归并排序: .w0s%T,8}^
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package org.rut.util.algorithm.support; ly:q6i
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import org.rut.util.algorithm.SortUtil; I~ok4L?VB
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/** tD+9kf2
* @author treeroot =zKhz8B(
* @since 2006-2-2 ApAO/q
* @version 1.0 1(|'WyD
*/ 1`a5C.v
public class MergeSort implements SortUtil.Sort{ C!fMW+C@
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/* (non-Javadoc) /7}It$|nhy
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) paKSr|O
*/ fpFhn
public void sort(int[] data) { R)mu2^
int[] temp=new int[data.length]; hRK/T7v
mergeSort(data,temp,0,data.length-1); 1+}{8D_F
} 8C67{^`::
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private void mergeSort(int[] data,int[] temp,int l,int r){ vTJ}8
int mid=(l+r)/2; ~])t 6i
if(l==r) return ; @Ub"5Fl4
mergeSort(data,temp,l,mid); 80Gn%1A9
mergeSort(data,temp,mid+1,r); g7OqX \
for(int i=l;i<=r;i++){ gK[YQXfTy
temp=data; px}|Mu7z~
} >_|O1H./4
int i1=l; ][?G/*k
int i2=mid+1; Ry%Mej:
for(int cur=l;cur<=r;cur++){ .6`9H 1
if(i1==mid+1) @wE5S6! B\
data[cur]=temp[i2++]; (X?%^^e!
else if(i2>r) 4cl\^yD
data[cur]=temp[i1++]; 0@H|n^Md#
else if(temp[i1] data[cur]=temp[i1++]; &NH$nY.r
else NiU2@zgl
data[cur]=temp[i2++]; ]%?YZn<{
} G>1eFBh }
} FW/W%^
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} ]
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改进后的归并排序: *# tJM.Z
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package org.rut.util.algorithm.support; <N_+=_
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import org.rut.util.algorithm.SortUtil; W9D86]3Y
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/** E )5E$
* @author treeroot A-T]9f9
* @since 2006-2-2 2JJ"O|Ibz
* @version 1.0 V3c l~
*/ ]>~)<
public class ImprovedMergeSort implements SortUtil.Sort { @8;W \L$~1
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private static final int THRESHOLD = 10; Hhari!RXC
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/* <iH`rP#
* (non-Javadoc) &Nczv"TM
* 2\7`/,U6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rzh#CnL3
*/ pO ml8SQf
public void sort(int[] data) { ]y,==1To
int[] temp=new int[data.length]; rld67'KcE
mergeSort(data,temp,0,data.length-1); `eIenA
} rmE" rf
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private void mergeSort(int[] data, int[] temp, int l, int r) { 11<KpxKpk
int i, j, k; Bh=u|8yxc
int mid = (l + r) / 2; -lhLA`6_R
if (l == r) nIU 6h
return; BbgnqzU
if ((mid - l) >= THRESHOLD) 1#0{@35
mergeSort(data, temp, l, mid); ZE2$I^DY-
else 0IfKJ*]M
insertSort(data, l, mid - l + 1); XI22+@d6
if ((r - mid) > THRESHOLD) IFDZfx
mergeSort(data, temp, mid + 1, r);
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else *T~Ve;3h;
insertSort(data, mid + 1, r - mid); ub;ZtsM,%
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for (i = l; i <= mid; i++) { $ep.-I>
temp = data; {|1Y:&M?
} .8y3O]
for (j = 1; j <= r - mid; j++) { lsy?Ac
temp[r - j + 1] = data[j + mid]; GQ9\'z#+
} 1$%V{4bJ
int a = temp[l]; Ee3hG2d`
int b = temp[r]; op6CA "w
for (i = l, j = r, k = l; k <= r; k++) { 1. rj'
if (a < b) { @ ]/AjjLt
data[k] = temp[i++]; %Mk0QKzUo
a = temp; /ew
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} else { }w1~K'ck}>
data[k] = temp[j--]; H
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b = temp[j]; OujCb^Rm
} 'rr^2d]`ST
} il \$@Bn
} p~9vP)74u
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/** D;_ MPN[
* @param data G=A,9@+c
* @param l T`Mf]s)*
* @param i -mRA#
*/ ,;(PwJe
private void insertSort(int[] data, int start, int len) { pGK;1gVj
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ~R&;v3
} <_XWWT%
} ^",ACWF4Sk
} |j VM&R2s
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}