归并排序: mJ<`/p?:
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package org.rut.util.algorithm.support; z/4<x?}+hE
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import org.rut.util.algorithm.SortUtil; I@Hx
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/** 1]=X
* @author treeroot lPxhqF5pP
* @since 2006-2-2 0*5Jq#5
* @version 1.0 "o`?-bQ:
*/ iQ:eR]7X
public class MergeSort implements SortUtil.Sort{ %?].(
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/* (non-Javadoc) P7=`P
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ef '?O
*/ =l/Dc=[
public void sort(int[] data) { &gr 8;O:0
int[] temp=new int[data.length]; `dV2\^*A
mergeSort(data,temp,0,data.length-1); Ot-P
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} OeASB}
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private void mergeSort(int[] data,int[] temp,int l,int r){ X\Zan$oi
int mid=(l+r)/2; T~/>U&k}J
if(l==r) return ; GIEQD$vy
mergeSort(data,temp,l,mid); & tT6.@kH
mergeSort(data,temp,mid+1,r); `WL3aI":
for(int i=l;i<=r;i++){ ZYWGP:Y
temp=data; &v((tZ
} i*:QbMb
int i1=l; JRz)A4P
int i2=mid+1; N9G xJ6
for(int cur=l;cur<=r;cur++){ .lb]Xa*n
if(i1==mid+1) K2x2Y=
data[cur]=temp[i2++]; `B3-#!2X
else if(i2>r) Izu____
data[cur]=temp[i1++]; d"?"(Q_8n
else if(temp[i1] data[cur]=temp[i1++]; m85ZcyW1T
else O-V]I0
data[cur]=temp[i2++]; Yh1nXkA!V
} Q >[>{N&\
} KO8{eT9d
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改进后的归并排序: 'J} ?'{.
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package org.rut.util.algorithm.support; AA^K/y
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import org.rut.util.algorithm.SortUtil; M| Gl&
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/** WZ6{9/%:
* @author treeroot JW0\y+o~
* @since 2006-2-2 q7KHx b
* @version 1.0 [Lje?M* r
*/ L:Rg3eo
public class ImprovedMergeSort implements SortUtil.Sort { kJuG haO
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private static final int THRESHOLD = 10; wg)Bx#>\L:
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/* )C?H m^#
* (non-Javadoc) ej_u):G*
* #KoI8U"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;5X~"#%U_
*/ AFL'Ox]0
public void sort(int[] data) { ]>[TF'pIAx
int[] temp=new int[data.length]; l2n`fZL
mergeSort(data,temp,0,data.length-1); vS~tr sI
} t^MTR6y+8
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private void mergeSort(int[] data, int[] temp, int l, int r) { YFu,<8"swe
int i, j, k; bi}aVtG~z
int mid = (l + r) / 2; BV@q@C
if (l == r) W*S4gPGM
return; 7P3/Ky@6
if ((mid - l) >= THRESHOLD) .yfp-n4H
mergeSort(data, temp, l, mid); $s}w23nB
else :F"IOPfU5[
insertSort(data, l, mid - l + 1); <& PU%^Ha
if ((r - mid) > THRESHOLD) sS{Co8EJn
mergeSort(data, temp, mid + 1, r); ^wZx=kas
else
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insertSort(data, mid + 1, r - mid); =PA?6Bm
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for (i = l; i <= mid; i++) { p+?`ru
temp = data; pJe!~eyHm
} S+.>{0!S"
for (j = 1; j <= r - mid; j++) { ^`lD w
temp[r - j + 1] = data[j + mid]; Ig!0A}f
} EMe1!)
int a = temp[l]; a_+3, fP
int b = temp[r]; rZ(#t{]=!
for (i = l, j = r, k = l; k <= r; k++) { .zdaY,
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if (a < b) { ,S
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data[k] = temp[i++]; 6e \?%,H
a = temp; u0+F2+ I
} else { L;*7p9
data[k] = temp[j--]; %-fXa2
b = temp[j]; 36co'a4,
} {_(R?V]w,
} tH0x|
} om`B:=+
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/** RTd,bi*
* @param data -`Z!p
* @param l 1mtYap4
* @param i ^bPpcm=
*/ 2jhJXM=~
private void insertSort(int[] data, int start, int len) { NGi)Lh|
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +UOVD:G
} 4Dzg r,V
} P4yUm(@
} {ly <%Q7j
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}