R
else if(i2>r) u,mC`gz
data[cur]=temp[i1++]; >`R}ulz)
else if(temp[i1] data[cur]=temp[i1++]; ebxpKtEC
else (RW02%`jjy
data[cur]=temp[i2++]; iG( )"^G
} ~>2@55wElp
} !C]0l
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} i0;
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改进后的归并排序: K;^$n>Y
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package org.rut.util.algorithm.support; D/[(}o(
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import org.rut.util.algorithm.SortUtil; -'ePx f
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/** O~sv^
* @author treeroot ?:73O`sX:
* @since 2006-2-2 8,d<&3D
* @version 1.0 ^Tgu]t
*/ K: hZ
public class ImprovedMergeSort implements SortUtil.Sort { JR>#PJ,N-
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private static final int THRESHOLD = 10; <Yif-9
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/* BV_rk^}Ur
* (non-Javadoc) ~5g2~.&*
* ' P5ttI#|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zg L0v5vk
*/ {=};<;_F
public void sort(int[] data) { Qk 2^p^ T6
int[] temp=new int[data.length]; +ExXhT
mergeSort(data,temp,0,data.length-1); }QrBN:a$(
} ?"-%>y@w
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private void mergeSort(int[] data, int[] temp, int l, int r) { -]HPDN,OB
int i, j, k; j:ze5F A+
int mid = (l + r) / 2; s~(!m. R
if (l == r) Hs,pY(l^
return; 6%?bl{pNn
if ((mid - l) >= THRESHOLD) Z&BJ/qk
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mergeSort(data, temp, l, mid); ]U?)_P@}
else ,tqMMBwC~_
insertSort(data, l, mid - l + 1); 3Run.Gv\
if ((r - mid) > THRESHOLD) V/xGk9L~
mergeSort(data, temp, mid + 1, r); eFJ .)Z
else *q**,_?;
insertSort(data, mid + 1, r - mid); |e49F
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for (i = l; i <= mid; i++) { \[u7y. b
temp = data; =M39I&N
} l`"i'P
for (j = 1; j <= r - mid; j++) { {6}H}_(]
temp[r - j + 1] = data[j + mid]; \o}m]v
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} A9qbE
int a = temp[l]; 5A^$!q P
int b = temp[r]; 3jH-!M5
for (i = l, j = r, k = l; k <= r; k++) { 3,;;C(
if (a < b) { CRXIVver
data[k] = temp[i++]; BOqu$f+
a = temp; b7;`A~{9v
} else { hdW}._
data[k] = temp[j--]; ,n)f=q*%
b = temp[j]; ?VUW.-
} 2L?jp:$;X
} }_,1i3Rip
} W%$sA}O
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/** i
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* @param data |KH9 81
* @param l }C6RgE.6<
* @param i ]nmVT~lBe"
*/ =Rv!c+?
private void insertSort(int[] data, int start, int len) { Q)vf>LwC2S
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); )o4B^kq
} ^xz*%2@
} O>FE-0rW}e
} &?[uY5Mk
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}