归并排序: cyH=LjgJf
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package org.rut.util.algorithm.support; =:=s
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import org.rut.util.algorithm.SortUtil; qNX+!Y}y
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/** RH^;M-'
* @author treeroot ;-quK%VO!
* @since 2006-2-2 2v{42]XYf
* @version 1.0 0
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*/ Q;k
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public class MergeSort implements SortUtil.Sort{ f3SAK!V+s
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/* (non-Javadoc) J?/NJ-F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {`+:!X
*/ i;<K)5Z
public void sort(int[] data) { wpf
int[] temp=new int[data.length]; ]T>|Y0 |
mergeSort(data,temp,0,data.length-1); , GMuq_H
} H><!
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private void mergeSort(int[] data,int[] temp,int l,int r){ !|-:"hE1h
int mid=(l+r)/2; f!bGH-.r5
if(l==r) return ; "u3 N9
mergeSort(data,temp,l,mid); $%zM Z
mergeSort(data,temp,mid+1,r); 2#Y5*r's\
for(int i=l;i<=r;i++){ D6:"k
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temp=data; qz
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}
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int i1=l; ?jn";:
int i2=mid+1; N6h.zl&04
for(int cur=l;cur<=r;cur++){ *lyRy/POB
if(i1==mid+1) y<^hM6S?Z
data[cur]=temp[i2++]; Wl{wY,u
else if(i2>r) kj@m5`G
data[cur]=temp[i1++]; +K61-Div
else if(temp[i1] data[cur]=temp[i1++]; r1zuc:W1
else fvM|Jb
data[cur]=temp[i2++]; t Z]b0T(e
} ,%]xT>kH
} fH 0&Wc3yC
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改进后的归并排序: ,S7M4ajVZB
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package org.rut.util.algorithm.support; (@cZmU,
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import org.rut.util.algorithm.SortUtil; J72YZrc
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/** c59l/qoz
* @author treeroot !z_VwZ#,
* @since 2006-2-2 PHqIfH [
* @version 1.0 ^:]~6p#
*/ J0yo@O
public class ImprovedMergeSort implements SortUtil.Sort { Am)XbN')1
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private static final int THRESHOLD = 10; htHnQ4Q
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/* "uD^1'IW2
* (non-Javadoc) }zqYn`ffD
* #3((f[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [ FNA:
*/ LYp=o8JW|
public void sort(int[] data) { psAdYEGk!
int[] temp=new int[data.length]; &&($LnyA]
mergeSort(data,temp,0,data.length-1); QVQ?a&HYS
} MUqV$#4@I
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private void mergeSort(int[] data, int[] temp, int l, int r) { Pt8 U0)i)
int i, j, k; ewv[nJD$
int mid = (l + r) / 2; ^r0mx{i&
if (l == r) 2z[A&s_
return; IQQWp@w#8
if ((mid - l) >= THRESHOLD) ~U_,z)<`)c
mergeSort(data, temp, l, mid); s9b 6l,Z
else |T^c(RpOE
insertSort(data, l, mid - l + 1); 2?nhkast#=
if ((r - mid) > THRESHOLD) nh+f,HtSt
mergeSort(data, temp, mid + 1, r); 06~HVv
else Mwd(?o
insertSort(data, mid + 1, r - mid); G9P)Y#WB
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for (i = l; i <= mid; i++) { Irnfr\l.
temp = data; Rjz~n38.
} >6"u{Qmr
for (j = 1; j <= r - mid; j++) { cG~-OHU
temp[r - j + 1] = data[j + mid]; s6J`i&uu
} -% Z?rn2
int a = temp[l]; tN:PWj5
int b = temp[r]; Wf>scl`s
for (i = l, j = r, k = l; k <= r; k++) { 5rx;?yvn
if (a < b) { $C8nPl' 7
data[k] = temp[i++]; ?O<D&CvB
a = temp; x-HN]quhe
} else { \%+5p"Z<
data[k] = temp[j--];
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b = temp[j]; p2:>m\
} ,wEcRN w
} c})f&Z@<
} wA;Cj
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/** 9akIu.H
* @param data KWH l+pL
* @param l 26Jb{o9Z<
* @param i d~U}IMj
*/ hbg:}R=B<
private void insertSort(int[] data, int start, int len) { ~t-!{F
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Wy`ve~y
}
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} ht1d[
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}