归并排序: 8::y5Yv]
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package org.rut.util.algorithm.support; Mg8ciV}\xY
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import org.rut.util.algorithm.SortUtil; ]{{%d4
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/** MZA%ET,l,<
* @author treeroot Y:Lkh>S1Q
* @since 2006-2-2 *>W6,F7
* @version 1.0 \}=W*xxB
*/ fMW=ss^fu-
public class MergeSort implements SortUtil.Sort{ d_Zj W
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/* (non-Javadoc) 1g,gilc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9PO5GYU
*/ 4XJ']M(5;
public void sort(int[] data) { G\k&sF
int[] temp=new int[data.length]; KMfRMc&
mergeSort(data,temp,0,data.length-1); o@j!J I&
} =Ov,7<8o
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private void mergeSort(int[] data,int[] temp,int l,int r){ ~=HPqe8
int mid=(l+r)/2; {(F}SF{
if(l==r) return ; Vi'7m3&
mergeSort(data,temp,l,mid); uV}GUE%W
mergeSort(data,temp,mid+1,r); eej#14&
for(int i=l;i<=r;i++){ l$l6,OzS@
temp=data; g2LvojR
} wkPomTO
int i1=l; +@8, uL
int i2=mid+1; I3x+pa^]2
for(int cur=l;cur<=r;cur++){ /L!
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if(i1==mid+1) "iK'O =M
data[cur]=temp[i2++]; 0lYP!\J3]%
else if(i2>r) |rhB@k
data[cur]=temp[i1++]; i^ILo,Q
else if(temp[i1] data[cur]=temp[i1++]; &,l7w K
else )M[FPJP}
data[cur]=temp[i2++]; 9T`YHA'g
} zI(uexxPqd
} Ly
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改进后的归并排序: - \ew,y
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package org.rut.util.algorithm.support; h.- o$+Sa
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import org.rut.util.algorithm.SortUtil; r"x}=# b!
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/** e(DuJ-
* @author treeroot 0s}gg[lj
* @since 2006-2-2 {ynI]Wj`L
* @version 1.0 v6x jLP;O
*/ 33hP/p%
public class ImprovedMergeSort implements SortUtil.Sort { m#6p=E
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private static final int THRESHOLD = 10; yC|odX#
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/* UA0(
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* (non-Javadoc) B*QLKO:)i
* o(3OChH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LT,zk)5
*/ { M[iYFg=
public void sort(int[] data) { B4m34)EOE
int[] temp=new int[data.length]; =PjdL32
mergeSort(data,temp,0,data.length-1); >%t5j?p
} i8R2Y9Q*O
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private void mergeSort(int[] data, int[] temp, int l, int r) { Nlc3S+$`z
int i, j, k; =G'J@[d{d
int mid = (l + r) / 2; `VglE?M
if (l == r) G(hnrRxn
return; #xhl@=W;
if ((mid - l) >= THRESHOLD) ;'<SsI
mergeSort(data, temp, l, mid); t`V U<
else EzCi%>q
insertSort(data, l, mid - l + 1); YsTF10
if ((r - mid) > THRESHOLD) Ac
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mergeSort(data, temp, mid + 1, r); QNj6ETB-d
else sN1I+X
insertSort(data, mid + 1, r - mid); poi39B/Vt
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for (i = l; i <= mid; i++) { hrfSe $8
temp = data; &&96kg3
} '0qKb*
for (j = 1; j <= r - mid; j++) { S^i<_?nwg
temp[r - j + 1] = data[j + mid]; v:9Vp{)
} MP
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int a = temp[l]; LN'})CI8m
int b = temp[r]; WO+>W+|N
for (i = l, j = r, k = l; k <= r; k++) { (|y@ftr@
if (a < b) { `n e9&+
data[k] = temp[i++]; 0{Zwg0&
a = temp; de"+ABR
} else { 86Xf6Ea
data[k] = temp[j--];
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b = temp[j]; ?V)M!
} dda*gq/p
} yfAh=
} h61BIc@>
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/** GM@0$
* @param data ;|Rrtf9
* @param l ?SoRi</1
* @param i hBW,J$B
*/ p;2NO&
private void insertSort(int[] data, int start, int len) { emS7q|^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); >~G _'~_f
} %i.;~>
} \e?w8R.6w^
} G`u";w_
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}