归并排序: F3'G9Xf8Q=
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package org.rut.util.algorithm.support; :zoX
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import org.rut.util.algorithm.SortUtil; Plv+ mb
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/** h)8_sC
* @author treeroot .42OSV
* @since 2006-2-2 C?J%^?v
* @version 1.0 glUP
*/ .})8gL7V
public class MergeSort implements SortUtil.Sort{ W_EN4p~J
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/* (non-Javadoc) .j.=|5nVo4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) V-|}.kOH2
*/ '`"&RuB
public void sort(int[] data) { F'!}$oT"
int[] temp=new int[data.length]; Wov_jVdN\
mergeSort(data,temp,0,data.length-1); +d96Z^KUhv
} cm<3'#~Q?
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private void mergeSort(int[] data,int[] temp,int l,int r){ 9p<l}h7g
int mid=(l+r)/2; ??;[`_h{bz
if(l==r) return ; }Q_i#e(S
mergeSort(data,temp,l,mid); R(fR1
mergeSort(data,temp,mid+1,r); vYkoh/(/u
for(int i=l;i<=r;i++){ Dr<Bd;)
temp=data; u8QX2|
} xcA`W|M
int i1=l; zrM|8Cu
int i2=mid+1; im"v75 tc
for(int cur=l;cur<=r;cur++){ #c_ZU\"h"
if(i1==mid+1) ,\b5M`<c
data[cur]=temp[i2++]; .#}R$}e+
else if(i2>r) V7<}
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data[cur]=temp[i1++]; 7y&`H
else if(temp[i1] data[cur]=temp[i1++]; %,BJkNV
else xOH@V4z:
data[cur]=temp[i2++]; ^EZoP:x(oE
} e$Ej7_.#;
} W:G*t4i
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改进后的归并排序: +$C5V,H~
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package org.rut.util.algorithm.support; ]MyWB<9M
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import org.rut.util.algorithm.SortUtil; ~}fpe>M:
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/** z\, w$Ef+
* @author treeroot (J;<&v}Gad
* @since 2006-2-2 FrS>.!OFn
* @version 1.0 S_zE+f+
2
*/ v?rN;KY#pK
public class ImprovedMergeSort implements SortUtil.Sort { b~-9u5.L1
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private static final int THRESHOLD = 10; {^F_b% a4z
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/* <\u%ZB
* (non-Javadoc) QQcJUOxT9
* wSGUNP9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9j/B3CjW
*/ Fa8>+
public void sort(int[] data) { 4I$#R
int[] temp=new int[data.length]; _#I0m(
mergeSort(data,temp,0,data.length-1); 8oK30?
} ,fbO}
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private void mergeSort(int[] data, int[] temp, int l, int r) { HDYoM
int i, j, k; PeOgXg)L`z
int mid = (l + r) / 2; @U,cj>K
if (l == r) AyWCb
return; g_`8K,6ln
if ((mid - l) >= THRESHOLD) ;,D7VxWhY
mergeSort(data, temp, l, mid); \I>,j,c
else YB[P`Muj
insertSort(data, l, mid - l + 1); LS;kq',
if ((r - mid) > THRESHOLD) Y) Z>Bi
mergeSort(data, temp, mid + 1, r); };|'8'5
else *ZHk^d:
insertSort(data, mid + 1, r - mid); 0z.&
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for (i = l; i <= mid; i++) { <5
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temp = data; z[B7k%}
} YS9| J=!~
for (j = 1; j <= r - mid; j++) { D .E>Y
temp[r - j + 1] = data[j + mid]; -1[ri8t;nV
} `ainJs:B
int a = temp[l]; C]}0h!_V
int b = temp[r]; ]0o78(/w2
for (i = l, j = r, k = l; k <= r; k++) { T
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if (a < b) { *<KY^;
data[k] = temp[i++]; |oX l+&u
a = temp; a83o(9
} else { <=p"ck@
data[k] = temp[j--]; lPjgBp{/
b = temp[j]; w!Z3EA ;`
} ]>!]X*\9
} 0=~Ji_5mB
} Zu!3RN[lp?
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/** QJxcH$
* @param data ~*&_zPTN
* @param l fV3J:^)F
* @param i 27)$;1MT:
*/ $OmtN"
private void insertSort(int[] data, int start, int len) { ~yci2{
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); cOIshT1
} zZkwfF
} FG?B:Zl%T
} U]_1yX
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}