归并排序: XO9M_*Va
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package org.rut.util.algorithm.support; n f.wCtf].
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import org.rut.util.algorithm.SortUtil; ;i"*Ll>Q)
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/** V %_4%
* @author treeroot m1IKVa7-\}
* @since 2006-2-2 mCWhUBghR
* @version 1.0 BA:yQ
*/ 2PeR
public class MergeSort implements SortUtil.Sort{ E^rbcGJ
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/* (non-Javadoc) K^ 3co
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^<:sdv>Y5
*/ GV^i`r^"
public void sort(int[] data) { C-?%uF
int[] temp=new int[data.length]; ]/!<PF
mergeSort(data,temp,0,data.length-1); S<L.c
} W?We6.%
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private void mergeSort(int[] data,int[] temp,int l,int r){ <97d[/7i
int mid=(l+r)/2; Sje wuIi1
if(l==r) return ; JIFU;*PR1
mergeSort(data,temp,l,mid); #CnHf
mergeSort(data,temp,mid+1,r); nD0}wiL{
for(int i=l;i<=r;i++){ <n:}kQTT
temp=data; O4g+D#Lu
} s
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int i1=l; 1O!/g
int i2=mid+1; DEw8*MN
for(int cur=l;cur<=r;cur++){ $&=p+
if(i1==mid+1) yR~R:
data[cur]=temp[i2++]; LT~YFS
else if(i2>r) Y'u7 IX}
data[cur]=temp[i1++]; Hh4 n
else if(temp[i1] data[cur]=temp[i1++]; Ic{F*nnM
else xEltwuDd?
data[cur]=temp[i2++]; A+&xMM2Wj
} 0}:2Q#
} Y(+^;Y3U
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} bO;(bE m@
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改进后的归并排序: "GQl~
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package org.rut.util.algorithm.support; K YkS9_yF
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import org.rut.util.algorithm.SortUtil; jr /lk
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/** O Lc}_
* @author treeroot Ka|eFprS
* @since 2006-2-2 zi'Jr)n
* @version 1.0 S/`%Q2za4
*/ Ln.ZVMZ;
public class ImprovedMergeSort implements SortUtil.Sort { Xwa_3Xm*Le
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private static final int THRESHOLD = 10; x-'~Bu
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/* J@L9p46,
* (non-Javadoc) S|zW^|YU
* <X_!x_x
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !~ZP{IXyo
*/ m,R Dr
public void sort(int[] data) { jDRe)bo4
int[] temp=new int[data.length]; n q19Q)
mergeSort(data,temp,0,data.length-1); ;&b%Se@#p
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private void mergeSort(int[] data, int[] temp, int l, int r) { 2T)sXB u
int i, j, k; 6QNs\Ucb+
int mid = (l + r) / 2; !'f3>W\
if (l == r) /:\3 \{?0m
return; A;J MV+2N
if ((mid - l) >= THRESHOLD) >m'x8xB=
mergeSort(data, temp, l, mid); 7$k8%lI;>
else mF09U(ci
insertSort(data, l, mid - l + 1); a{!r`>I\f
if ((r - mid) > THRESHOLD) 3SBZ>
mergeSort(data, temp, mid + 1, r); o:Zd1"Z
else ;XC@=RpX
insertSort(data, mid + 1, r - mid); U{ ;l0 2S
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for (i = l; i <= mid; i++) { *RR[H6B^]X
temp = data; vU*x2fVb}
} W"Jn(:&
for (j = 1; j <= r - mid; j++) { #Rew [\$
temp[r - j + 1] = data[j + mid]; %vO<9fE|1
} .A1\J@b
int a = temp[l]; e#/kNHl
int b = temp[r]; kzq29S
for (i = l, j = r, k = l; k <= r; k++) { ]feyJLF
if (a < b) { 3"UsZyN:
data[k] = temp[i++]; ue8qIZH
a = temp; ibdO*E
} else { '+*-s7o{
data[k] = temp[j--]; O!Wd5Y
b = temp[j]; .1 QgK
} 3|rn] yZ
} (vJ2z
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} (shK
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/** {6d b{ ay_
* @param data -Y:ROoFOZ
* @param l |c2v%'J2G
* @param i 8@M'[jT
*/ N8!TZ~1$
private void insertSort(int[] data, int start, int len) { vtMJ@!MN;
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ]]cYLaq(
} eeUp 1g
} ze'.Y%]
} fA^7^0![
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}