归并排序: Jc~^32
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package org.rut.util.algorithm.support; K~<pD:s
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import org.rut.util.algorithm.SortUtil; 1)?^N`xF
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/** @I\Z2-J
* @author treeroot jz't!wj
* @since 2006-2-2 t!c8c^HR
* @version 1.0 aQCbRS6
*/ vY *p][$
public class MergeSort implements SortUtil.Sort{ n}
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/* (non-Javadoc) &~pj)\_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) IE$x2==)
*/ |.=Ee+HZ
public void sort(int[] data) { ($E(^p% O
int[] temp=new int[data.length]; FRF3V>
mergeSort(data,temp,0,data.length-1); )~_!u}+:(
} WEqHL,Uh]
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private void mergeSort(int[] data,int[] temp,int l,int r){ >r{3t{
int mid=(l+r)/2; TUJ]u2J8?
if(l==r) return ; }!0,(<EsV
mergeSort(data,temp,l,mid); nf,>l0,,'
mergeSort(data,temp,mid+1,r); yZHQql%J
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for(int i=l;i<=r;i++){ m(y?3}h
temp=data; c[!e*n!y
} Ptzha?}OZ
int i1=l; DG8$zl5
int i2=mid+1; $8_t.~q
for(int cur=l;cur<=r;cur++){ LoOyqJ,
if(i1==mid+1) l6xC'c,jg
data[cur]=temp[i2++]; =ADAMP
else if(i2>r) I
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data[cur]=temp[i1++]; c1wgb8
else if(temp[i1] data[cur]=temp[i1++]; dS0G+3J&+E
else \>cZ=
data[cur]=temp[i2++]; 9XT6Gf56
} ]O<Yr'
} ]SBv3Q0D7
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} NTXT0:
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改进后的归并排序: }tft@,dIC
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package org.rut.util.algorithm.support; _M:)x0("
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import org.rut.util.algorithm.SortUtil; aZ=WK4
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/** ~IE:i-Kz
* @author treeroot =zVbZ7
* @since 2006-2-2 o4Fh`?d}
* @version 1.0 mb0${n~fz
*/ IL3,dad'^
public class ImprovedMergeSort implements SortUtil.Sort { 8 PXleAn
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private static final int THRESHOLD = 10; $Y$!nPO
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/* U( W#H|
* (non-Javadoc) J2aA"BhdC"
* n.$<D[@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )K@ 20Q+0K
*/ gD=s~DgN)
public void sort(int[] data) { bT[Q:#GL
int[] temp=new int[data.length]; J9/9k
mergeSort(data,temp,0,data.length-1); s]L`&fY]O
} ?U|~h1
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private void mergeSort(int[] data, int[] temp, int l, int r) { YH':cze
int i, j, k; TUy*wp9
int mid = (l + r) / 2; UT+\IzL
if (l == r) Yr-,0${m
return; k49CS*I
if ((mid - l) >= THRESHOLD) X%`8h_
mergeSort(data, temp, l, mid); s<:"rw`
else SnQ$
insertSort(data, l, mid - l + 1); d#ld*\|
if ((r - mid) > THRESHOLD) 8k_,Hni
mergeSort(data, temp, mid + 1, r); SwC,=S
else umrRlF4M;
insertSort(data, mid + 1, r - mid); <6dD{{J]>p
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for (i = l; i <= mid; i++) { v
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temp = data; 4$IPz7
} ,"h$!k"$g
for (j = 1; j <= r - mid; j++) { `*}#Bks!
temp[r - j + 1] = data[j + mid]; )KXLL;]
} +]uy
int a = temp[l]; !G\1$"T$
int b = temp[r]; 8"oS1W
for (i = l, j = r, k = l; k <= r; k++) { w$Dp m.0(
if (a < b) { Vy}:Q[
data[k] = temp[i++]; w/YKWv{_S
a = temp; 4yRT!k}o
} else { Ba`]Sm=
data[k] = temp[j--]; qf)]!wU9
b = temp[j]; 9!bD|-6y
} ((.PPOdJV
} gl]{mUZz}
} %*|XN*i XC
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/** gP/]05$e
* @param data IFG`
* @param l 3XL0Pm
* @param i 6K`frt
*/ 7acAU{Rr
private void insertSort(int[] data, int start, int len) { ,wX/cUyZ
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); .WyI.Y1
} HD=WHT&
} JG/sKOlA
} Z]9
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}