归并排序: lG12Su/
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package org.rut.util.algorithm.support; }[XzM/t
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import org.rut.util.algorithm.SortUtil; {WUW.(^]G
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/** d!kiWmw,
* @author treeroot Ci6yH( RE
* @since 2006-2-2 <ABN/nH
* @version 1.0 Y)^qF)v,d
*/ @Aa$k:_
public class MergeSort implements SortUtil.Sort{ rB|Mp!g%@
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/* (non-Javadoc) YfL|FsCh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y,EReamp
*/ G0Zq:kJ
public void sort(int[] data) { U;Z6o1G
int[] temp=new int[data.length]; CqX2R:#
mergeSort(data,temp,0,data.length-1); IPmSkK
} cAq>|^f0a
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private void mergeSort(int[] data,int[] temp,int l,int r){ 'U
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int mid=(l+r)/2; 6*,'A|t?y
if(l==r) return ; dA>=#/"
mergeSort(data,temp,l,mid); Y: &?xR
mergeSort(data,temp,mid+1,r); !9=hUpRN
for(int i=l;i<=r;i++){ l'=H,8LfA
temp=data; 7[5g_D t
} L4`bGZl55
int i1=l; ~$XbYR-
int i2=mid+1; >m='#x0>Y
for(int cur=l;cur<=r;cur++){ )&:4//}a
if(i1==mid+1) DpjiE/*
data[cur]=temp[i2++]; #mg6F$E
else if(i2>r) >Ia{ZbQV
data[cur]=temp[i1++]; m[ *)sm
else if(temp[i1] data[cur]=temp[i1++]; @
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else +c4]}9f!
data[cur]=temp[i2++]; \Z9+U:n
} vQB;a?)o
} BwtjTwd
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改进后的归并排序: g a|RW0
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package org.rut.util.algorithm.support; ;u`zZb=,[
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import org.rut.util.algorithm.SortUtil; ,grdl|Dg
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/** 4i0~t~vDpr
* @author treeroot @+II@[_lT
* @since 2006-2-2 )]x/MC:9r
* @version 1.0 1SIhW:C
*/ >DX\^86x
public class ImprovedMergeSort implements SortUtil.Sort { E>|[@Z
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private static final int THRESHOLD = 10; =^ur@E
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/* 2{^k*Cfd
* (non-Javadoc) [ ySO
* p6~\U5rXm
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) } :U'aa
*/ P.^%8L
public void sort(int[] data) { #B7_5y^
int[] temp=new int[data.length]; 3LXS}~&
mergeSort(data,temp,0,data.length-1);
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} bxX[$q
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private void mergeSort(int[] data, int[] temp, int l, int r) { ^8dd
int i, j, k; %|mRib|<C
int mid = (l + r) / 2; pzcV[E1
if (l == r) lGHU{7j\
return; 7_t\wmvYp
if ((mid - l) >= THRESHOLD) L"|4
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mergeSort(data, temp, l, mid); !YD~o/t@|
else /H 3u^
insertSort(data, l, mid - l + 1); cQ kH4>C~
if ((r - mid) > THRESHOLD) CBaU$`5
mergeSort(data, temp, mid + 1, r); .48Csc-
else vY|{CBGbd
insertSort(data, mid + 1, r - mid); ,G2]3
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for (i = l; i <= mid; i++) { :4 9ttJl
temp = data; Glz)-hjJ:n
} ]Tmx;[D
for (j = 1; j <= r - mid; j++) { :N!Fe7H,
temp[r - j + 1] = data[j + mid]; Y:|_M3&'o
} D0T0Km/"
int a = temp[l]; .iK{=L/(y
int b = temp[r]; DRS68^
for (i = l, j = r, k = l; k <= r; k++) { 5I #L|+
if (a < b) { ;3ZHm*xJx
data[k] = temp[i++]; IIC1T{D}v
a = temp; cEkf9:_La
} else { EW;R^?Z
data[k] = temp[j--]; 02g!mJW>}y
b = temp[j]; =#WoeWFW*
} MUo}Qi0K
} tqI]S
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} SplEY!.k
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/** QWt?` h=
* @param data (r8Rb*OP
* @param l 63hOK
* @param i g3B
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*/ G2#={g{
private void insertSort(int[] data, int start, int len) { 5xJyW`SWz
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +T}:GBwD7
} om$x;L6
} T
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} <b 0;Nf
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}