归并排序: +J4t0x
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package org.rut.util.algorithm.support; 4dK@UN\
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import org.rut.util.algorithm.SortUtil; ]
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/** v8IL[g6"
* @author treeroot S_CtEM
* @since 2006-2-2 vSA%A47G
* @version 1.0 FTfA\/tl(;
*/ /fq6-;co+
public class MergeSort implements SortUtil.Sort{ PS22$_}
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/* (non-Javadoc) M5V1j(URE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g3XAs@
*/ !%X`c94
public void sort(int[] data) { D+3Y.r9
int[] temp=new int[data.length]; z Y|g#V-
mergeSort(data,temp,0,data.length-1); "p{'984r<
} ;Z_C3/b
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private void mergeSort(int[] data,int[] temp,int l,int r){ \PONaRK|[z
int mid=(l+r)/2; @^%_ir(
if(l==r) return ; ka3Z5
mergeSort(data,temp,l,mid); lRr-S%
mergeSort(data,temp,mid+1,r); KIFx&A
for(int i=l;i<=r;i++){ ]EnaZWyO]
temp=data; w0!,1
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} hI8C XG
int i1=l; /<$"c"UQ
int i2=mid+1; d"UW38K{
for(int cur=l;cur<=r;cur++){ ,Tl5@RN
if(i1==mid+1) kU/=Du
data[cur]=temp[i2++]; U;GoC$b}|
else if(i2>r) ~a%hRJg
data[cur]=temp[i1++];
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else if(temp[i1] data[cur]=temp[i1++]; q4iD59yd)S
else g4~qcI=a
data[cur]=temp[i2++]; ..!-)q'?
} X^5"7phI@
} &'b}N
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} `Qf
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改进后的归并排序: R
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package org.rut.util.algorithm.support; 3{:<z4>{
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import org.rut.util.algorithm.SortUtil; ON0+:`3\
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/** *v ^"4
* @author treeroot v|(b,J3
* @since 2006-2-2 O + &
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* @version 1.0 -3tBN*0+
*/ Rl4zTAI
public class ImprovedMergeSort implements SortUtil.Sort { OX/.v?c
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private static final int THRESHOLD = 10; JvL'gJ$70
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/* q{/Jw"e
* (non-Javadoc) 5Y=\~,%\oH
* Gc!8v}[7J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <]^;/2.B
*/ :V~*vLvR
public void sort(int[] data) { 6.s?
int[] temp=new int[data.length]; !muYn-4M
mergeSort(data,temp,0,data.length-1); uyt-q|83=
} :wZ`>,K"t>
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private void mergeSort(int[] data, int[] temp, int l, int r) { .Pes{uHg
int i, j, k; ;sR6dT)
int mid = (l + r) / 2; ?_>^<1I1
if (l == r) |QOJ9~hxD
return; E ' JC
if ((mid - l) >= THRESHOLD) ?s)sPM?
mergeSort(data, temp, l, mid); 1`]IU_) 1B
else <-:@} |br
insertSort(data, l, mid - l + 1); u?;Vxh3@|
if ((r - mid) > THRESHOLD) !5%5]9'n@*
mergeSort(data, temp, mid + 1, r); asN
}
else }FiN 7#
insertSort(data, mid + 1, r - mid); #7-@k-<|
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for (i = l; i <= mid; i++) { C'czXZtn
temp = data; p_qm}zp
} :LiDJF
for (j = 1; j <= r - mid; j++) { ]p&< nK,
temp[r - j + 1] = data[j + mid]; Jrd4a~XP
} prEu9$:t
int a = temp[l]; rk,1am:cg
int b = temp[r]; g~c|~u(W
for (i = l, j = r, k = l; k <= r; k++) { uy _i{Y|
if (a < b) { VNrO(j DUv
data[k] = temp[i++]; rgdQR^!l6
a = temp; cYM~IA
} else { U+PCvl=x
data[k] = temp[j--]; #C1A5JE&
b = temp[j]; ,r 2VP\hLh
} k5t^s
} )s<WG}
} #} ~p^ 0
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/** ,0uo&/Y4L
* @param data 4^[}]'w
* @param l RmWfV
* @param i A!W"*WT
*/ fb"J Bc}X
private void insertSort(int[] data, int start, int len) { {jM<t
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); "bR'Bt
} g"]<J&
}
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} '"w}gx
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}