归并排序: Cta!"=\
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package org.rut.util.algorithm.support; $)7Af6xD
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import org.rut.util.algorithm.SortUtil; ,jMV
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/** d6"B_,*b
* @author treeroot 15!b]':
* @since 2006-2-2 `wNJ*`
* @version 1.0 i$4lBy_2
*/ q<A,S8'm
public class MergeSort implements SortUtil.Sort{ H=5#cPI#(^
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/* (non-Javadoc) E=~Ahkg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ZmJHLn[B
*/ |1Ko5z
public void sort(int[] data) { ^Kh>La:>O
int[] temp=new int[data.length]; `O}bPwa{>
mergeSort(data,temp,0,data.length-1); %gXNWxv
} bqUQadDB
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private void mergeSort(int[] data,int[] temp,int l,int r){ x`p3I*_HT5
int mid=(l+r)/2;
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if(l==r) return ; "RsH'`
mergeSort(data,temp,l,mid); yykyvy
mergeSort(data,temp,mid+1,r); 7:&a,nU
for(int i=l;i<=r;i++){ 8R.`*
temp=data; D{s4Bo-
} 3S1`av(tD
int i1=l; w7h=vy n?
int i2=mid+1; zy[|4Q(?
for(int cur=l;cur<=r;cur++){ |c!lZo/
if(i1==mid+1) 2&U<Wiu\}
data[cur]=temp[i2++]; R)qK{wq(1E
else if(i2>r) pXHeUBY.
data[cur]=temp[i1++]; &E8fd/s=k
else if(temp[i1] data[cur]=temp[i1++]; Hxd^oE
else 8__C T
data[cur]=temp[i2++]; 4$b9<:M_
} SQx:`{O
} 7j%sM&
}@wXm
} DR#[\RzNI
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改进后的归并排序: Dv+:d 4|"
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package org.rut.util.algorithm.support; z50f$!?
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import org.rut.util.algorithm.SortUtil; 2E}^'o
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/** @5(HRd
* @author treeroot `pd1'5Hm
* @since 2006-2-2 ;V3d"@R,
* @version 1.0 `o!a
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*/ +)K yG
public class ImprovedMergeSort implements SortUtil.Sort { {v}jV{'^um
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private static final int THRESHOLD = 10; BXo9s~5Q
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/* Fgg4QF
* (non-Javadoc) _d/ZaCx'i
* ,@*`2I>`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #n}n
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*/ mPo] .z
public void sort(int[] data) { _a=f.I
int[] temp=new int[data.length]; \78kShx
mergeSort(data,temp,0,data.length-1); T?E[LzZg
} y7#4Mcc`~
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private void mergeSort(int[] data, int[] temp, int l, int r) { XG}pp`{o
int i, j, k; W'9=st'
int mid = (l + r) / 2; }\/f~?tEh
if (l == r) 7?JcB?G4
return; }D eW2Jp
if ((mid - l) >= THRESHOLD) m=2e1wc
mergeSort(data, temp, l, mid); /I&b5Vp
else =Z(#j5TGvH
insertSort(data, l, mid - l + 1); Bh,LJawE
if ((r - mid) > THRESHOLD) tC -H2@
mergeSort(data, temp, mid + 1, r); da&f0m U
else _Uz}z#jt
insertSort(data, mid + 1, r - mid); CVFsp>+
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for (i = l; i <= mid; i++) { :j2_Jn4UP
temp = data; kpN'H_ .
} .U !;fJ9
for (j = 1; j <= r - mid; j++) { 3
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temp[r - j + 1] = data[j + mid]; 3M&75OE
} 4';tMiz
int a = temp[l]; >, }m=X8
int b = temp[r]; K06/ D!RD4
for (i = l, j = r, k = l; k <= r; k++) { yw;!KUKb|
if (a < b) { ".SQ*'Oc
data[k] = temp[i++]; 6Pa
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a = temp; QP e}rQnm
} else { S[ ,r.+
data[k] = temp[j--]; C&'Y@GE5
b = temp[j]; N]sX
r
} Ma3Hn
} dj76YK
} [Pt5c6 L:
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/** P!";$]+
* @param data g3%t+>$*
* @param l ^OQ#N z
* @param i 9bT,=b;
*/ :8aIj_qds
private void insertSort(int[] data, int start, int len) { rkl/5z??
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); y|X\f!
} &7X0 ;<
} O"mU#3?
} 5aTyM_x
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}