归并排序: ItYG9a
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package org.rut.util.algorithm.support; O7s0M?4
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import org.rut.util.algorithm.SortUtil; 1
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/** g}ciG!0
* @author treeroot xfkG&&
* @since 2006-2-2 '[qG ,^f
* @version 1.0 'bY^=9&|
*/ ;l4rg!r(S
public class MergeSort implements SortUtil.Sort{ u5V<f;
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/* (non-Javadoc) ?F
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qAR~js`5
*/ eU@yw1N
public void sort(int[] data) { U6jlv3
int[] temp=new int[data.length]; -CtA\<7I
mergeSort(data,temp,0,data.length-1); BB--UM{7
} %lv2 ;-
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private void mergeSort(int[] data,int[] temp,int l,int r){ |A'8 'z&q
int mid=(l+r)/2; R!*UU'se
if(l==r) return ; bt%k;Z]
mergeSort(data,temp,l,mid); f@\
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mergeSort(data,temp,mid+1,r); v{Zh!mk* L
for(int i=l;i<=r;i++){ >p\IC
temp=data; 0z#+^
} }=s@y"["
int i1=l; ukS@8/eJ
int i2=mid+1; Bwb3@vNA
for(int cur=l;cur<=r;cur++){ %L/Wc,My
if(i1==mid+1) ppb]RN|)
data[cur]=temp[i2++]; wA.YEI|CSj
else if(i2>r) 4)JrOe&k
data[cur]=temp[i1++]; *N\U{)b\
else if(temp[i1] data[cur]=temp[i1++]; zclt2?
else j[wGR_EE
data[cur]=temp[i2++]; wXuHD<<
} _m3PAD4
} s,K @t_J
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改进后的归并排序: U
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package org.rut.util.algorithm.support; cFGP3Q4{
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import org.rut.util.algorithm.SortUtil; Ywr^uy1V,/
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/** J24UUZ9&$
* @author treeroot H&mw!=FV0
* @since 2006-2-2
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* @version 1.0 J^n(WnM*F
*/ J%j#gyTU
public class ImprovedMergeSort implements SortUtil.Sort { 0@*rp7
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private static final int THRESHOLD = 10; f]T#q@|lE
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/* U>:CX
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* (non-Javadoc) `U2Z(9le
* ^B?{X|U37
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,GVHwTZ0`
*/ kSB)}q6a
public void sort(int[] data) { L)8;96
int[] temp=new int[data.length]; ?*[t'D9f-
mergeSort(data,temp,0,data.length-1); wd..{j0&
} 9Hlu%R
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private void mergeSort(int[] data, int[] temp, int l, int r) { qIA!m
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int i, j, k; ,8+SQo#3
int mid = (l + r) / 2; !?O:%QG
if (l == r) )"t=sFxaB
return; bC?t4-W
if ((mid - l) >= THRESHOLD) Wj.)wr!
mergeSort(data, temp, l, mid); =]-!
else c!{.BgGN
insertSort(data, l, mid - l + 1); pR`.8MMc8
if ((r - mid) > THRESHOLD) F~W*"i+EZ
mergeSort(data, temp, mid + 1, r); ,dzbI{@6
else 78dmXOZ'_h
insertSort(data, mid + 1, r - mid); .Pxb9mW
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for (i = l; i <= mid; i++) { e/#4)@]
temp = data; 1i bQ'bZ
} *bmk(%g
for (j = 1; j <= r - mid; j++) { A){kitx-i)
temp[r - j + 1] = data[j + mid]; I0m/
} /A|ofAr)
int a = temp[l]; "^22Y}VB
int b = temp[r]; ;\4}Hcg
for (i = l, j = r, k = l; k <= r; k++) { 5 xTm]
if (a < b) { _V-@95fK
data[k] = temp[i++]; u"X8(\pOn
a = temp; ?P{C=Td2z
} else { P1Re7/
data[k] = temp[j--]; 47`{ e_YP0
b = temp[j]; t!D=oBCro
} 9co
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} *v l_3S5_
} HmbTV(lC
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/** m]7Y
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* @param data cCyg&% zsT
* @param l qL A
* @param i F ypqf|
*/ MI',E?#yB
private void insertSort(int[] data, int start, int len) { 4\Y=*X
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); [RC|W%<Z>
} I>L
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} jqb,^T|j;m
} Zu&trxnNf[
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}