归并排序: N;HIsOT}t
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package org.rut.util.algorithm.support; *s)}Bj
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import org.rut.util.algorithm.SortUtil; F6S~$<
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/**
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* @author treeroot nhdTTap&9
* @since 2006-2-2 jN/C'\QL
* @version 1.0 Nm]%
}
*/ uD>z@J-v
public class MergeSort implements SortUtil.Sort{ S<6k0b(,_3
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/* (non-Javadoc) .dq
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ vz`@x45K
public void sort(int[] data) { o*ANi;1]&B
int[] temp=new int[data.length]; 6ri#Lw
mergeSort(data,temp,0,data.length-1); 8
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} ?\H.S9CZ^
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private void mergeSort(int[] data,int[] temp,int l,int r){
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int mid=(l+r)/2; (U87}}/l
if(l==r) return ; ;RN8\re
mergeSort(data,temp,l,mid); q42FPq
mergeSort(data,temp,mid+1,r); ua
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for(int i=l;i<=r;i++){ FUeq
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temp=data; *+lsZ8'^C
} lr('k`KOQ
int i1=l; LxJ6M/".
int i2=mid+1; Ff"gadRXd
for(int cur=l;cur<=r;cur++){ i(HByI
if(i1==mid+1) h(xP_Svj>
data[cur]=temp[i2++]; [@{0o+.]'H
else if(i2>r) <>4!XPo%J
data[cur]=temp[i1++]; ;R[&pDx
else if(temp[i1] data[cur]=temp[i1++]; zp=!8Av
else OM96`
data[cur]=temp[i2++]; 'M'w,sID
} K5 vNhA
} f\ "`7
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改进后的归并排序: )teFS%
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package org.rut.util.algorithm.support; DBbc|I/[l
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import org.rut.util.algorithm.SortUtil; ?ow'^X-
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/** (iDBhC;/B
* @author treeroot 0#|7U_n
* @since 2006-2-2 fuSq ={]
* @version 1.0 /GsrGX8
*/ ;9rTE|n
public class ImprovedMergeSort implements SortUtil.Sort { lL2-.!]R
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private static final int THRESHOLD = 10; ~%aJFs
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/* c2b6B.4
* (non-Javadoc) _:,.yRez
* w yD%x(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +Hy4s[_|
*/ xw%)rm<t
public void sort(int[] data) { GAJ~$AiwHH
int[] temp=new int[data.length]; Ff/Ig]Lb
mergeSort(data,temp,0,data.length-1); r%!FmS<
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private void mergeSort(int[] data, int[] temp, int l, int r) { ku3D?D:V
int i, j, k;
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int mid = (l + r) / 2; $,`VUe{
if (l == r) YeIe\3x!N
return; ]N\6h(**wy
if ((mid - l) >= THRESHOLD) $5/\Z
mergeSort(data, temp, l, mid); cHn;}l!I
else _[$#
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insertSort(data, l, mid - l + 1); 'oi2Seq
if ((r - mid) > THRESHOLD) M'|)dM|
mergeSort(data, temp, mid + 1, r); T#e4":A&x
else q}Rlo/R
insertSort(data, mid + 1, r - mid); ~|=rwDBZ8l
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for (i = l; i <= mid; i++) { 8dV=1O$/
temp = data; GEi
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} vU9~[I`^p
for (j = 1; j <= r - mid; j++) { (6#M9XL
temp[r - j + 1] = data[j + mid]; iQj2UTds3
} (1y='L2rj
int a = temp[l]; p5qx=p~c
int b = temp[r]; z[FI2jl
for (i = l, j = r, k = l; k <= r; k++) { 9d] tjT
if (a < b) { T+BIy|O
data[k] = temp[i++]; ! [q}BU4
a = temp; xc*!W*04
} else { u
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data[k] = temp[j--]; [#zE.
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b = temp[j]; JB'qiuhab
} <"NyC?b+G
} _s@bz|yqw
} 6 <r2*`
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/** \v s%U}IrO
* @param data !SN WB
* @param l u
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* @param i wjg}[R@!
*/ V4oak!}?
private void insertSort(int[] data, int start, int len) { d.b?!kn
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); dWIZ37w+D
} |3"NwM>
} {SHqW5VX
} /9TL&_A-T
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}