归并排序: d.7Xvx0Yww
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package org.rut.util.algorithm.support; W`PK9juu
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import org.rut.util.algorithm.SortUtil; DT=!
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/** YSuwV)Y
* @author treeroot !HXdUAKu
* @since 2006-2-2 ^/Hj^4~_U
* @version 1.0 hfvs'.
*/ -BV&u(
public class MergeSort implements SortUtil.Sort{ Lh &L5p7
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/* (non-Javadoc) _W:
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) qvOBvUR}
*/ OD"eB?
public void sort(int[] data) { EMH?z2iGd
int[] temp=new int[data.length]; @ %z5]w
mergeSort(data,temp,0,data.length-1); ?.A6HrAPB
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private void mergeSort(int[] data,int[] temp,int l,int r){ P|.KMtG
int mid=(l+r)/2; -X4`,0y%{O
if(l==r) return ; >?e*;f$VdJ
mergeSort(data,temp,l,mid); n X
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mergeSort(data,temp,mid+1,r); 9GZF39w u
for(int i=l;i<=r;i++){ qc\o>$-:`
temp=data; 4PUM.%
} CSU> nIE0
int i1=l; gr=ke #
int i2=mid+1; Dz)bP{iq"
for(int cur=l;cur<=r;cur++){ 2
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if(i1==mid+1) ==(M
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data[cur]=temp[i2++]; 1'_OM h*;
else if(i2>r) q#\eL~k
data[cur]=temp[i1++]; '~ ]b;nA
else if(temp[i1] data[cur]=temp[i1++]; kd\G>
else .^kTb2$X
data[cur]=temp[i2++]; >5 5/@+^
} `bC_J,>_
} F"23>3
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} )QZ?Bf
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改进后的归并排序: tOko %vY8
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package org.rut.util.algorithm.support; h V8A<VT
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import org.rut.util.algorithm.SortUtil; _ve7Is`/
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/** 3 oWCQ
* @author treeroot "J{,P9P6
* @since 2006-2-2 4t8 Hy
* @version 1.0 fCVSVn"o
*/ *smo{!0Gg
public class ImprovedMergeSort implements SortUtil.Sort { L,kF]
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private static final int THRESHOLD = 10; aVtwpkgZ
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/* /cjf 1Dc
* (non-Javadoc) WD)[Ac[
* IaF79}^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vMI \$E&
*/ ]jYl:41yI
public void sort(int[] data) { ]JM9 ^F
int[] temp=new int[data.length]; \m.{^Xd~
mergeSort(data,temp,0,data.length-1); )t.q[O`
} ?D~uR2+Z
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private void mergeSort(int[] data, int[] temp, int l, int r) { (HJ60Hj
int i, j, k; IWQ8e$N
int mid = (l + r) / 2; kR_[p._
if (l == r) D6m>>&E['
return; Cv=0&S.
if ((mid - l) >= THRESHOLD) 6Rt pB\hq
mergeSort(data, temp, l, mid); bIhL!Ty T.
else [zfGDMG&
insertSort(data, l, mid - l + 1); C/$IF M<
if ((r - mid) > THRESHOLD) Av[jFk
mergeSort(data, temp, mid + 1, r); a&<<X:$Hy
else 4q~E\l|.5
insertSort(data, mid + 1, r - mid); bC{~/ JP
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for (i = l; i <= mid; i++) { j?,$*Fi
temp = data; ["7}u^z@<+
} n#R!`*[
for (j = 1; j <= r - mid; j++) { GQQ!3LwP\O
temp[r - j + 1] = data[j + mid]; WV% KoM,%
} ^m7PXY
int a = temp[l]; -_}EQ9Q
int b = temp[r]; WZr~Pb9
for (i = l, j = r, k = l; k <= r; k++) { 'SY&-<t(
if (a < b) { *!Dzst-J3
data[k] = temp[i++]; (/M c$V
a = temp; A4^+p0@
} else { rx"zqm9 }u
data[k] = temp[j--]; oMVwIdf
b = temp[j]; JB|I/\(A
} : ?V;
} s6$3[9Vh&9
} gM*s/,;O"
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/** anvj{1
* @param data :U9R
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* @param l 3%} Ma,
* @param i GxkG$B
*/ s*IfXv
private void insertSort(int[] data, int start, int len) { A0XFu}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); {G}HZv%S U
} :QVGY^c
} g{%';
} u!i5Q
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}