归并排序: kSDa\l!W]
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package org.rut.util.algorithm.support; $6&GAJe
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import org.rut.util.algorithm.SortUtil; e"s {_V
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/** C`th^dqBV
* @author treeroot ",aT<lw.
* @since 2006-2-2 qp~4KukL
* @version 1.0 Sv~1XL W
*/ sRe#{EuJ
public class MergeSort implements SortUtil.Sort{ Q!2iOvK
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/* (non-Javadoc) s?G'l=CcKu
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jQ_|z@OV
*/ 5nxS+`Pn.)
public void sort(int[] data) { N9JgV,`
int[] temp=new int[data.length]; M8",t{7
mergeSort(data,temp,0,data.length-1); 8NAWA3^B
} bUAR<R'E
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private void mergeSort(int[] data,int[] temp,int l,int r){ X.T\=dm%v
int mid=(l+r)/2; LcpyW=)}"V
if(l==r) return ; %M;_(jda
mergeSort(data,temp,l,mid); \A3>c|
mergeSort(data,temp,mid+1,r); x(3
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for(int i=l;i<=r;i++){ THbtu*El
temp=data; 32bkouq
} ]g8i>,G
int i1=l; pT
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int i2=mid+1; ;( Ajf.i
for(int cur=l;cur<=r;cur++){ gGI#QPT`X
if(i1==mid+1) [nN\{"~O
data[cur]=temp[i2++]; \Sq"3_m4T
else if(i2>r) Vr/` \441
data[cur]=temp[i1++]; ZXsY-5$#d-
else if(temp[i1] data[cur]=temp[i1++]; 1hMX(N&|
else =~W0 ~lxX
data[cur]=temp[i2++]; -|k&L}\OB0
} S4{ Mu(^xT
} HV$9b~(
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改进后的归并排序: Kixr6\
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package org.rut.util.algorithm.support; DQ n`@
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import org.rut.util.algorithm.SortUtil; P"V{y|2
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/** 68J 9T^84
* @author treeroot /XW&q)z-Hl
* @since 2006-2-2 /mMAwx
* @version 1.0 F; MF:;mM
*/ z*dQIC
public class ImprovedMergeSort implements SortUtil.Sort { e0~sUVYf
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private static final int THRESHOLD = 10; %eutfM-?6
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/* \&\_>X.,
* (non-Javadoc) 20.-;jK
* ;Txv-lfS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) u6iU[5
*/ (/"K+$8'
public void sort(int[] data) { nI` f_sp
int[] temp=new int[data.length]; =$)4:
mergeSort(data,temp,0,data.length-1); 6=G~6Qu
} 5M<'A=
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private void mergeSort(int[] data, int[] temp, int l, int r) { nL":0!DTRD
int i, j, k; ]< s\V-y
int mid = (l + r) / 2; R%Ui6dCLo
if (l == r) `FzYvd"N
return; d4y9AE@k
if ((mid - l) >= THRESHOLD) FUyB"-<
mergeSort(data, temp, l, mid); f.aB?\"f6
else Uw2,o|=O
insertSort(data, l, mid - l + 1); |b$>68:
if ((r - mid) > THRESHOLD) kvW|=
mergeSort(data, temp, mid + 1, r); BrlzN='j}
else gnQo1q{ 4
insertSort(data, mid + 1, r - mid); [5?4c'Ev
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for (i = l; i <= mid; i++) { tb:,Uf>E
temp = data; M('s|>\l
} ?Y?gzD
for (j = 1; j <= r - mid; j++) { (kWSK:l
temp[r - j + 1] = data[j + mid]; QQg8+{>
} *PSvHXNi
int a = temp[l]; V-KL%
int b = temp[r]; bH\'uaJ
for (i = l, j = r, k = l; k <= r; k++) {
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if (a < b) { biK)&6|`sa
data[k] = temp[i++]; ;ZQ-uz
a = temp; D00G1:Ft(T
} else { ^wx%CdFm'P
data[k] = temp[j--]; ~ON1Zw[+
b = temp[j]; *#&k+{a^2
} |^7f\.oF
} 8sN#e(@
} V=j-Um;
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/** K3vseor
* @param data v229H<
* @param l _ztZ>'
* @param i ,op]-CY5
*/ g>2aIun_Q
private void insertSort(int[] data, int start, int len) { ==QWwPpA
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); !c3```*
} EMVk:Vt]
} 1R0ffP]
} r\$6'+Si
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}