归并排序: Ck?: 8YlF
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package org.rut.util.algorithm.support; vq1&8=
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import org.rut.util.algorithm.SortUtil; <>_WdAOuD
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/** -QDgr`%5
* @author treeroot ~b0qrjF;O
* @since 2006-2-2 i&)C,
* @version 1.0 A#&qoZ(C
*/ Ir #V2]$
public class MergeSort implements SortUtil.Sort{ z D<9A6AB
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/* (non-Javadoc) "b4iOp&:=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (L%q/$
*/ u V7Hsg9l
public void sort(int[] data) { u^%')Ncp
int[] temp=new int[data.length]; /}_c7+//
mergeSort(data,temp,0,data.length-1); q}Z
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} 7G/|e24
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private void mergeSort(int[] data,int[] temp,int l,int r){ p]Zabky
int mid=(l+r)/2; tY'QQN||
if(l==r) return ; #%b()I_([
mergeSort(data,temp,l,mid); XS8~jBjx
mergeSort(data,temp,mid+1,r); j9'XZq}
for(int i=l;i<=r;i++){
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temp=data; -i5g 8t'
} **w~
int i1=l; O7'3}P;
int i2=mid+1; k=2l9C3Z
for(int cur=l;cur<=r;cur++){ Cf[F`pFM
if(i1==mid+1) Gj`Y2X2r
data[cur]=temp[i2++]; cE5Zxcn
else if(i2>r) ?^ezEpW
data[cur]=temp[i1++]; h./vTNMc
else if(temp[i1] data[cur]=temp[i1++]; )=nPM`Jn.
else !r
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data[cur]=temp[i2++]; /(ju
} O) %kl
} [.xk
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} =v$s+`cP
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改进后的归并排序: "UGj4^1f
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package org.rut.util.algorithm.support; Z !25xqNCd
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import org.rut.util.algorithm.SortUtil; p]z54 ~
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/** Ny,A#-?
* @author treeroot MI'l4<>u
* @since 2006-2-2 m_02"'
* @version 1.0 tO>OD#
*/ 2$zq (
public class ImprovedMergeSort implements SortUtil.Sort { a&
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private static final int THRESHOLD = 10; vLFaZ^(
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/* i2a"J&,6O
* (non-Javadoc) L_1_y, 0N
* [2 w<F[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]q[
*/ \*!%YTZ~
public void sort(int[] data) { w+q;dc8
int[] temp=new int[data.length]; agm5D/H]:
mergeSort(data,temp,0,data.length-1); e$+f~~K
} a05:iFoJ
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private void mergeSort(int[] data, int[] temp, int l, int r) { xT?} wF
int i, j, k; <C"N X
int mid = (l + r) / 2; ,x"yZ
if (l == r) R5&$h$[/
return; ->2wrOH|H
if ((mid - l) >= THRESHOLD) %^?3s5PXD
mergeSort(data, temp, l, mid); vs])%l%t
else <Z:8~:@
insertSort(data, l, mid - l + 1); pebx#}]p-
if ((r - mid) > THRESHOLD) |k
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mergeSort(data, temp, mid + 1, r); @W\4UX3dK
else ddq 1NW
insertSort(data, mid + 1, r - mid); l&??2VO/t
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for (i = l; i <= mid; i++) { P[I*%
temp = data; kH8$nk eev
} "K+N f
for (j = 1; j <= r - mid; j++) { vgA!?P3
temp[r - j + 1] = data[j + mid]; acYoOW1G
} +V);'"L
int a = temp[l]; *- IlF]
int b = temp[r]; RJ}yf|d-C
for (i = l, j = r, k = l; k <= r; k++) { 5Jhbf2-
if (a < b) { ?+,*YVT
data[k] = temp[i++]; RTgA[O4J
a = temp; ^o6)[_L
} else { SXo[[ao
data[k] = temp[j--]; 3pTS@
b = temp[j]; O`[iz/7m
} yEpN,A
} 8LQ59K_WX
} a j@C0
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/** $dZ>bXUw:
* @param data 5} MlZp
* @param l ELrZ8&5G
* @param i &!DZW5
*/ F;Q_*0mIQ
private void insertSort(int[] data, int start, int len) { ()nKug`.@
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); j*H;a ?Y
} \5_P5q:`
} uO _,n
} FJd8s*
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}