归并排序: Tweku}D7
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package org.rut.util.algorithm.support; RO+N>Wkt
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import org.rut.util.algorithm.SortUtil; eQqx0+-0c
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/** zLda+
* @author treeroot s/0S]P]}f
* @since 2006-2-2 DYFfq
* @version 1.0 sV`!4
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*/ S)$iHBx{
public class MergeSort implements SortUtil.Sort{ E\Et,l#|LY
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/* (non-Javadoc) Y ZyV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -\V!f6Q
*/ ,`O.0e4pn
public void sort(int[] data) { 4V9S~^v|
int[] temp=new int[data.length]; VHihC]ks,
mergeSort(data,temp,0,data.length-1); 5.3=2/
} 84eqT[I'
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private void mergeSort(int[] data,int[] temp,int l,int r){ 3q*p#l~
int mid=(l+r)/2; Uop`)
if(l==r) return ; sOUQd-!"
mergeSort(data,temp,l,mid); nWz7$O
mergeSort(data,temp,mid+1,r); ;S.o`z1GI
for(int i=l;i<=r;i++){ ;bhD:$NB X
temp=data; z IT)Hs5
} ;*}tbh3;.
int i1=l; |s$w
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int i2=mid+1; Z_.xglq{
for(int cur=l;cur<=r;cur++){ L.tW]43K
if(i1==mid+1) rZSD)I
data[cur]=temp[i2++]; 0c6Ea>S[
else if(i2>r) 8.m9 =+)8
data[cur]=temp[i1++]; }s++^uX6
else if(temp[i1] data[cur]=temp[i1++]; !5XH.DYq!
else g/f^|:
data[cur]=temp[i2++]; R Q2DTQ-$
} 3JJEj1O
} @zGz8IF
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} O=E?m=FR"
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改进后的归并排序: wFX>y^ 1
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package org.rut.util.algorithm.support; h1AZ+9
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import org.rut.util.algorithm.SortUtil; J=sj+:GS
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/** mo()l8
* @author treeroot /fDXO;tN
* @since 2006-2-2 QopA'm
* @version 1.0 ')#!M\1,HQ
*/ xh`4s
public class ImprovedMergeSort implements SortUtil.Sort { UOYhz.
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private static final int THRESHOLD = 10; gHmy?+)
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/* F+Q(^Nk
* (non-Javadoc) thK4@C|X4
* dp DPSI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ 0n-S%e5
public void sort(int[] data) { =Hf`yH\#
int[] temp=new int[data.length]; &\>. j|
mergeSort(data,temp,0,data.length-1); RoYwZX~
} rMEM$1vPU
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private void mergeSort(int[] data, int[] temp, int l, int r) { 3K{G =WE$
int i, j, k; 6s(.ul
int mid = (l + r) / 2; %&}gt+L(M
if (l == r) tx_h1[qi
return; h=
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if ((mid - l) >= THRESHOLD) C=,O'U(ep
mergeSort(data, temp, l, mid); m[8?d~
else $;VY`n
insertSort(data, l, mid - l + 1); (F=q/lK$
if ((r - mid) > THRESHOLD) *pj^d><
mergeSort(data, temp, mid + 1, r); (JdZl2A.
else i!u:]14>
insertSort(data, mid + 1, r - mid); %D6HY^]ayw
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for (i = l; i <= mid; i++) { X-k$6}D
temp = data; Mp,aQ0bNS
} %k i^XB86
for (j = 1; j <= r - mid; j++) { !si}m~K!_
temp[r - j + 1] = data[j + mid]; Q.i_?a
} @aY>pr5!
int a = temp[l]; HyGu3
int b = temp[r]; A(6n- zL
for (i = l, j = r, k = l; k <= r; k++) { Pe?=M[u2
if (a < b) { fb|%)A=
data[k] = temp[i++]; /0z#0gNp
a = temp; y*H rv
} else { HVH <S
data[k] = temp[j--]; 7v]9) W=y
b = temp[j]; hZwJ@ Vm#
} %R m`+
} !cNw8"SIU
} 1)v]<Ga~%1
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/** W!B\VB
* @param data w
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* @param l CX3yIe~u
* @param i :J;&Z{
*/ BRTCo,i
private void insertSort(int[] data, int start, int len) { "(+p1
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); IrMxdF~c
} S pIdw0
} iTcq=
} 05s{Z.aK
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}