归并排序: vW.%[]
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package org.rut.util.algorithm.support; Wb=Jj 9;
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import org.rut.util.algorithm.SortUtil; 993d/z|DX
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/** GXb47_b^
* @author treeroot V> a*3D
* @since 2006-2-2 *M!kA65'
* @version 1.0 =mrY/:V
*/ ,zgNE*{Y"4
public class MergeSort implements SortUtil.Sort{ jW5iqU"{*
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/* (non-Javadoc) j8HOc(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) WEa>)@
*/ 2:J,2=%
public void sort(int[] data) { <Ry$7t,
int[] temp=new int[data.length]; Tx+ p8J|Yr
mergeSort(data,temp,0,data.length-1); 4]6 Qr
} CM 9P"-
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private void mergeSort(int[] data,int[] temp,int l,int r){ :::>ro*R
int mid=(l+r)/2; d7~j^v)=^
if(l==r) return ; /_OOPt=G
mergeSort(data,temp,l,mid); {'IFWD. 5
mergeSort(data,temp,mid+1,r); N#Ag'i4HF
for(int i=l;i<=r;i++){ ]V<"(?,K
temp=data; yisLypM*
} b[g.}'^yht
int i1=l; T'R,vxP)\
int i2=mid+1; ^gm>!-Gx
for(int cur=l;cur<=r;cur++){ h*'d;_(,
if(i1==mid+1) ~PYFYjHC
data[cur]=temp[i2++]; + zDc
else if(i2>r) ;f(n.i
data[cur]=temp[i1++]; ('BLU.7IX
else if(temp[i1] data[cur]=temp[i1++]; `cO|RhD@
else <3Fz>}V32
data[cur]=temp[i2++]; Qu}N:P9l?X
} #NJ<[Gew
} ?waebuj>
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改进后的归并排序: BvI 0v:
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package org.rut.util.algorithm.support; fM9xy \.
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import org.rut.util.algorithm.SortUtil; {r{>?)O
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/** @SQceQfB
* @author treeroot a|z1K
* @since 2006-2-2 9@etg4#]
* @version 1.0 ]0YDb~UB
*/ Cn/q=
public class ImprovedMergeSort implements SortUtil.Sort { (-'PD_|
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private static final int THRESHOLD = 10; 'v+96b/;
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/* m>O2t-
* (non-Javadoc) p`LL
* }Oh5Nm)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ 1V\1]J/
public void sort(int[] data) { v'$ykZ!Z
int[] temp=new int[data.length]; Pd,!&
mergeSort(data,temp,0,data.length-1); tB!|p 6
} T5V$wmB\W
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private void mergeSort(int[] data, int[] temp, int l, int r) { @NBXyC8,Z
int i, j, k; >LCjtm\
int mid = (l + r) / 2; w[|y0jtw
if (l == r) vevx|<9,
return; 83X/"2-K
if ((mid - l) >= THRESHOLD) bf{Ep=-
mergeSort(data, temp, l, mid); mxZ4
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else lej^gxj/2
insertSort(data, l, mid - l + 1); vDWr|M%``l
if ((r - mid) > THRESHOLD) QZz&1n
mergeSort(data, temp, mid + 1, r); x9TuweG
else ;\1b{-' l
insertSort(data, mid + 1, r - mid); zabw!@]
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for (i = l; i <= mid; i++) { ))$ CEh"X
temp = data; *:k~g].Iz
} ;%M2x5
for (j = 1; j <= r - mid; j++) { uTxX`vH@!
temp[r - j + 1] = data[j + mid]; D~XU`;~u
} EC0zH#N
int a = temp[l]; {P,>Q4N
int b = temp[r]; u87=q^$
for (i = l, j = r, k = l; k <= r; k++) { p^}L
if (a < b) { se}pdL}
data[k] = temp[i++]; `NTM%# w
a = temp; &%@/Dwr
} else { }3LBbG0Bw
data[k] = temp[j--]; wA{*W>i
b = temp[j]; !^n1
} tuX =o
} 5+o
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} S5zpUF=
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/** p`shYyE
* @param data [P (rY
* @param l 3Pw%[q=g
* @param i
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*/ }(8D!XgWa
private void insertSort(int[] data, int start, int len) { U&