归并排序: r;&>iX4B
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package org.rut.util.algorithm.support; @FO)0
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import org.rut.util.algorithm.SortUtil; NZ0O,}m
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/** em{(4!W>
* @author treeroot 72W
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* @since 2006-2-2 !C4!LZ0A
* @version 1.0 TZR)C P5
*/ oU*45B`"
public class MergeSort implements SortUtil.Sort{ lQ' GX9hN@
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/* (non-Javadoc) yQ,{p@#X8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `Ag{)
*/ 7!WA)@6
public void sort(int[] data) { v59dh (:`Z
int[] temp=new int[data.length]; |yEa5rd?W
mergeSort(data,temp,0,data.length-1); 9h4({EE2t
} _tTN G2
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private void mergeSort(int[] data,int[] temp,int l,int r){ c2t=_aAIPQ
int mid=(l+r)/2; \R36w^c3
if(l==r) return ; F8:vDv
mergeSort(data,temp,l,mid); ?W^c4NtP
mergeSort(data,temp,mid+1,r); *37uy_EpV
for(int i=l;i<=r;i++){ y){
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temp=data; x^4xq#Bb7
} Q/>{f0
int i1=l; J &pO%Q=b
int i2=mid+1; FKNMtp[`
for(int cur=l;cur<=r;cur++){ Szbb_i{_
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if(i1==mid+1) -K9c@?
data[cur]=temp[i2++]; tg]x0#@s
else if(i2>r) ojyIQk+
data[cur]=temp[i1++]; (bsXo
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else if(temp[i1] data[cur]=temp[i1++]; ^?7`;/
else s<qe,'Y
data[cur]=temp[i2++]; 8V^oP]Y
} i;LXu%3\
} OQW#a[=WQ
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改进后的归并排序: AC>`'Gx
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package org.rut.util.algorithm.support; 0"CG7Vg,zh
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import org.rut.util.algorithm.SortUtil; N"nd*?
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/** ='`/BY(m[
* @author treeroot *h}XWB C1q
* @since 2006-2-2 $5Xh,DOg
* @version 1.0 C(00<~JC
*/ s2Mb[#:a"
public class ImprovedMergeSort implements SortUtil.Sort { UrqRx?#
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private static final int THRESHOLD = 10; ?VP8ycm
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/* xuqv6b.
* (non-Javadoc) 9 FB19
* {q"OM*L(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !o:f$6EA~C
*/ {phNds%
public void sort(int[] data) { Ney/[3 A
int[] temp=new int[data.length]; j'A_'g'^
mergeSort(data,temp,0,data.length-1); z^'gx@YD*v
} Z'"tB/=W
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private void mergeSort(int[] data, int[] temp, int l, int r) { a!=D [Gz*5
int i, j, k; i\,-oO
int mid = (l + r) / 2; r"P|dlV-
if (l == r) Wk)OkIFR
return; D)L+7N0D~
if ((mid - l) >= THRESHOLD) ~ _/(t'9
mergeSort(data, temp, l, mid); 6}d.5^7lr
else vX/T3WV
insertSort(data, l, mid - l + 1); LDPUD'
if ((r - mid) > THRESHOLD) I}1NB3>^
mergeSort(data, temp, mid + 1, r); '<"s \,
else C{U?0!^
insertSort(data, mid + 1, r - mid); }H^+A77v
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for (i = l; i <= mid; i++) { bbE!qk;hEP
temp = data; E7rDa1
} hb}+A=A=+
for (j = 1; j <= r - mid; j++) { 1`=nWy='
temp[r - j + 1] = data[j + mid]; ?8'*,bK
} f4fvrL
int a = temp[l]; LY%WD%pL
int b = temp[r]; aAD^^l#
for (i = l, j = r, k = l; k <= r; k++) { x(1:s|Uyp{
if (a < b) { I>W=x'PkLn
data[k] = temp[i++]; nLXlU*ES
a = temp; KVclhT<F
} else { T;r2.Pupn
data[k] = temp[j--]; 0Tx6zO
b = temp[j]; Ayxkv)%:@)
} dYJ(!V&
} EJMM9(DQ7
} <M+|rD]oc
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/** CsGx@\jN
* @param data 9jM}~XvV
* @param l C5o#i*|
* @param i (A9Fhun
*/ *4\:8
private void insertSort(int[] data, int start, int len) { ~vm%6CABM
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ]cHgleHQ
} =$'6(aDH
} ]_f_w9]
} D4eDHq
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}