归并排序: Wn5xX5H C
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package org.rut.util.algorithm.support; ~U1M-<IX
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import org.rut.util.algorithm.SortUtil; 2(25IYMS8
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/** :F?L,I,K
* @author treeroot E$s?)
* @since 2006-2-2 $q0i=l&$&
* @version 1.0 FTcXjWBPF9
*/ 9zlhJ7i
public class MergeSort implements SortUtil.Sort{ B=|m._OL]n
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/* (non-Javadoc) =o_zsDv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (gF{S*`
*/ }!jn%@_y@
public void sort(int[] data) { *q0vp^?
int[] temp=new int[data.length]; |I s"ov
mergeSort(data,temp,0,data.length-1); +H
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} C |P(,Xp
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private void mergeSort(int[] data,int[] temp,int l,int r){ 7-4S'rq+
int mid=(l+r)/2; Wcf;ZX
if(l==r) return ; S^zt>
mergeSort(data,temp,l,mid); p~evPTHnrX
mergeSort(data,temp,mid+1,r); K|ZB!oq
for(int i=l;i<=r;i++){ #Rj&PzBe
temp=data; h1U8z)D#
} X:Iam#H
int i1=l; tDj/!L`
int i2=mid+1; kc:>[ {9
for(int cur=l;cur<=r;cur++){ [" PRxl
if(i1==mid+1) YD@n8?~$$
data[cur]=temp[i2++]; LJ{P93aq`^
else if(i2>r) {;2Gl $\r
data[cur]=temp[i1++]; D=^|6}
else if(temp[i1] data[cur]=temp[i1++]; i^Ip+J+[
else kp=wz0#
data[cur]=temp[i2++]; ?]]7PEee*
} 0;/},B[A
} -|WQs'%O
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改进后的归并排序: B*AF8wX|
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package org.rut.util.algorithm.support; .dQEr~f #}
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import org.rut.util.algorithm.SortUtil; C?h}n4\B^?
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/** 7O]$2
* @author treeroot \pwg8p[4Q
* @since 2006-2-2
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* @version 1.0 _q1b3)`D
*/ ;X}!;S%K
public class ImprovedMergeSort implements SortUtil.Sort { d#>iFD+
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private static final int THRESHOLD = 10; i9=*ls^Cx
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/* >J['so2Bf
* (non-Javadoc) s+@`Z*B5
* &~&nJr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?(2^lH~6h
*/ QG8X{'
public void sort(int[] data) { *,y .%`o
int[] temp=new int[data.length]; 7@u:F?c
mergeSort(data,temp,0,data.length-1); 8Ben}j)H
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private void mergeSort(int[] data, int[] temp, int l, int r) { 0w9[Z
int i, j, k; tGVC"a
int mid = (l + r) / 2; M\L^ Wf9
if (l == r) c-".VF
return; V")u
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if ((mid - l) >= THRESHOLD) 'p> *4}
mergeSort(data, temp, l, mid); gu|cQ2xV
else Qs
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insertSort(data, l, mid - l + 1); wxW\L!@
if ((r - mid) > THRESHOLD) NA-)7i*>J
mergeSort(data, temp, mid + 1, r); {[Z}<#n)
else I?~iEO\nh
insertSort(data, mid + 1, r - mid); ;cfmMt!QWJ
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for (i = l; i <= mid; i++) { W*jwf@
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temp = data; 4lsg%b6_%,
} 3?Tk[m1b
for (j = 1; j <= r - mid; j++) { rL3 f%L
temp[r - j + 1] = data[j + mid]; M
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int a = temp[l]; X0&[cyP!
int b = temp[r]; t{g7 :A
for (i = l, j = r, k = l; k <= r; k++) { >21f%Z
if (a < b) { n~C!PXE
data[k] = temp[i++]; 3{ FUFx
a = temp; En:/{~9{F
} else { |9x H9@^f
data[k] = temp[j--]; >og-
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b = temp[j]; '\4 @
} 0sGAC
} E,$5V^
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} +S
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/** RA^-Pa.O
* @param data :+Okv$v4
* @param l k:sFI @g
* @param i (N/KP+J$n
*/ 2nkUvb%=
private void insertSort(int[] data, int start, int len) { k*$[V17
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); E(/M?>t-
} 9TZ4ffXV*
} ,#blY~h8^
} m|%ly
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}