归并排序: L}a-c(G+8
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package org.rut.util.algorithm.support; DEw>f%&4
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import org.rut.util.algorithm.SortUtil; 4^Y{ BS fF
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/** { )-8P
* @author treeroot xWnOOE$i
* @since 2006-2-2 &.l^> #
* @version 1.0 jP{&U&!i
*/ ,r8#-~A6,A
public class MergeSort implements SortUtil.Sort{ Gl"|t't(
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/* (non-Javadoc) 21$E.x 6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ![i)_XO
*/ 85T"(HhT
public void sort(int[] data) { ZuFcJ?8i
int[] temp=new int[data.length]; ZXIw^!8@/
mergeSort(data,temp,0,data.length-1); M>_vsI^I'
} 8c\\-{
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private void mergeSort(int[] data,int[] temp,int l,int r){ Qhq' %LR
int mid=(l+r)/2; 'Qh1$X)R7a
if(l==r) return ; @-ml=S7;Sz
mergeSort(data,temp,l,mid); 1Q/=s,{u
mergeSort(data,temp,mid+1,r); !-t,r%CG
for(int i=l;i<=r;i++){ U`aB&[=$
temp=data; "<"m}rE?Q
} PjD9D.
int i1=l; #;yxn.</
int i2=mid+1; bksv2@ar
for(int cur=l;cur<=r;cur++){ Fw S>V2R
if(i1==mid+1) 5a-x$Qb9
data[cur]=temp[i2++]; W,|+Dl
else if(i2>r) !Ii[`H
data[cur]=temp[i1++]; wRvh/{xB
else if(temp[i1] data[cur]=temp[i1++]; >J5C .hx
else :r(dMU3%
data[cur]=temp[i2++]; Ptc+ypTu
} Mj{w/'
} 1ysQvz
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改进后的归并排序: ;=7K*npT
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package org.rut.util.algorithm.support; V2!0),]B
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import org.rut.util.algorithm.SortUtil; \{}dn,?Fv
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/** f1]zsn:
* @author treeroot lXg5UrW
* @since 2006-2-2 'zM=[#!B
* @version 1.0 mU]VFPr5
*/ +J|H~`
public class ImprovedMergeSort implements SortUtil.Sort { 0$]iRE;O]
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private static final int THRESHOLD = 10; |mP};&b
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/* f"KrPx!^b
* (non-Javadoc) 1$8@CT^m
* m`9nDiV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &iInru3
*/ 1_<x%>zG
public void sort(int[] data) { h~m,0nGO
int[] temp=new int[data.length]; 'Y /0:)
mergeSort(data,temp,0,data.length-1); 4;I\%qes
} ujRXAN@mC
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private void mergeSort(int[] data, int[] temp, int l, int r) { 4WJY+)
int i, j, k; qx'0(q2Ii(
int mid = (l + r) / 2; ^3TNj
if (l == r) Y@`uBB[
return; rNR7}o~ qo
if ((mid - l) >= THRESHOLD) ~PI2G9
mergeSort(data, temp, l, mid); H;
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else $uZmIu9Bi+
insertSort(data, l, mid - l + 1); bAPMD
if ((r - mid) > THRESHOLD) Td'Mc-/
mergeSort(data, temp, mid + 1, r); -B H/)$-$
else 3l~+VBR_
insertSort(data, mid + 1, r - mid); 16zRe I(
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for (i = l; i <= mid; i++) { :Ln)j%&
temp = data; r*+~(83k
} ^o{{kju
for (j = 1; j <= r - mid; j++) { ,7LfvZj4[
temp[r - j + 1] = data[j + mid]; 1EXT^2!D
} {+WBi(=W
int a = temp[l]; Lw}-oE
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int b = temp[r]; (N}-]%#
for (i = l, j = r, k = l; k <= r; k++) { |Dn Zk3M,
if (a < b) { -K 'UXoU1
data[k] = temp[i++]; !+%gJiu:
a = temp; NX&dJ
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} else { $6a9<&LP_
data[k] = temp[j--]; )2Ei<
b = temp[j]; |%C2 cx
} t1Fqq4wRi
} 2y
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} 8Yh'/,o=L#
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/** L5bq\
* @param data ?6CLUu|7n
* @param l 7|5kak>=
* @param i o8R_Ojh
*/ i1cd9
private void insertSort(int[] data, int start, int len) { l+9RPJD/:
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ;k!.ey$S
} g8Ex$,\,
} {Dpsr` &
} )#m{"rk[x,
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}