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package org.rut.util.algorithm.support; SM8f"H28
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import org.rut.util.algorithm.SortUtil; <v6W
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/** Te%V+l
* @author treeroot k4PXH
* @since 2006-2-2 a>Wr2gPko
* @version 1.0 *X5<]{7c
*/ Kzx`
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public class MergeSort implements SortUtil.Sort{ /_X`i[
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/* (non-Javadoc) Hqtv`3g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -^Qm_lN
*/ <naxpflom0
public void sort(int[] data) { iA<'i8$P
int[] temp=new int[data.length]; R=<%!
mergeSort(data,temp,0,data.length-1); 4,08`5{
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private void mergeSort(int[] data,int[] temp,int l,int r){ klAvi%^jE
int mid=(l+r)/2; *xjP^y":
if(l==r) return ; ~h:(9q8NLC
mergeSort(data,temp,l,mid); OZ33w-X<
mergeSort(data,temp,mid+1,r); 9#>nFs"H
for(int i=l;i<=r;i++){ #KNl<V+c}1
temp=data; 0|<9eD\I=
} F9"Xu-g
int i1=l; Z~w2m6;s
int i2=mid+1; O!t=,F1j
for(int cur=l;cur<=r;cur++){ IhN^*P:Fo
if(i1==mid+1) LzxO=+=9!q
data[cur]=temp[i2++]; 8|(],NyEJ
else if(i2>r) ~{GTL_w
data[cur]=temp[i1++]; ^/VnRpU
else if(temp[i1] data[cur]=temp[i1++]; {+]tx46$
else j#U,zsv:
data[cur]=temp[i2++]; p~NHf\
} ][KlEE>W2
} (_]!}N
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改进后的归并排序: xs&xcRR"
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package org.rut.util.algorithm.support; k }{o:
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import org.rut.util.algorithm.SortUtil; PCHKH
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/** CG95ScrX
* @author treeroot J$PlI
* @since 2006-2-2 F9Af{*Jw?x
* @version 1.0 4K\o2p?4
*/ !9{UBAh
public class ImprovedMergeSort implements SortUtil.Sort { O._\l?m
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private static final int THRESHOLD = 10; %ZcS"/gf
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/* f[
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* (non-Javadoc) )dFPfu&HL
* *VmX.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +hKs
*/ `!spi=f
public void sort(int[] data) { =av0a!
int[] temp=new int[data.length]; ;l1.jQh
mergeSort(data,temp,0,data.length-1); B;S'l|-?
} #
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private void mergeSort(int[] data, int[] temp, int l, int r) { vaJl}^T
int i, j, k; ^BM !TQ%!
int mid = (l + r) / 2; TtF+~K
if (l == r) lT*@f39~g
return; ][b|^V
if ((mid - l) >= THRESHOLD) ^|=P9'4Th
mergeSort(data, temp, l, mid); LF
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else PU[<sr#,
insertSort(data, l, mid - l + 1); ^^zj4 }On?
if ((r - mid) > THRESHOLD) * nFzfV
mergeSort(data, temp, mid + 1, r); e(N},s:_
else BU4IN$d0Po
insertSort(data, mid + 1, r - mid); "GR*d{
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for (i = l; i <= mid; i++) { f,F1k9-1!
temp = data; W/%hS)75
} [& Z-
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for (j = 1; j <= r - mid; j++) { iE}] E
temp[r - j + 1] = data[j + mid]; I 44]W &
} i]N<xcF9N*
int a = temp[l]; w@&z0ODJ
int b = temp[r]; I`*5z;Q!%@
for (i = l, j = r, k = l; k <= r; k++) { S0Io$\ha
if (a < b) { kz1#"8Zd!
data[k] = temp[i++]; /a<UKh:A[
a = temp; U<Tv<7`
} else { [*Ai@:F
data[k] = temp[j--]; Vfga%K%l F
b = temp[j]; y631;dU
} 934j5D
} +7o1&D*v
} P3]K'*Dyd
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/** NmXRA(m
* @param data &A*E)T#>#
* @param l %\(-<aT
* @param i |(ab0b #
*/ qJ(uak
private void insertSort(int[] data, int start, int len) { K#N9N@W jR
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Il9xNVos#
} _/z_
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} vPGUE`!D+
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}