归并排序: %G
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package org.rut.util.algorithm.support; U
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import org.rut.util.algorithm.SortUtil; u^uG_^^,/
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/** q'r3a+
* @author treeroot 0Q9OQqg
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* @since 2006-2-2 Uwk|M?94
* @version 1.0 LN^8U
*/ &40]sxm
public class MergeSort implements SortUtil.Sort{ b#U%aPH
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/* (non-Javadoc) ,m8*uCf
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "F}Ip&]hAG
*/ `QF|>
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public void sort(int[] data) { gD\}CxtG
int[] temp=new int[data.length]; mx4*zj
mergeSort(data,temp,0,data.length-1); <i6M bCB
} ]>o2P cb;
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private void mergeSort(int[] data,int[] temp,int l,int r){ iT"Itz-^#
int mid=(l+r)/2; *)1z-rH`
if(l==r) return ; J#]yKgT
mergeSort(data,temp,l,mid); 4\3t5n
mergeSort(data,temp,mid+1,r); w1b
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for(int i=l;i<=r;i++){ SAJ=)h~
temp=data; FM)*>ax{
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int i1=l; t_dg$KB
int i2=mid+1; 9="sx 8?
for(int cur=l;cur<=r;cur++){ 6KG 63`aQ
if(i1==mid+1) WGx>{'LJ
data[cur]=temp[i2++]; #w@Pa L iS
else if(i2>r) aB)DX
data[cur]=temp[i1++]; Z(eSnV_RL
else if(temp[i1] data[cur]=temp[i1++]; NZ5~\k
else nE;gM1I
data[cur]=temp[i2++]; ?OyW|jL
} (c2\:hvy
}
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} WU\bJ}
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改进后的归并排序: ($W 5fbu
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package org.rut.util.algorithm.support; j[cjQ]>~'
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import org.rut.util.algorithm.SortUtil; &L]*]Xz;
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/** #O+]ydvT
* @author treeroot #^ #i]{g
* @since 2006-2-2 nW_
* @version 1.0 ~2431<YV
*/ PEIr-qs%D
public class ImprovedMergeSort implements SortUtil.Sort { BkfBFUDQ
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private static final int THRESHOLD = 10; Hrnql
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/* E;H(jVZ
* (non-Javadoc) n #I}!x>2
* Kj
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =[+&({
*/ 5#\p>}[HG
public void sort(int[] data) { *,*qv^
int[] temp=new int[data.length]; iGk{8Da<
mergeSort(data,temp,0,data.length-1); {B.]w9
} @\8gzvkt
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private void mergeSort(int[] data, int[] temp, int l, int r) { Qu _T&
int i, j, k; hp4(f W
int mid = (l + r) / 2; o7XRa]O
if (l == r) #UD
return; qu+2..3
if ((mid - l) >= THRESHOLD) vP?S0>gh
mergeSort(data, temp, l, mid); #.YcIR)
else );DIrA
insertSort(data, l, mid - l + 1); 2kq@*}ys
if ((r - mid) > THRESHOLD) 8]\h^k4f
mergeSort(data, temp, mid + 1, r); {fv8S;|u
else FF~4y>R7u
insertSort(data, mid + 1, r - mid); neFno5d j
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for (i = l; i <= mid; i++) { K<JP9t6Qd
temp = data; ,{*fOpn
} QvN
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for (j = 1; j <= r - mid; j++) { L0 2~FT
temp[r - j + 1] = data[j + mid]; 7=A9E]:
} {Y%=/ba W
int a = temp[l]; Ki6.'#%7
int b = temp[r]; Sr 4 7u{n
for (i = l, j = r, k = l; k <= r; k++) { [F[<2{FQF
if (a < b) { K0=E4>z,`q
data[k] = temp[i++]; $ _Bu,;
a = temp; Q]UYG(
} else { <" l;l~Y1
data[k] = temp[j--]; !DL53DQ#
b = temp[j]; Ytwv=;h-
} q.[[c
} .OS?^\
} \1C!,C
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/** Nw&}qSN
* @param data aq/Y}s?
* @param l u!Nfoq&'u
* @param i DLVs>?Y
*/ /1#Q=T
private void insertSort(int[] data, int start, int len) { U]EuDNkO{
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); `oRs-,d|<
} FK >8kC
} wK`ieHmp
} NV(4wlh)y
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}