归并排序: !3d+"tL
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package org.rut.util.algorithm.support; 8n1Sy7K!;
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import org.rut.util.algorithm.SortUtil; `O0v2?/f0
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/** "(T@*"vX2
* @author treeroot I
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* @since 2006-2-2 A1Rt
* @version 1.0 ~#@sZ0/<
*/ l}Jf;C*j1z
public class MergeSort implements SortUtil.Sort{ E^Q|v45d
wnhac}
/* (non-Javadoc) Oh-HfJyi
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^;Ap-2Ww
*/ s+o/:rrxY
public void sort(int[] data) { z8jQaI]j
int[] temp=new int[data.length]; R\1#)3e0
mergeSort(data,temp,0,data.length-1); d];E99}
} j$Gb>Ex>
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private void mergeSort(int[] data,int[] temp,int l,int r){ d%5QEVV
int mid=(l+r)/2; ="<+^$7:k
if(l==r) return ; g:O~1jq
mergeSort(data,temp,l,mid); ~h tV*R
mergeSort(data,temp,mid+1,r); Y0aO/6
for(int i=l;i<=r;i++){ Y7]N.G3,]
temp=data; :Uj+iYE8Z8
} ,W7\AY07]
int i1=l; >*B/Wy
int i2=mid+1; |OhNQoTY
for(int cur=l;cur<=r;cur++){ jQC6N#L
if(i1==mid+1) IWsB$T
data[cur]=temp[i2++]; &*/8Ojv)9
else if(i2>r) xG\&QE
data[cur]=temp[i1++]; buG0#:
else if(temp[i1] data[cur]=temp[i1++]; 9<}d98
else ?L+@?fVN
data[cur]=temp[i2++]; ?4(uwXp
} _
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} nW!rM($q
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} P%g[!9
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改进后的归并排序: Cd"O'<^Sb
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package org.rut.util.algorithm.support; ?)'j;1_=E3
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import org.rut.util.algorithm.SortUtil; B/c_pRl;
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/** }<9*eAn`
* @author treeroot .~4%TsBaY
* @since 2006-2-2 n,bZj<3t
* @version 1.0 '9H7I! L@
*/ w%GEOIj}
public class ImprovedMergeSort implements SortUtil.Sort { BO5F6lyQ0P
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private static final int THRESHOLD = 10; VSc;}LH
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/* 4?jXbC k~x
* (non-Javadoc) dNB56E)5`J
* oIAP dn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /<\>j+SC
*/ 6,ylkf3
public void sort(int[] data) { ]Z&2
int[] temp=new int[data.length]; ^
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mergeSort(data,temp,0,data.length-1); !6'j
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} A=Q"IdK
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private void mergeSort(int[] data, int[] temp, int l, int r) { (B.J8`h }
int i, j, k; G sm5L<rx
int mid = (l + r) / 2; W1w)SS
if (l == r) o;7!$v>uK
return; #f5-f
if ((mid - l) >= THRESHOLD) k$9oUE,
mergeSort(data, temp, l, mid); ^D/:[
else Ie`kzssM
insertSort(data, l, mid - l + 1); Qb!9QlW
if ((r - mid) > THRESHOLD) lBvQ?CJ<y
mergeSort(data, temp, mid + 1, r); PMC5qQ%x
else Ugzq;}V#
insertSort(data, mid + 1, r - mid); " )T;3/c
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for (i = l; i <= mid; i++) { ")LcB'C
temp = data; pLi_)(#z_
} qT}<D`\
for (j = 1; j <= r - mid; j++) { N#
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temp[r - j + 1] = data[j + mid]; UPQ?vh2F2
} |Am
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int a = temp[l]; da<B6!
int b = temp[r]; 2ZW
{
for (i = l, j = r, k = l; k <= r; k++) { 6V)P4ao
if (a < b) { L,6v!9@
data[k] = temp[i++]; .&fG_(6|
a = temp; |Xz-rgkQ
} else { C.`C T7
data[k] = temp[j--]; vJTdZ p
b = temp[j]; NH+?7rf8
} 4+Aht]$hC
} .)J7 \z8m
} lr[U6CJY
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/** otTv,T182
* @param data } o^VEJc`O
* @param l ,=!_7'm
* @param i 5eS0
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*/ !C ]5_
private void insertSort(int[] data, int start, int len) { v;_m1UpuW
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); aTXmF1_n
} iF0x>pvJ@
} #_oN.1u57
} oN3DM;
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}