归并排序: "jN-Yd,z
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package org.rut.util.algorithm.support; Dqcu$V]
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import org.rut.util.algorithm.SortUtil; DP'Dg /D
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/** |>fS"u
* @author treeroot `]I5WTt*X
* @since 2006-2-2 N(/<qv
* @version 1.0 5Yibv6:3a
*/ KJ{F,fr+v
public class MergeSort implements SortUtil.Sort{ [<1+Q =;
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/* (non-Javadoc) 3 BhA.o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +mW$D@Pf
*/
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public void sort(int[] data) { TOF62,
int[] temp=new int[data.length]; la{:RlW
mergeSort(data,temp,0,data.length-1); oZcwbo8
} d`][1rZk
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private void mergeSort(int[] data,int[] temp,int l,int r){ )tQ6rd'
int mid=(l+r)/2; lJ1xx }k{U
if(l==r) return ; }Z$G=;3#
mergeSort(data,temp,l,mid); F3|pS:
mergeSort(data,temp,mid+1,r); ]Sx=y<
for(int i=l;i<=r;i++){ |DS@90}
temp=data; yN f=Kl
} p:>?
int i1=l; +=04X F:
int i2=mid+1; ITY!=>S-
for(int cur=l;cur<=r;cur++){ Hh=::Bi
if(i1==mid+1) 4O"kOEkKT>
data[cur]=temp[i2++]; >{)#|pWU
else if(i2>r) Z/UVKJm>:
data[cur]=temp[i1++]; |a:VpM
else if(temp[i1] data[cur]=temp[i1++]; ){|Lh(
else UNLNY,P/!)
data[cur]=temp[i2++]; N}<U[nh'
} .wOLi Ms
} JkDZl?x5
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改进后的归并排序: u,9U0ua@;
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package org.rut.util.algorithm.support; hg/&[/eodm
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import org.rut.util.algorithm.SortUtil; 3Ty{8oUs^
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/** NGZ>:
* @author treeroot "/h"Xg>q
* @since 2006-2-2 1gK3=Ys
* @version 1.0 !fjU?_[S
*/ MQMy Z:
public class ImprovedMergeSort implements SortUtil.Sort { h#;K9#x6
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private static final int THRESHOLD = 10; _rh.z_a7w
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/* rX
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* (non-Javadoc) Y]0y
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* ghR]$SG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CP#MNNvgrw
*/ R*#Q=_
public void sort(int[] data) { ;//qjo
int[] temp=new int[data.length]; W/X;|m`
mergeSort(data,temp,0,data.length-1); U>jk`?zW
} 3;gtuqwD$
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private void mergeSort(int[] data, int[] temp, int l, int r) { /s_$CSiB
int i, j, k; )F2tV ]k\
int mid = (l + r) / 2; `3s-\>
if (l == r) Io X9yGq
return; BV:,bS
if ((mid - l) >= THRESHOLD) >{=RQgGy
mergeSort(data, temp, l, mid); YAG3PWmD
else Z6ex<[`I
insertSort(data, l, mid - l + 1); ?kefRev<#h
if ((r - mid) > THRESHOLD) R6.#gb8^oS
mergeSort(data, temp, mid + 1, r); Q'M Ez
else 3!UP>,!
insertSort(data, mid + 1, r - mid); 3goJ(XI
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for (i = l; i <= mid; i++) { &y+*3,!n8
temp = data; yKhzymS}T
} $X]v;B)J|
for (j = 1; j <= r - mid; j++) { N Uml"
temp[r - j + 1] = data[j + mid]; BJrNbo;T
} _(
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int a = temp[l]; oIgj)AY<
int b = temp[r]; j"=jK^
for (i = l, j = r, k = l; k <= r; k++) { e-t`\5b;
if (a < b) { {<BK@U
data[k] = temp[i++]; ,gD i)]
a = temp; }TLC b/+
} else { d7gSkna`5c
data[k] = temp[j--]; |mA*[?ye@
b = temp[j]; bJ}+<##
} h /Nt92
} C(+BrIS*
} WR1,J0UU6
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/** O,6!`\N D
* @param data OaWq8MIZ-
* @param l l!'iLq"K(
* @param i )j*qGsOg
*/ Ry~LhU:
private void insertSort(int[] data, int start, int len) { 7QFEQ}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ,FO|'l
} je%12DM
} =?aB@&
} ,' B=eY,
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}