归并排序: K -E`y
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package org.rut.util.algorithm.support; JN^bo(kb
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import org.rut.util.algorithm.SortUtil; _80ns&q
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/** 2FT-}w0;
* @author treeroot AfE%a-;:
* @since 2006-2-2 ZYKd
* @version 1.0 G+C}<S}
*/ n_;S2KM
public class MergeSort implements SortUtil.Sort{ ,aO@.<"
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/* (non-Javadoc) msG3~@q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) j0?>w{e
*/ J0qXtr%h\
public void sort(int[] data) { V/&o]b
int[] temp=new int[data.length]; 8r^j P.V
mergeSort(data,temp,0,data.length-1); r#I>_Utsy
} 2fP~;\AP
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private void mergeSort(int[] data,int[] temp,int l,int r){ "OJr*B
int mid=(l+r)/2; _#(s2.h~J
if(l==r) return ; Y eO-gY[b
mergeSort(data,temp,l,mid); #^;s<YZ`
mergeSort(data,temp,mid+1,r); 4tnjXP8
for(int i=l;i<=r;i++){ ;_p fwa4
temp=data; \CwtX(6.
} %O_t`wz
int i1=l; &%:*\_2s
int i2=mid+1; _/Tlqzp
for(int cur=l;cur<=r;cur++){ 5%'S
if(i1==mid+1) V^vLN[8_\
data[cur]=temp[i2++]; g
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else if(i2>r) z+Z%H#9e
data[cur]=temp[i1++]; _Z.;u0Zp8
else if(temp[i1] data[cur]=temp[i1++]; khS/'b
else q xSs
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data[cur]=temp[i2++]; OaNc9c"
} <vLdBfw&N
} i :EO(`
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} ooDdV
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改进后的归并排序: IadK@?X6j
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package org.rut.util.algorithm.support; ex=)H%_|
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import org.rut.util.algorithm.SortUtil; zM\IKo_"
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/** n5 >B LtY
* @author treeroot 9PCa*,
* @since 2006-2-2 q
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* @version 1.0 bZK+9IR
*/ |yU3Kt
public class ImprovedMergeSort implements SortUtil.Sort { +/(|?7i@
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private static final int THRESHOLD = 10; IuDT=A
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/* 1oB$u!6P
* (non-Javadoc) LVoyA/F
* $)l2G;&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Pm;I3r=R\
*/ u(8~4P0w
public void sort(int[] data) { F6DxvyANr
int[] temp=new int[data.length]; {9 Db9K^
mergeSort(data,temp,0,data.length-1); *afejjW[
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private void mergeSort(int[] data, int[] temp, int l, int r) { m}rh|x/?
int i, j, k; X;(oz]tr$
int mid = (l + r) / 2; 3]!h{_:u
if (l == r) YK7 \D:
return; @OY1`EuO
if ((mid - l) >= THRESHOLD) V*>73I
mergeSort(data, temp, l, mid); {dZ!I
else t(wZiK}
insertSort(data, l, mid - l + 1); L%k67>
if ((r - mid) > THRESHOLD) 98h :X %
mergeSort(data, temp, mid + 1, r); VZt;P%1;h
else \u{Jf'g
insertSort(data, mid + 1, r - mid); r)c+".0d^
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for (i = l; i <= mid; i++) { An/>05|
temp = data; 9}.,2JE
} {uEu>D$8
for (j = 1; j <= r - mid; j++) { Z4\tY^NI
temp[r - j + 1] = data[j + mid]; +{S Maq
} %l%=Dkss
int a = temp[l]; 6W]OpM
int b = temp[r]; \)p4okpR
for (i = l, j = r, k = l; k <= r; k++) { 3Hy%SN(
if (a < b) { :a=ro2NH
data[k] = temp[i++]; N/(ofy
a = temp; Z(l9>A7!
} else { %Fs*#S
data[k] = temp[j--]; !~?W \b\:
b = temp[j]; 8I<_w4fC
} >).@Nb;e
} ZUv
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} =kwb`
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/** 3L?WTS6(u
* @param data H U:1f)aa
* @param l '_k >*trV
* @param i ful]OLV+
*/ hcd!A5
private void insertSort(int[] data, int start, int len) { <zfO1~^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); =VCi8jDkP
} /]pX8
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} _RN/7\
} ) )fDOJ
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}