归并排序: (9lx5
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package org.rut.util.algorithm.support; tAn6pGp
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import org.rut.util.algorithm.SortUtil; QxL
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/** L*Cf&c`8r
* @author treeroot qf {B
* @since 2006-2-2 Z-V%lRQ=b
* @version 1.0 LR.+CxQ
*/ u 9TlXn
public class MergeSort implements SortUtil.Sort{ #.xTAvD
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/* (non-Javadoc) b,sc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )x s,
*/ nlnJJM&J$
public void sort(int[] data) { M- A}(r +J
int[] temp=new int[data.length]; 55en
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mergeSort(data,temp,0,data.length-1); =&xoyF
} <08 V-
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private void mergeSort(int[] data,int[] temp,int l,int r){ S,>n'r[
int mid=(l+r)/2; ''YjeX
if(l==r) return ; (!=aRC.-
mergeSort(data,temp,l,mid); -JQg{A
mergeSort(data,temp,mid+1,r); +Enff0 =+
for(int i=l;i<=r;i++){ Bbp9Q,4
temp=data; bS"M*
} {NDe9V5
int i1=l; h0pr"]sO;$
int i2=mid+1; S?tLIi/
for(int cur=l;cur<=r;cur++){ Ku'U^=bVm:
if(i1==mid+1) Wuz~$SU
data[cur]=temp[i2++]; 8hA=$}y&x
else if(i2>r) ApBThW*E
data[cur]=temp[i1++]; ?V)6`St#C
else if(temp[i1] data[cur]=temp[i1++]; k,(_R=
else 2"^9t1C2
data[cur]=temp[i2++]; k"c_x*f
} F4{<;4N0
} pP&M]'
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改进后的归并排序: Puh&F< B
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package org.rut.util.algorithm.support; u{z{3fW_
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import org.rut.util.algorithm.SortUtil; oPBjsQ
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/** '& :"/4@)
* @author treeroot gV;GC{pY
* @since 2006-2-2 '+wTrW m~j
* @version 1.0 bc-)y3gHU
*/ }5Uf`pM8
public class ImprovedMergeSort implements SortUtil.Sort { 6Fb~`J~s
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private static final int THRESHOLD = 10; *@^0xz{\z
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/* TQH#sx
* (non-Javadoc) +Eg# 8/q
* *
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P!EX;+7+x
*/ g7-K62bb
public void sort(int[] data) { ^Quy64M
int[] temp=new int[data.length]; RJD3o_("K
mergeSort(data,temp,0,data.length-1); '~0&m]N
} 2D"/k'iA
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private void mergeSort(int[] data, int[] temp, int l, int r) { nt6"}vO
int i, j, k; @d|9(,Q
int mid = (l + r) / 2; Q!v[b{]8
if (l == r) sn%fE
return; kF .b)
if ((mid - l) >= THRESHOLD) dPId=
w)
mergeSort(data, temp, l, mid); :Ib\v88WIv
else 0b'R5I.M
insertSort(data, l, mid - l + 1); t,_[nu(~8%
if ((r - mid) > THRESHOLD) r.5F^
mergeSort(data, temp, mid + 1, r); VXS9E383
else 1,,-R*x
insertSort(data, mid + 1, r - mid); =UY@,*q:c
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for (i = l; i <= mid; i++) { yM@cml6Ox
temp = data; mr? ii
} \mloR
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for (j = 1; j <= r - mid; j++) { '>BHwc
temp[r - j + 1] = data[j + mid];
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} v]~[~\|a
int a = temp[l]; ;Lu|fQ#u*
int b = temp[r]; @$]h[
for (i = l, j = r, k = l; k <= r; k++) { S8l+WF4q
if (a < b) { f`e.c_n(
data[k] = temp[i++]; Tx_LH"8
a = temp; 7Z_iQ1
} else { )SuJK.IF
data[k] = temp[j--]; 3]acfCacC
b = temp[j]; VbjW$?
} p
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} .anL}OA_q
} uHYI :(O
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/** wlJ1,)n^2
* @param data #A!0KN;GC2
* @param l cf9y0
* @param i {;U:0BPI3
*/ Nsq%b?#
private void insertSort(int[] data, int start, int len) { =[kv@p
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); UuGv= yC^6
} ^&By