归并排序: d-dEQKI?;
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package org.rut.util.algorithm.support; )I.$=s
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import org.rut.util.algorithm.SortUtil; 6,{$J
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/** `+Q%oj#FF
* @author treeroot j8lb~0JD
* @since 2006-2-2 9;-p'C
* @version 1.0 %8~NqS|=
*/ a!AA]
public class MergeSort implements SortUtil.Sort{ SI-Ops~e
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/* (non-Javadoc) ^ (zYzd
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W9GVt$T7
*/ %d<"l~<5;
public void sort(int[] data) { 7O-x<P;
int[] temp=new int[data.length]; _zi|
mergeSort(data,temp,0,data.length-1); WEi2=3dV
} 0Z{ZO*rK
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private void mergeSort(int[] data,int[] temp,int l,int r){ :X
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int mid=(l+r)/2; G*P#]eO
if(l==r) return ; ^3L0w}#
mergeSort(data,temp,l,mid);
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mergeSort(data,temp,mid+1,r); fS78>*K
for(int i=l;i<=r;i++){ wi6
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temp=data; uk<9&{
} )|=j`jCC
int i1=l;
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int i2=mid+1; ?2Py_gkf
for(int cur=l;cur<=r;cur++){ wEvVL
if(i1==mid+1) P
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data[cur]=temp[i2++]; bB3powy9
else if(i2>r) UrEs4R1#
data[cur]=temp[i1++]; + @s"zp;F
else if(temp[i1] data[cur]=temp[i1++]; O[JL+g4
else 6G""I]uT
data[cur]=temp[i2++]; o]I\6,T/|
} %/ #NK1&M
} {[?(9u7R
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} J]pir4&j
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改进后的归并排序: 6gu!bu`~
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package org.rut.util.algorithm.support; lchPpm9
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import org.rut.util.algorithm.SortUtil; A*547=M/(j
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/** ={@6{-tl
* @author treeroot D7Q$R:6|
* @since 2006-2-2 >jc [nk
* @version 1.0 ]K,Tnyp
*/ KF!Yf\
public class ImprovedMergeSort implements SortUtil.Sort { Od,qbU4O
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private static final int THRESHOLD = 10;
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/* a'yK~;+_9
* (non-Javadoc) SbrecZ
* )W
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3K0A)W/YEs
*/ OU
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public void sort(int[] data) { ud@%5d
int[] temp=new int[data.length]; <&g,Nc'5C
mergeSort(data,temp,0,data.length-1); PmEsN&YP]
} 4yA+h2
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private void mergeSort(int[] data, int[] temp, int l, int r) { ;RPx^X~
int i, j, k; j/c&xv7=
int mid = (l + r) / 2; Sp]0c[37R
if (l == r) eiaFaYe\
return; XW)lDiJl
if ((mid - l) >= THRESHOLD) !Pfr,a
mergeSort(data, temp, l, mid); Vd+T$uC
else C{xaENp
insertSort(data, l, mid - l + 1); ^EQ<SCh
if ((r - mid) > THRESHOLD) F8,RXlGfA[
mergeSort(data, temp, mid + 1, r); ,G?WAOy,
else h_,i&d@(
insertSort(data, mid + 1, r - mid); j@3Q;F0ba
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for (i = l; i <= mid; i++) { 9W1YW9rL
temp = data; DgQpHF
} +.b,AqJ/
for (j = 1; j <= r - mid; j++) { .2Elr(&*h
temp[r - j + 1] = data[j + mid]; yEoF4bt
} Ww+IWW@
int a = temp[l]; Ad9}9!<
int b = temp[r]; x,pjpx
for (i = l, j = r, k = l; k <= r; k++) { l'E*=Rn
if (a < b) { paE[rS\
data[k] = temp[i++]; 3J|F?M"N7
a = temp; }?_?V&K|
} else { 4-y:/8
data[k] = temp[j--]; By",rD- r
b = temp[j]; u?<%q!
} yfjWbW
} Z4w!p?Wqa
} 6@F9G4<Z
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/** dhf!o0'1M
* @param data u5b|#&-mX
* @param l Y>dzR)~3[
* @param i W ]?G}Q;
*/ S3*`jF>q
private void insertSort(int[] data, int start, int len) { pG^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); m6\E$;`
} ~#[yJNYQ
} .K2qXw"S#
} n&qg;TT
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}