归并排序: pdcwq~4~%
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package org.rut.util.algorithm.support; I 1VEm?CQ
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import org.rut.util.algorithm.SortUtil; +qSr=Y:+
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/** HhY2`P8
* @author treeroot ]` &[Se d
* @since 2006-2-2 #BT6bH08X
* @version 1.0 die2<'\4%
*/ iuU3*yyn
public class MergeSort implements SortUtil.Sort{ 23u1nU[0
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/* (non-Javadoc) MLv.v&@S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 13>3R+o
*/ H>X>5_{}
public void sort(int[] data) { $E9daUt8"J
int[] temp=new int[data.length]; Y=WN4w
mergeSort(data,temp,0,data.length-1); 2t`9_zqLw
} (zTI)EV
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private void mergeSort(int[] data,int[] temp,int l,int r){ x}8T[
int mid=(l+r)/2; jO3u]5}.6
if(l==r) return ; BqEubP(si
mergeSort(data,temp,l,mid); X5oW[
mergeSort(data,temp,mid+1,r); UN
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for(int i=l;i<=r;i++){ !Bd*
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temp=data; ^s(X VVA
} 1~xn[acy
int i1=l; o|*|
int i2=mid+1; |<Dx
for(int cur=l;cur<=r;cur++){ )zLS,/pk^
if(i1==mid+1) MCrO]N($b
data[cur]=temp[i2++]; Sc"4%L
else if(i2>r) k4AE`[UE
data[cur]=temp[i1++]; Qpv}N*v^
else if(temp[i1] data[cur]=temp[i1++]; Q"K >ML>0
else \|>`z,;
data[cur]=temp[i2++]; *ZSp9g"Z
} 1PTu3o&3
} gc8PA_bFz
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改进后的归并排序: 6RT0\^X*:
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package org.rut.util.algorithm.support; c'Tu,-
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import org.rut.util.algorithm.SortUtil; hy&Hl
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/** 8W<)c
* @author treeroot llG#nDe
* @since 2006-2-2 >=W#z
* @version 1.0 tD0>(41K
*/ /,@v"mE7c!
public class ImprovedMergeSort implements SortUtil.Sort { Yg,WdVI&@
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private static final int THRESHOLD = 10; ~$ qJw?r
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/* ~S_IU">E
* (non-Javadoc) H|:)K^o
* lgqL)^8A
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) w~KBk)!*
*/ l5OV!<7~X
public void sort(int[] data) { v*fc5"3eO
int[] temp=new int[data.length]; c%Cae3;
mergeSort(data,temp,0,data.length-1);
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} qe"6#@b *|
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private void mergeSort(int[] data, int[] temp, int l, int r) { V>uW|6
int i, j, k; FRQ("6(
int mid = (l + r) / 2; E1ob+h:`d
if (l == r) aq \TO?
return; )hJjVitG
if ((mid - l) >= THRESHOLD) SVWSO
mergeSort(data, temp, l, mid); yx;R#8;b.
else >8;%F<o2
insertSort(data, l, mid - l + 1); `[:1!I.}-
if ((r - mid) > THRESHOLD) 8PjhvU
mergeSort(data, temp, mid + 1, r); 9l_?n@
else vk+%#w
insertSort(data, mid + 1, r - mid); [Q_|6Di
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for (i = l; i <= mid; i++) { Yn2^nT=8
temp = data; A?k,}~
} #&KE_n
for (j = 1; j <= r - mid; j++) { J7^T!7V.
temp[r - j + 1] = data[j + mid]; #( J}xz;
} ~EkGG
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int a = temp[l]; j=% -b]
int b = temp[r]; cD@lorj
for (i = l, j = r, k = l; k <= r; k++) { V*uu:
if (a < b) { <
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data[k] = temp[i++]; Dx*oSP.qX
a = temp; *t9qH
} else { ,k' 6<Hw
data[k] = temp[j--]; ,,wx197XeD
b = temp[j]; bO%ck-om!
} vbh#[,lh
} Cy'W!qH
} >Nl~"J|]q
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/** Eakjsk
* @param data sn`?Foh
* @param l -vAG5x/ ,
* @param i Jn&>Z? @
*/ _'dy$.g
private void insertSort(int[] data, int start, int len) { 8Kkr1}!wd
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); sswAI|6ou
} 2dW-WHaM
} *.Hnt\4|
} oioN0EuDk
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}