归并排序: 0RF<:9@x2
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package org.rut.util.algorithm.support; G\C>fwrP_
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import org.rut.util.algorithm.SortUtil; AVO$R\1YR
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/** fX/k;0l
* @author treeroot QI4a@WB]ok
* @since 2006-2-2 NOQSL T=
* @version 1.0 2PViY,V|
*/ yP "D~u
public class MergeSort implements SortUtil.Sort{ ./_4D}
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/* (non-Javadoc) OV`#/QL
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) UNCI"Mjb
*/ XQStlUw8+
public void sort(int[] data) { t@cImmh\T
int[] temp=new int[data.length]; D.,~I^W
mergeSort(data,temp,0,data.length-1); YPmgR]=6
} (i@B+c
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private void mergeSort(int[] data,int[] temp,int l,int r){ t}fU 2Yb
int mid=(l+r)/2; dhe?7r]u
if(l==r) return ; P5;LM9W
mergeSort(data,temp,l,mid); |irqv< r
mergeSort(data,temp,mid+1,r); -GkNA"2M[
for(int i=l;i<=r;i++){ ~L!*p0dS^
temp=data; 7@g8nv(p
} V/Hjd`n)`i
int i1=l; 'hl>pso.
int i2=mid+1; )u7*YlU\I
for(int cur=l;cur<=r;cur++){ [@ ]f@Wd
if(i1==mid+1) _A*5BAB:h(
data[cur]=temp[i2++]; jB]tq2i
else if(i2>r) :sRV]!Iw
data[cur]=temp[i1++]; W1X\!Y
else if(temp[i1] data[cur]=temp[i1++]; G| pZ
else T>(nc" (
data[cur]=temp[i2++]; `d#l o
} F]~ rA! g1
} x^aqnKoJ%\
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} **rA/*Oc
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改进后的归并排序: .BGM1ph}~
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package org.rut.util.algorithm.support; ^(I4Do~}
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import org.rut.util.algorithm.SortUtil; P&3'N~k-
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/** ~U&,hFSPY
* @author treeroot &6A'}9Ch
* @since 2006-2-2 3kFOs$3
* @version 1.0 7s_#X|A$
*/ &H!3]
public class ImprovedMergeSort implements SortUtil.Sort { [B9'/:
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private static final int THRESHOLD = 10; "}UJ~ j).
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/* bkkhx,Oi[G
* (non-Javadoc) |w2H5f{fR
* gnmKh>0@6o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) EWPP&(u3
*/ '~i}2e.
public void sort(int[] data) { wZVY h
int[] temp=new int[data.length]; P0J3ci}^
mergeSort(data,temp,0,data.length-1); HlqvXt\
} Ktg{-Xl
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private void mergeSort(int[] data, int[] temp, int l, int r) { >N>WOLbb7(
int i, j, k; 9l2,:EQ*
int mid = (l + r) / 2; &^e%gU8!\
if (l == r) I*R[8|
return; $X_JUzb
if ((mid - l) >= THRESHOLD) @-bX[}.
mergeSort(data, temp, l, mid); _^Lv8a3(O
else ][-N<
insertSort(data, l, mid - l + 1); jC1mui|Y^
if ((r - mid) > THRESHOLD) h+Km |
mergeSort(data, temp, mid + 1, r); }}XYV eI
else e Ll+F%@
insertSort(data, mid + 1, r - mid); |ofegO}W7
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for (i = l; i <= mid; i++) { `k65&]&d
temp = data; *@fR36
} FX7=81**4
for (j = 1; j <= r - mid; j++) { z]ZhvH7-
temp[r - j + 1] = data[j + mid]; a&~_ba+
} 3DnlXH(h1
int a = temp[l]; 9^h\vR|]S
int b = temp[r]; }^WQNdws56
for (i = l, j = r, k = l; k <= r; k++) { <`*}$Zh
if (a < b) { Pk[:+. f(
data[k] = temp[i++]; vJDK]p<}
a = temp; obRR))
} else { * ]~ug%a
data[k] = temp[j--]; !)RND 6.
b = temp[j]; D8N}*4S
} 5Z}]d@
} SCE5|3j
} {.$5:<8aC
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/** -frmvNJ F
* @param data AR AC'F0
* @param l FR9qW$B
* @param i R%o:'-~
*/ ;4tVFqR
private void insertSort(int[] data, int start, int len) { S?n k9T+
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); %o9@[o
.]
} `E>HpRcxD
} L<!}!v5ja
} :#58m0YLA:
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}