归并排序: \. YJs"<3
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package org.rut.util.algorithm.support; v9"03=h
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import org.rut.util.algorithm.SortUtil; /_r` A
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/** rPK 1#
* @author treeroot #6@4c5{2=4
* @since 2006-2-2 ,L\>mGw
* @version 1.0 10CRgrZ
*/
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public class MergeSort implements SortUtil.Sort{ ('+C $
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/* (non-Javadoc) )i<Qg.@MX
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) w d6+,B
*/ byPqPSY
public void sort(int[] data) { 814cCrr,o
int[] temp=new int[data.length]; "EnxVV
mergeSort(data,temp,0,data.length-1); T@d4NF#
} U% OlYP$g
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private void mergeSort(int[] data,int[] temp,int l,int r){ -nY_.fp>
int mid=(l+r)/2; hVh,\d&2t
if(l==r) return ; A'n{K#
mergeSort(data,temp,l,mid); !-4VGt&c,
mergeSort(data,temp,mid+1,r); E.G]T#wt0
for(int i=l;i<=r;i++){ Va^(cnwa
temp=data; hbm#H7Y
} M/kBAxNIC|
int i1=l; _Zus4&'
int i2=mid+1; V`}u:t7r
for(int cur=l;cur<=r;cur++){ bycnh
if(i1==mid+1) \"b'Z2g
data[cur]=temp[i2++]; JtxitF2
else if(i2>r) bT`et*]
data[cur]=temp[i1++]; ohi0_mBz
else if(temp[i1] data[cur]=temp[i1++];
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else "Iacs s0;
data[cur]=temp[i2++]; 04:QEC"9mj
} lS?#(}a1)
}
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改进后的归并排序: fDAT#nlyp
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package org.rut.util.algorithm.support; >XW-W
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import org.rut.util.algorithm.SortUtil; Mg&<W#$K
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/** UQjYWXvi
* @author treeroot b1yS1i
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* @since 2006-2-2 0@RVM|
* @version 1.0 x M{SFF
*/ p,14'HS%@
public class ImprovedMergeSort implements SortUtil.Sort { e^UUR-K%
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private static final int THRESHOLD = 10; Qe`Nb4xf
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/* A@e!~
* (non-Javadoc) wpt5'|I
*
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7Ac.^rv5
*/ |][PbN
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public void sort(int[] data) { kArF Gb2c
int[] temp=new int[data.length]; -/_hO$|W
mergeSort(data,temp,0,data.length-1); @XVx{t;g2
} bVr`a*EM
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private void mergeSort(int[] data, int[] temp, int l, int r) { @eYD@!
int i, j, k; +ZkJ{r0,(
int mid = (l + r) / 2; C|]Zpn#{K
if (l == r) n>,? V3ly
return; ?8)k6:
if ((mid - l) >= THRESHOLD) 'l3 DP
mergeSort(data, temp, l, mid); HcpAp]L)
else P`y.3aK
insertSort(data, l, mid - l + 1); KBA&s
if ((r - mid) > THRESHOLD) K{XE|g
mergeSort(data, temp, mid + 1, r); RtEx
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else ;aH3{TS
insertSort(data, mid + 1, r - mid); +9M";'\c
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for (i = l; i <= mid; i++) { ktM7L{Nz
temp = data; A2.4#Qb'
} Q)5V3Q]@^
for (j = 1; j <= r - mid; j++) { Yw\lNhoPS
temp[r - j + 1] = data[j + mid]; Ac\e>N
} 4W=fQx]
int a = temp[l]; H%{k.#O
int b = temp[r];
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for (i = l, j = r, k = l; k <= r; k++) { '@1C$0tx
if (a < b) { z~/e\
data[k] = temp[i++]; }4?z<. V
a = temp; [4+I1UR`
} else { \T?6TDZ]
data[k] = temp[j--]; m@YK8c#$
b = temp[j]; [{zfI`6
} H% FP!03
} Q~` {^fo1
} 4r#4h4`y|
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/** 2_TFc2d
* @param data }-
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* @param l RQ4+EW1G
* @param i mdlMciP
*/ "d2JNFIHb
private void insertSort(int[] data, int start, int len) { 83VFBY2q
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); #VsS C1
} z6|kEc"{
} 6_K7!?YG7
} H(Y 1%@
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}