归并排序: 2E~WcB
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package org.rut.util.algorithm.support; );T0n
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import org.rut.util.algorithm.SortUtil; y]|Hrx
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/** eELJDSd
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* @author treeroot ~`'!nzP5H
* @since 2006-2-2 6&~8TH
* @version 1.0 ; MU8@?yN
*/ uC{qaMQ
public class MergeSort implements SortUtil.Sort{ *a_U2}N
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/* (non-Javadoc) +X[+SF)!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2xBIfmR^y
*/ nY(>|!
public void sort(int[] data) { ovv<7`
int[] temp=new int[data.length]; Vfkm{*t)
mergeSort(data,temp,0,data.length-1); ]dzBm!u
} 3vx5dUgl,
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private void mergeSort(int[] data,int[] temp,int l,int r){ ^%(HZ'$wC
int mid=(l+r)/2; u{#}Lo>B #
if(l==r) return ; %@/"BF;r
mergeSort(data,temp,l,mid); 5,/rh,?
mergeSort(data,temp,mid+1,r); A-5xgp,
for(int i=l;i<=r;i++){ <a9<rF =r
temp=data; =l6aSr
} 32yGIRV
int i1=l; ?y1']GAo
int i2=mid+1; y
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for(int cur=l;cur<=r;cur++){ Y+il>.Z
if(i1==mid+1) USF9sF0l
data[cur]=temp[i2++]; '@4Myg* b
else if(i2>r) 0$RZ~
data[cur]=temp[i1++]; l=EnK"aU
else if(temp[i1] data[cur]=temp[i1++]; kKbq?}W[
else TJk3z^.j
data[cur]=temp[i2++]; Ul"9zTH
} ;U7o)A;
} p
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改进后的归并排序: ckn0I
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package org.rut.util.algorithm.support; E
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import org.rut.util.algorithm.SortUtil; &BF97%E2
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/** b02V#m;Z
* @author treeroot QaAA@l
* @since 2006-2-2 ;/ wl.'GA
* @version 1.0 >"LHr&;m&h
*/ Ynn:,
public class ImprovedMergeSort implements SortUtil.Sort { L7kNQ/
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private static final int THRESHOLD = 10; zL8Z8eh">
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/* n $Nw/Vm
* (non-Javadoc) !H)$_d \uj
* o%EzK;Df
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &,v-AL$:Q
*/ qq
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public void sort(int[] data) { TJYup%q
int[] temp=new int[data.length]; =sm<B^yj
mergeSort(data,temp,0,data.length-1); (Dat`:
} &Hz{
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private void mergeSort(int[] data, int[] temp, int l, int r) { ko-3`hX`
int i, j, k; Ux[2 +Cf
int mid = (l + r) / 2; `efC4#*!!
if (l == r) H1bHQB
return; tLH:'"{zx
if ((mid - l) >= THRESHOLD) _\/KI
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mergeSort(data, temp, l, mid); %fbV\@jDCX
else }Z="}Dg|T
insertSort(data, l, mid - l + 1); (M0"I1g|w
if ((r - mid) > THRESHOLD) &7\=Jw7w
mergeSort(data, temp, mid + 1, r); +N6IdDN3
else Q,ezAE
insertSort(data, mid + 1, r - mid); eeVDU$*e=
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for (i = l; i <= mid; i++) { 0sMNp
temp = data; Ob ~7w[n3
} r5RUgt
for (j = 1; j <= r - mid; j++) { v9,<2
temp[r - j + 1] = data[j + mid]; ]iU8n (5f
} lr*p\vH
int a = temp[l]; jj,CBNo(
int b = temp[r]; GyC/39<P
for (i = l, j = r, k = l; k <= r; k++) { ,59G6o
if (a < b) { ._E 6?
data[k] = temp[i++]; aM7e?.rU
a = temp; Y9/`w@"v
} else { n1!}d%:
data[k] = temp[j--]; bmOK8
b = temp[j]; 8t;vZ&
} R7o'V* d
} =:M/hM)#
} CL|d>
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/** ~xa yGk
* @param data l`bl^~xRo
* @param l U#iGR5&^3
* @param i 4-CGe
*/ !.G knDT
private void insertSort(int[] data, int start, int len) { }ed{8"bj
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); |C"zK
} :@RX}rKG
} dc dVB>D
} :hBLi99
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}