归并排序: {{FA"NW
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package org.rut.util.algorithm.support; !&~8j7{
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import org.rut.util.algorithm.SortUtil; QlbhQkn
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/** 8"C;I=]8
* @author treeroot Jm%hb,
* @since 2006-2-2 ^1&xt(G
* @version 1.0 8}Pd- .se
*/ fk(l.A$
public class MergeSort implements SortUtil.Sort{ OG#7Va
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/* (non-Javadoc) HJY_l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {J:ZM"GS
*/ uUAib<wdPL
public void sort(int[] data) { ~=t,g S
int[] temp=new int[data.length]; 7\'ow|)}v
mergeSort(data,temp,0,data.length-1); IN? A`A
} 97H2hYw9l
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private void mergeSort(int[] data,int[] temp,int l,int r){ _IAvFJI
int mid=(l+r)/2; S9sFC!s1g
if(l==r) return ; R5QSf+/T4
mergeSort(data,temp,l,mid); l8n}&zX
mergeSort(data,temp,mid+1,r); Z%*_kk
for(int i=l;i<=r;i++){ (n&Hjz,Fv
temp=data; b"Hg4i)
} O5PCR6U
int i1=l; AHws5#;$6*
int i2=mid+1; G0sg\]
for(int cur=l;cur<=r;cur++){ F,CQAgx
if(i1==mid+1) h[()!\vBy
data[cur]=temp[i2++]; :#!m(s`
else if(i2>r) tS2 P|fl
data[cur]=temp[i1++]; (7nWv43
else if(temp[i1] data[cur]=temp[i1++]; & A=q _
else _
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data[cur]=temp[i2++]; U!@3['
} ]Y|Y ?
} &`7tX.iMlh
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} 8aw'Q?
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改进后的归并排序: xACAtJ'gc
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package org.rut.util.algorithm.support; (rcH\
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import org.rut.util.algorithm.SortUtil; /*Z,i&eC
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/** )j6VROt
* @author treeroot @] .Ko[P~
* @since 2006-2-2 ]R^?Pa1Te4
* @version 1.0 }U$Yiv
*/ A_: Bz:
public class ImprovedMergeSort implements SortUtil.Sort { YQ>M&lnQ<
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private static final int THRESHOLD = 10; ~4th;#'
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/* qyMR0ai-
* (non-Javadoc) ZHxdrX)
* \WD}@6)
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <C\snB
*/ /H+j6*}r
public void sort(int[] data) { a;AvY O
int[] temp=new int[data.length]; }Vw"7
mergeSort(data,temp,0,data.length-1); IfoeHAWX
} BH0@WG7F
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private void mergeSort(int[] data, int[] temp, int l, int r) { vJkY
int i, j, k; dBY,&=T4p
int mid = (l + r) / 2; l -~HY*
if (l == r) y\Z7]LHCqw
return; #RK?3?wcr
if ((mid - l) >= THRESHOLD) |+//pGx
mergeSort(data, temp, l, mid); X}`|"NIk.
else @dAc2<4
insertSort(data, l, mid - l + 1); C7&4, ],
if ((r - mid) > THRESHOLD) +Io^U
mergeSort(data, temp, mid + 1, r); M{+Ie?ZI
else xW*L^97 ;
insertSort(data, mid + 1, r - mid); MyZ@I7Fb,
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for (i = l; i <= mid; i++) { yG'5u p
temp = data; Ip]-OVg
} 8>G3KZ3
for (j = 1; j <= r - mid; j++) { bH+p5Fd;
temp[r - j + 1] = data[j + mid]; >
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} HT/zcd)}#
int a = temp[l]; ,Z*?"d
int b = temp[r]; \R45#.
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for (i = l, j = r, k = l; k <= r; k++) { 6sb,*uSn%
if (a < b) { vj<HthC.k
data[k] = temp[i++]; #KZ6S9>@
a = temp; xtL_,ug
} else { Z^9;sb,x
data[k] = temp[j--]; :(,uaX>{
b = temp[j]; gq`gitu0
} $Jo[&,
} q#Az\B:
} KumbG>O
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/** zzi%r=%r&
* @param data bLoAtI
* @param l agX-V{l.
* @param i 6/B"H#rN
*/ kpi)uGvGUA
private void insertSort(int[] data, int start, int len) { 92+LY]jS
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1);
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} TFWV(<
} XRVE8v+
} /02|b}{
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}