归并排序: 8[8U49V9(
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package org.rut.util.algorithm.support; dBW#PRg
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import org.rut.util.algorithm.SortUtil; } x'o`GuUf
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/** 8EI&}I
* @author treeroot Z,b^f
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* @since 2006-2-2 a&R,jq
* @version 1.0 1+Y;
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*/ 8ZO~=e
public class MergeSort implements SortUtil.Sort{ Gv\fF;,R
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/* (non-Javadoc) lt}U,p,S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ra\|c>[%
*/ I,lzyxRP
public void sort(int[] data) { @;d7#!:cE
int[] temp=new int[data.length]; NMP*q
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mergeSort(data,temp,0,data.length-1); /bqJ6$
} "S&1J8D|
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private void mergeSort(int[] data,int[] temp,int l,int r){ nSU7,K`PM
int mid=(l+r)/2; W@FGU
if(l==r) return ; c<qJs-C4;
mergeSort(data,temp,l,mid); ^#2Y4[@
mergeSort(data,temp,mid+1,r); * km- pp
for(int i=l;i<=r;i++){ jY\YSQ
temp=data; w;^7FuBaC
} 0'*'%Iga
int i1=l; Cd7d-'EQn
int i2=mid+1; 5cl%>U
for(int cur=l;cur<=r;cur++){ UgLJV2M6
if(i1==mid+1) mHC36ba
data[cur]=temp[i2++]; GJuU?h#:/{
else if(i2>r) gr$H?|n l
data[cur]=temp[i1++]; =TXc- J
else if(temp[i1] data[cur]=temp[i1++]; kc:2ID&
else 'MIM_m)H
data[cur]=temp[i2++]; z[_Gg8e
} O<w7PS
} pJwy~ L
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} a^&3?3
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改进后的归并排序: {{_,YO^w
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package org.rut.util.algorithm.support; '
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import org.rut.util.algorithm.SortUtil; <8/lHQ^\)
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/** rx;zd ?
* @author treeroot k$} 6Qd
* @since 2006-2-2 ZsYT&P2
* @version 1.0 x68s$H
*/ ~#
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public class ImprovedMergeSort implements SortUtil.Sort { /d-7n|#E
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private static final int THRESHOLD = 10; rk(0w|zR+
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/* >pA9'KWs]
* (non-Javadoc)
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* "A9 c]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) cb~m==G
*/ \>-%OcYlM
public void sort(int[] data) { U
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int[] temp=new int[data.length]; mCx6$jz
mergeSort(data,temp,0,data.length-1); Ok~\
} zHCz[jlrMq
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private void mergeSort(int[] data, int[] temp, int l, int r) { (wIpq<%
int i, j, k; [HENk34
int mid = (l + r) / 2; uJ$!lyJ6L
if (l == r) NASRr
return; )Hy|K1
if ((mid - l) >= THRESHOLD) z '%Vy
mergeSort(data, temp, l, mid); ?5 d3k%
else 5 ERycC y
insertSort(data, l, mid - l + 1); ?Yp: h
if ((r - mid) > THRESHOLD) }mC-SC)oSi
mergeSort(data, temp, mid + 1, r); -gV'z5
else W;C41>^?/
insertSort(data, mid + 1, r - mid); `4 A%BKYB
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for (i = l; i <= mid; i++) { ),)]gw71QW
temp = data; [e'Ts#($A
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for (j = 1; j <= r - mid; j++) { w#,C{6
temp[r - j + 1] = data[j + mid]; rB:W\5~7
} b
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int a = temp[l]; *^u5?{$l(
int b = temp[r]; Kq;Yb&
for (i = l, j = r, k = l; k <= r; k++) { FiqcM-Af4
if (a < b) { R{hKl#j;>
data[k] = temp[i++]; SpY%2Y.Dy
a = temp; iB 5 Se
} else { # -Ts]4v
data[k] = temp[j--]; UpS`KgF"v
b = temp[j]; MLcc
} ( Qw"^lE3
} $9\!CPZ2
} ;HJ|)PN5L
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/** u#Qd`@p
* @param data Ro?aDrQ
* @param l b#^UP
* @param i ;,]T|>M
*/ jxr~cp?4
private void insertSort(int[] data, int start, int len) { i4N'[ P}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); dg4 QA_"
} :-
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} _S#uxgL<
} }4kd=]Nk
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}