归并排序: g_z%L?N
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package org.rut.util.algorithm.support; g70B22!y
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import org.rut.util.algorithm.SortUtil; "b&[W$e
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/** K07b#`NF6
* @author treeroot rzC\8Dd
* @since 2006-2-2 V+7x_>!&)
* @version 1.0 GC(:}e |
*/ |G.|ocj;
public class MergeSort implements SortUtil.Sort{ BElVkb
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/* (non-Javadoc) yLfb'Ba
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P]*,955*)
*/ bYT,f.,5{
public void sort(int[] data) { }K\]M@
int[] temp=new int[data.length]; UR')) 1n
mergeSort(data,temp,0,data.length-1); h+o-h4X
} s53Pw>f
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private void mergeSort(int[] data,int[] temp,int l,int r){ >"qnuv G
int mid=(l+r)/2; R
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if(l==r) return ; <uXZ*E
mergeSort(data,temp,l,mid); cPcp@Dp
mergeSort(data,temp,mid+1,r); =n_r\z
for(int i=l;i<=r;i++){ #Z8=z*4
temp=data; o#V}l^uU=
} Gni<@;}
int i1=l; d`>'<
int i2=mid+1; D$|@:
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for(int cur=l;cur<=r;cur++){ aiP.\`>}
if(i1==mid+1) 5c?1JH62o8
data[cur]=temp[i2++]; $5XE'm
else if(i2>r) >3R)&N
data[cur]=temp[i1++]; , VT&
else if(temp[i1] data[cur]=temp[i1++]; h$`P|#V&
else -nP
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data[cur]=temp[i2++]; 0zD[mt
} 5 rpX"(
} $RxS<_tj
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改进后的归并排序: 29R_?HBH
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package org.rut.util.algorithm.support; 92|\`\LP%
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import org.rut.util.algorithm.SortUtil; sJ{S(wpi"
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/** 3 ZO\Pu
* @author treeroot `Pa z
* @since 2006-2-2 j2A
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* @version 1.0 4+fWIY1
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*/ nH*JR
public class ImprovedMergeSort implements SortUtil.Sort { L;d(|7BVv
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private static final int THRESHOLD = 10; Ke0j8|
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/* K.k%Tg[ ~
* (non-Javadoc) 9r,)Bw!RP
* r(g:b
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %fY\vd2
*/ Y.9s-g
public void sort(int[] data) { 7`113`1
int[] temp=new int[data.length]; R-Y07A
mergeSort(data,temp,0,data.length-1); oWg"f*
} {C6,h#|pg
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private void mergeSort(int[] data, int[] temp, int l, int r) { xY]Y
int i, j, k; J&mZsa)4
int mid = (l + r) / 2; [
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if (l == r) QDO.&G2
return; d\% |!ix
if ((mid - l) >= THRESHOLD) <Co\?h/<
mergeSort(data, temp, l, mid); )$[.XKoT
else [I*zZ`
insertSort(data, l, mid - l + 1); ifyWhS++
if ((r - mid) > THRESHOLD) HE>6A|rgDr
mergeSort(data, temp, mid + 1, r); q~QB?+ x&
else xaQO=[
insertSort(data, mid + 1, r - mid); 0E[&:6#Y
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for (i = l; i <= mid; i++) { >)E{Hs
temp = data; Npq_1L
} RM/q\100
for (j = 1; j <= r - mid; j++) { @3T)J,f
temp[r - j + 1] = data[j + mid]; vwA d6Tm
} tGq0f"}'J
int a = temp[l]; lOk'stLNa&
int b = temp[r]; PNNY_t +I
for (i = l, j = r, k = l; k <= r; k++) { ^*!Tq&Dst|
if (a < b) { eiTG
data[k] = temp[i++]; $CT2E
a = temp; QLr.5Wcg>
} else { AXK6AZjX
data[k] = temp[j--]; 14U:.Q
b = temp[j]; P*9vs %W
} Jat|n97$
} 'Ipp1a
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} ",9QqgY+
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/** Szz:$!t
* @param data <$ H-/~Y
* @param l X,+M?
* @param i HN7C+e4U~
*/ X:3W9`s)*
private void insertSort(int[] data, int start, int len) { =\[}@Kh
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); -SF*DZ
} ~57.0?IK
} J0%e6{C1
} #* KmPc+
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}