归并排序: osB8
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package org.rut.util.algorithm.support; 1$1s0yg
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import org.rut.util.algorithm.SortUtil; 7Q_AZR4
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/** 0xv@l^B
* @author treeroot !aylrJJ
* @since 2006-2-2 ?;{d
* @version 1.0 %qN_<W&Ze
*/ % Q| >t~
public class MergeSort implements SortUtil.Sort{ o{C7V*
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/* (non-Javadoc) /da5"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?f}lYQzM
*/ tXZE@JyuC
public void sort(int[] data) { }r%Si
int[] temp=new int[data.length]; 8Jnl!4
mergeSort(data,temp,0,data.length-1); |ATz<"q>
} WX2:c,%:
ey icMy`7{
private void mergeSort(int[] data,int[] temp,int l,int r){ 5G$sP,n
int mid=(l+r)/2; QOb+6qy:3
if(l==r) return ; R<"fcsU
mergeSort(data,temp,l,mid); `TugtzRU
mergeSort(data,temp,mid+1,r); +@n8DM{b
for(int i=l;i<=r;i++){ P;B<R"
temp=data; J`uO~W"
} sR(or=ub~
int i1=l; m6'VMW
int i2=mid+1; s"tyCDc.c
for(int cur=l;cur<=r;cur++){ 12W`7
if(i1==mid+1) W Z!?O0.A
data[cur]=temp[i2++]; gG^A6Ol%D
else if(i2>r) Zq,[se'nh"
data[cur]=temp[i1++]; d<x7* OW)
else if(temp[i1] data[cur]=temp[i1++]; n+ot. -
else rt5FecX\
data[cur]=temp[i2++]; |:yWDZg[
} ;"d>lyL
} O7]p `Xi8
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} zk#NM"C+
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改进后的归并排序: H]^hEQ3DT
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package org.rut.util.algorithm.support; ,RP"m#l!\
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import org.rut.util.algorithm.SortUtil; LIm{Y`XU
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/** 8XS_I{}?
* @author treeroot HUP~
* @since 2006-2-2 p,(gv])ie
* @version 1.0 Nft~UggK
*/ G=1&:nW'
public class ImprovedMergeSort implements SortUtil.Sort {
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private static final int THRESHOLD = 10; -'q#u C
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/* u
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* (non-Javadoc) H K]-QTEn
* F!N D
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CrvL[6i
*/ 6"OwrJB
public void sort(int[] data) { \B72 #NR
int[] temp=new int[data.length]; iZ^tLnc
mergeSort(data,temp,0,data.length-1); n5Coxvy1
} c >8IM
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private void mergeSort(int[] data, int[] temp, int l, int r) { fN!ci']
int i, j, k; :NHP,"
int mid = (l + r) / 2; pm)kocG
if (l == r) Wqy\yS [
return; =sp5.-r
if ((mid - l) >= THRESHOLD) =hw&2c
mergeSort(data, temp, l, mid); #![9QUvcf
else eNQQ`ll@m
insertSort(data, l, mid - l + 1); ~g#$'dS
if ((r - mid) > THRESHOLD) >EacXPt-O
mergeSort(data, temp, mid + 1, r); /-{C,+cB
else FV 0x/)<z
insertSort(data, mid + 1, r - mid); \/wbk`2
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for (i = l; i <= mid; i++) { Q+i
temp = data; z(o zMH
} &d%0[Ui`
for (j = 1; j <= r - mid; j++) { x>C_O\
temp[r - j + 1] = data[j + mid]; g-4m.;
} yA+NRWWj
int a = temp[l]; 88]4GVi
int b = temp[r]; NZ|(#` X
for (i = l, j = r, k = l; k <= r; k++) { bXiOf#:''
if (a < b) { k}0Y&cT!rU
data[k] = temp[i++]; 3QD+&9{D
a = temp; qcmf*Yl:v
} else { [.
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data[k] = temp[j--]; 6d# 7
b = temp[j];
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} .kl.awT
} e>6NO
} E"/r*C+T
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/** EF8~rKO3
* @param data +o ;}*
* @param l pHftz-RS!
* @param i 7NFRCCXHQ
*/ X2[d15!9
private void insertSort(int[] data, int start, int len) { 2HX#:y{\l
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); i".nnAI:
} )j_Y9`R
} [& d"Z2gK
} u/ Gk>F
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}