归并排序: pjX')i<
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package org.rut.util.algorithm.support; nr<&j#!L
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import org.rut.util.algorithm.SortUtil; G>0S(M)
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/** }x1*4+Y1
* @author treeroot r z%=qY
* @since 2006-2-2 y2eeE CS]
* @version 1.0 Awad!_VdHS
*/ n.$wW
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public class MergeSort implements SortUtil.Sort{ C.$`HGv
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/* (non-Javadoc) lvz&7Z b
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7:t
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*/ bqAv)2
public void sort(int[] data) {
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int[] temp=new int[data.length]; Ue<Y ~A
mergeSort(data,temp,0,data.length-1); ~Xg@,?Zr
} PuhFbgxy
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private void mergeSort(int[] data,int[] temp,int l,int r){ "p~1|?T
int mid=(l+r)/2; ,IW$XD
if(l==r) return ; :8bz+3p
mergeSort(data,temp,l,mid); u;Q'xuo3
mergeSort(data,temp,mid+1,r); ?B2 T'}~
for(int i=l;i<=r;i++){ ^L(}c O
temp=data; t*zBN!Wu_
} fr%}|7
int i1=l; KN;b+`x;M
int i2=mid+1; Yl+r>+^
for(int cur=l;cur<=r;cur++){ 6XO%l0dC.
if(i1==mid+1) gekW&tRie
data[cur]=temp[i2++]; +_HPZo
else if(i2>r) lk6*?EJ
data[cur]=temp[i1++]; mzz77i
else if(temp[i1] data[cur]=temp[i1++]; 1B;sSp.>
else ui,#AZQ#{4
data[cur]=temp[i2++]; Fa$ pr`
} s:UQ~p}"S
} vb-L "S?kC
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} a(Bo.T<2@
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改进后的归并排序: ?3"bu$@8
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package org.rut.util.algorithm.support; fo$iV;x`
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import org.rut.util.algorithm.SortUtil; L\8tqy.
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/** vIrLG1EK
* @author treeroot uuzDu]Gwu
* @since 2006-2-2 kn_%'7
* @version 1.0 `RUr/|S
*/ O&=?,zLO[
public class ImprovedMergeSort implements SortUtil.Sort { 93yJAao9
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private static final int THRESHOLD = 10; 2P8JLT*Tj
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/*
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* (non-Javadoc) O^I~d{M 5I
* Z'PE^ ,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }'dnL
*/ pO$`(+q[
public void sort(int[] data) { qx<`Kc4
int[] temp=new int[data.length]; h[%`'(
mergeSort(data,temp,0,data.length-1); '+NmHu:q
} W{l+_a{/9
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private void mergeSort(int[] data, int[] temp, int l, int r) { *plsZ*Q8
int i, j, k; p%CAicn
int mid = (l + r) / 2; 3uCC_Am
if (l == r) B2%)G$B
return; ="RDcf/
if ((mid - l) >= THRESHOLD) b&A+`d
mergeSort(data, temp, l, mid); u4NMJnX
else Aj.TX%}`h
insertSort(data, l, mid - l + 1); Deq~"
if ((r - mid) > THRESHOLD) FGBPhH% (8
mergeSort(data, temp, mid + 1, r); =Z iyT$p
else 3@?#4]D{'
insertSort(data, mid + 1, r - mid); Y4}!9x
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for (i = l; i <= mid; i++) { 9j:t}HV
temp = data; ;Aiuy{<
} &}VGC=F;d
for (j = 1; j <= r - mid; j++) { 7am ._K
temp[r - j + 1] = data[j + mid]; 4s~YqP{K
} fQlR;4QX]
int a = temp[l]; RyC]4QyC
int b = temp[r]; (1%u`#5n-N
for (i = l, j = r, k = l; k <= r; k++) { s<|.vVi"
if (a < b) { e//28=OH
data[k] = temp[i++]; Vp\BNq_!s
a = temp; CTbdY,=B
} else { \szx.IZT
data[k] = temp[j--]; M5HKRLt
b = temp[j]; bT*MJ7VVm
} K_oBSa`
} JSt%L|}Y
} 6gJy<a3
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/** j./3 )
* @param data /d9I2~}B
* @param l S3i%7f^C?N
* @param i sAfSI<L_
*/ cfMj^*I
private void insertSort(int[] data, int start, int len) { NwoBM6 #
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Fd2Eq&:en$
} nM34zVy
} "3LOL/7f
} t=NPo+fm
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}