归并排序: Q o?O:
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package org.rut.util.algorithm.support; U@gn;@\
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import org.rut.util.algorithm.SortUtil; "l*Pd$sr
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/** <\Eh1[F
* @author treeroot 9^,Lc1"M>
* @since 2006-2-2 9;_sC
* @version 1.0 '$|[R98
*/ %<E$,w>
public class MergeSort implements SortUtil.Sort{ ~;1l9^N|
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/* (non-Javadoc) }2(,K[?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n;(\5{a
*/ LNrX;{ Z
public void sort(int[] data) { 9/hrjItV
int[] temp=new int[data.length]; 99}(~B
mergeSort(data,temp,0,data.length-1); |p><'Q%*
} ?*E'^~,H)
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private void mergeSort(int[] data,int[] temp,int l,int r){ ZkA U17f
int mid=(l+r)/2; jgbLN/_{
if(l==r) return ; F_;vO%}
mergeSort(data,temp,l,mid); !wWJ^Oz=
mergeSort(data,temp,mid+1,r); Y2O"]phi@
for(int i=l;i<=r;i++){ YFTjPBV
temp=data; Fh*j#*oe
} qVdwfT{1J
int i1=l; oX4q`rt
int i2=mid+1; fd#jY}
for(int cur=l;cur<=r;cur++){ 3
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if(i1==mid+1) &EM\CjKv"
data[cur]=temp[i2++]; $-&BB(-{E&
else if(i2>r) {<5ybbhLV
data[cur]=temp[i1++]; iA,kX\nK
else if(temp[i1] data[cur]=temp[i1++]; MgC:b-&5_
else q|%(3,)ig
data[cur]=temp[i2++]; i[ $0a4
} 5o/&T"]@
} 4:7V./" 9
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} $46{<4.
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改进后的归并排序: < Z|Ep1W
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package org.rut.util.algorithm.support; J|3E- p\o
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import org.rut.util.algorithm.SortUtil; nkv(~ej(
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/** Lw'9
* @author treeroot !6G?zipB
* @since 2006-2-2 n9;;x%6 .I
* @version 1.0 DOz\n|8S
*/ A!vCb
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public class ImprovedMergeSort implements SortUtil.Sort { SSBg?H 'T
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private static final int THRESHOLD = 10; +f0~D(d!_
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/* 7n o5b]
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* (non-Javadoc) "C?5f]T
*
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S\NL+V?7h
*/ <TL])@da
public void sort(int[] data) { *J.c $1#h
int[] temp=new int[data.length]; y>%W;r)
mergeSort(data,temp,0,data.length-1); i>WOYI9
} iq,ah"L
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private void mergeSort(int[] data, int[] temp, int l, int r) { J&'>IA
int i, j, k; N:twq&[Y
int mid = (l + r) / 2; (2cGHYU3N<
if (l == r) FF8WTuzB+
return; 3g^IXm:K$
if ((mid - l) >= THRESHOLD) c
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mergeSort(data, temp, l, mid); JXlTN[O
else Ia=&.,xub
insertSort(data, l, mid - l + 1); *>G^!e.u
if ((r - mid) > THRESHOLD) MPqY?KF
mergeSort(data, temp, mid + 1, r); {`tHJ|8
else 3e#x)H/dr
insertSort(data, mid + 1, r - mid); >\Z lZ
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for (i = l; i <= mid; i++) { tP&{ J^G
temp = data; #)Ep(2
} PpW
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for (j = 1; j <= r - mid; j++) { RA!x
temp[r - j + 1] = data[j + mid]; "$# $f
} [SKP|`I>I
int a = temp[l]; (MZ A
int b = temp[r]; qxRT1B]{Wx
for (i = l, j = r, k = l; k <= r; k++) { Ar\IZ_Q
if (a < b) { `MN&(!&C*
data[k] = temp[i++]; { +i; e]c
a = temp; Wh#os,U$
} else { \Mobq
data[k] = temp[j--]; x&mz-
b = temp[j]; ?FkQe~FN{
} FcuEeca
} 5JJg"yuY"
} v'mJ~tz
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/** gt].rwo"
* @param data @h ,h=X
* @param l g?k#wj1uH
* @param i 6)tB{:h&~0
*/ UXcH";*9b
private void insertSort(int[] data, int start, int len) { a!s.850@
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); wa-_O<
} NgDZ4&L
} O=4ceEmz
} X^?|Sz<^E
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}