归并排序: ~WzMK
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package org.rut.util.algorithm.support; G[ ,,L
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import org.rut.util.algorithm.SortUtil; i:MlD5 F
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/** 2Y9y5[K,F)
* @author treeroot "tqS|ok.
* @since 2006-2-2 n+v!H O"2u
* @version 1.0 X *_
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*/ :8GlyN<E
public class MergeSort implements SortUtil.Sort{ >+zAWK9
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/* (non-Javadoc) u!hqq^1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) { +i; e]c
*/ ^H
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public void sort(int[] data) { @ARAX\F
int[] temp=new int[data.length]; >ly&+3S
mergeSort(data,temp,0,data.length-1); !a.3OpQ
} W ]a7&S
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private void mergeSort(int[] data,int[] temp,int l,int r){ ;JMOsn}8
int mid=(l+r)/2; n%7A;l!{
if(l==r) return ; ?,.HA@T%
mergeSort(data,temp,l,mid); \Mobq
mergeSort(data,temp,mid+1,r); E|KLK4]
for(int i=l;i<=r;i++){ BnY\FQ)K
temp=data; V5hp
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} ?FkQe~FN{
int i1=l; N:m@D][/sW
int i2=mid+1; <|mE9u
for(int cur=l;cur<=r;cur++){ ,e}mR>i=e
if(i1==mid+1) B iVd
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data[cur]=temp[i2++]; =e"H1^Ml
else if(i2>r) gEcnn.(S
data[cur]=temp[i1++]; CD XB&%Sr
else if(temp[i1] data[cur]=temp[i1++]; mBYS"[S(
else JS<e`#c&
data[cur]=temp[i2++]; okd
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} 'XC&BWJ
} wFKuSd
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} Requ.?!fG;
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改进后的归并排序: k1~nd=p
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package org.rut.util.algorithm.support; Q'
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import org.rut.util.algorithm.SortUtil; Pf^Ly97
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/** TWl(\<&+)
* @author treeroot 3G:NZ) p
* @since 2006-2-2 ,"v)vTt
* @version 1.0 #dxJ#
*/ S)Ub/`f{s
public class ImprovedMergeSort implements SortUtil.Sort { GN~[xXJU
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private static final int THRESHOLD = 10; \4]zNV ~x
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/*
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* (non-Javadoc) _Ex*%Qf.
* Q]2sj:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) hi4h0\L!}
*/ *Bb|N--jI
public void sort(int[] data) { dA_V:HP
int[] temp=new int[data.length]; \E ? iw.}
mergeSort(data,temp,0,data.length-1); UIm[DYMS
} (}/.4xE
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private void mergeSort(int[] data, int[] temp, int l, int r) { aHVdClD2o
int i, j, k; hPEp0("
int mid = (l + r) / 2; JsWq._O{/
if (l == r) W>t&N
return; auyKLT3C
if ((mid - l) >= THRESHOLD) ?-RoqF
mergeSort(data, temp, l, mid); N4Fy8qU;
else =0!\F~
insertSort(data, l, mid - l + 1); X+'^Sp
if ((r - mid) > THRESHOLD) ,&zjOc_v
mergeSort(data, temp, mid + 1, r);
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else tNi%}~Z
insertSort(data, mid + 1, r - mid); \r1kbf7?
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for (i = l; i <= mid; i++) { ]Lb?#S
temp = data; iA^+/Lt
} }
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for (j = 1; j <= r - mid; j++) { \h'E5LO
temp[r - j + 1] = data[j + mid]; |4?}W ,
} CLFxq@%nu~
int a = temp[l]; jmk*z(}#:
int b = temp[r]; 9$\;voo
for (i = l, j = r, k = l; k <= r; k++) { Gn2bZ%l
if (a < b) { Ma*dIwEp
data[k] = temp[i++]; ^!v}
a = temp; #<PA-
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} else { 35N/v G0
data[k] = temp[j--]; 0F0Q=dZ
b = temp[j]; #)h
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} HN~v&,
} 9qu24zz$P
} %t5BB$y
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/** vwqN;|F
* @param data A 4W
* @param l l_j<aCY?|
* @param i 6E\\`FE4y
*/ |au qj2
private void insertSort(int[] data, int start, int len) { h<^:Nn
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); eV{FcJha
} ~&j`9jdOj
} mZ0oa-Iy
} kvgs $
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}