归并排序: Q( {
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package org.rut.util.algorithm.support; ^Zy%fv,
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import org.rut.util.algorithm.SortUtil; M_w<m
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/** (41|'eB\\
* @author treeroot H_<C!OgR
* @since 2006-2-2 3fJc
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* @version 1.0 c#tjp(-
*/ Y.ToIka{
public class MergeSort implements SortUtil.Sort{ A^EE32kbm
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/* (non-Javadoc) ye? 'Ze
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) c>~*/%+
*/ ,V:SN~P66+
public void sort(int[] data) { ^J8lBLqe
int[] temp=new int[data.length]; ~Ti'FhN
mergeSort(data,temp,0,data.length-1); bl(RyAgA
} j;iAD:nf
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private void mergeSort(int[] data,int[] temp,int l,int r){ xZF}D/S?Ov
int mid=(l+r)/2; @Sbe^x
if(l==r) return ; *lw_=MXSK
mergeSort(data,temp,l,mid); KX7>^Bt&k
mergeSort(data,temp,mid+1,r); 6,9>g0y'NG
for(int i=l;i<=r;i++){ ;<2G
temp=data; 4G>H
} U,- 39mr
int i1=l; h"lv7;B$
int i2=mid+1; Ev(>z-{F
for(int cur=l;cur<=r;cur++){ @qlK6tE`
if(i1==mid+1) \3aoM{ztD
data[cur]=temp[i2++]; #!KE\OI;@5
else if(i2>r) YgV817OV
data[cur]=temp[i1++]; zXxT%ZcCj
else if(temp[i1] data[cur]=temp[i1++]; )fSOi||C
else 6Yxh9*N~]
data[cur]=temp[i2++]; YLE!m?
} Zt.|oYH$
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改进后的归并排序: Z//+Gw<'
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; Mz~D#6=
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/** dl@%`E48w
* @author treeroot ouFYvtF g
* @since 2006-2-2 l
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* @version 1.0 u=7J/!H7^
*/ 7.#F,Ue_0T
public class ImprovedMergeSort implements SortUtil.Sort { R1GEh&U{
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private static final int THRESHOLD = 10; os={PQRD
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/* 9!}8UALD
* (non-Javadoc) $!yW_HTx
* 1@1U/ss1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^R
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*/ 0dhaAq`k
public void sort(int[] data) { #(JNn'fzq
int[] temp=new int[data.length]; 4 k _vdz
mergeSort(data,temp,0,data.length-1); 5ZK@`jkE
} c~uKsU
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private void mergeSort(int[] data, int[] temp, int l, int r) { ,+xB$e
int i, j, k; c>RFdc:U
int mid = (l + r) / 2; F!Q@u
if (l == r) jQ
return; CtAwBQO
if ((mid - l) >= THRESHOLD) u5: q$P
mergeSort(data, temp, l, mid); r^paD2&}
else ~%=MpQ3
insertSort(data, l, mid - l + 1); 5r8<7g:>C
if ((r - mid) > THRESHOLD) lP@Ki5
mergeSort(data, temp, mid + 1, r); pd;br8yE$@
else (ECnMti+
insertSort(data, mid + 1, r - mid); ^xh ;
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for (i = l; i <= mid; i++) { 3ojlB |Z
temp = data; % <*g!y `
} 1@R
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for (j = 1; j <= r - mid; j++) { d>fkA0G/9!
temp[r - j + 1] = data[j + mid]; P} SCF
} N@1+O,o
int a = temp[l]; oxkoA
int b = temp[r]; 4^~(Mh- Mw
for (i = l, j = r, k = l; k <= r; k++) { OFv%B/O
if (a < b) { D \sWZ
data[k] = temp[i++]; V(6Z3g
a = temp; /1Q(b
} else { Yc
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data[k] = temp[j--]; jWl)cC
b = temp[j]; bc)~k:
} xt%7@/hiE
} Id|L`
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} C=It* j55
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/** G) 7;;
* @param data S.m{eur!,E
* @param l ,J>5:ht(6
* @param i 3.W@ }
*/ 3#&7-o
private void insertSort(int[] data, int start, int len) { O_DtvjI'
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 6%Pdy$ P
} Vz~nT
} |J}Mgb-4
}
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}