归并排序: ?D6|~k
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package org.rut.util.algorithm.support; l^$'6q"
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import org.rut.util.algorithm.SortUtil; 5KDCmw
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/** H
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* @author treeroot [qC0YM
* @since 2006-2-2 Nd+1r|e'
* @version 1.0 GKjtX?~1
*/ u>G9r#~`k
public class MergeSort implements SortUtil.Sort{ r/HCWs|
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/* (non-Javadoc) VX82n,'=t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) TVx
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*/ "wuO[c&%/
public void sort(int[] data) { jd,i=P%
int[] temp=new int[data.length]; ~%C F3?e6
mergeSort(data,temp,0,data.length-1); [0hahR
} Lr5{c5M
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private void mergeSort(int[] data,int[] temp,int l,int r){ O`@-
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int mid=(l+r)/2; =<#G~8WYz
if(l==r) return ; U4^c{KWS
mergeSort(data,temp,l,mid); tXH;4K@
mergeSort(data,temp,mid+1,r); lixM0
for(int i=l;i<=r;i++){ cJv/)hRaz
temp=data; {=?(v`88
} *coUHbP9>
int i1=l; AWYlhH4c?t
int i2=mid+1; >;'0ymG.`
for(int cur=l;cur<=r;cur++){ SOOJq C
if(i1==mid+1) {wsJ1v8!
data[cur]=temp[i2++]; jU7[z$GX
else if(i2>r) * Ogf6
data[cur]=temp[i1++]; ,a,2I
else if(temp[i1] data[cur]=temp[i1++]; )5LT!14
else 6_])(F3+w.
data[cur]=temp[i2++]; y(MB_B7j
} N%xCyZ
} ,ofE*Wt
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改进后的归并排序: <n 06(9BF
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package org.rut.util.algorithm.support; DKu$u ]Z
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import org.rut.util.algorithm.SortUtil; 7U_ob"`JV
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/** u~j
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* @author treeroot R:YVmqd
* @since 2006-2-2 FZ?eX`,
* @version 1.0 BZHoRd{EH
*/ ]W14'Z
public class ImprovedMergeSort implements SortUtil.Sort { Xd5s8C/}
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private static final int THRESHOLD = 10; <j>;5!4!}
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/* Ec}%!p_$
* (non-Javadoc) DAP/
* .ex;4( -!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8K?}!$fz
*/ ThgJ
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public void sort(int[] data) { *bf 5A9
int[] temp=new int[data.length]; <{Y3}Q
mergeSort(data,temp,0,data.length-1); NRJp8G Z%U
} DE?k|Get2
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private void mergeSort(int[] data, int[] temp, int l, int r) { QfAmGDaYQ
int i, j, k; _^#eO`4"
int mid = (l + r) / 2; +cqUp6x.
if (l == r) q,@#
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return; h!%y,4IBR
if ((mid - l) >= THRESHOLD) m2jts(stp
mergeSort(data, temp, l, mid); 6bhb_U'f
else <
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insertSort(data, l, mid - l + 1); CYgokS\=,
if ((r - mid) > THRESHOLD) ZxSFElDD]E
mergeSort(data, temp, mid + 1, r); <tFq^qB
else (,#m+
insertSort(data, mid + 1, r - mid); a;Y:UwD9*
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for (i = l; i <= mid; i++) { xS tsw5d
temp = data; 6h)_{|
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} ]"uG04"Vk
for (j = 1; j <= r - mid; j++) { *>:phs~r{
temp[r - j + 1] = data[j + mid]; 8Iw)]}T'
} {+hABusq
int a = temp[l]; .=J- !{z
int b = temp[r]; ocW~I3
for (i = l, j = r, k = l; k <= r; k++) { 6,q_M(;c
if (a < b) { 7;AK=;
data[k] = temp[i++]; I V#8W
a = temp; UtTlJb{-j
} else { CU\gx*=E
data[k] = temp[j--]; xm1di@
b = temp[j]; pXO09L/nv
} \DS*G7.A+&
} g:)iEw>a
} LX7P?j
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/** te-xhJ&K
* @param data tm.60udbo
* @param l {{Ox%Zm
* @param i
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*/ (~N?kh:
private void insertSort(int[] data, int start, int len) { S,6/X.QBv
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); zgEN2d
} 0a{hCx|$J
} 7`J2/(
} n'V{
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}