归并排序: nn_j"Nu
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package org.rut.util.algorithm.support; j@b4)t
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import org.rut.util.algorithm.SortUtil; ZrFC#wJb
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/** }$ Am;%?p
* @author treeroot :d<;h:^_
* @since 2006-2-2 217KJ~)'
* @version 1.0 -)tu$W*
*/ \Podyh/;?
public class MergeSort implements SortUtil.Sort{ ^.J
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/* (non-Javadoc) aMFUJrXo
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~sQN\]5VW
*/ ;?i(WV}ee
public void sort(int[] data) { YQ_3[[xT
int[] temp=new int[data.length]; cFoDR
mergeSort(data,temp,0,data.length-1); ^V~rS8]gj
} RYaf{i`
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private void mergeSort(int[] data,int[] temp,int l,int r){ V(Ps6jR"BS
int mid=(l+r)/2; rQbL86+
if(l==r) return ; t,.MtU>K@
mergeSort(data,temp,l,mid); $Rsf`*0-
mergeSort(data,temp,mid+1,r); hb"t8_--c
for(int i=l;i<=r;i++){ gC#PqK~
temp=data; xh\{ dUPA
} Y$ ;C@I
int i1=l; ']+ -u{+#
int i2=mid+1; 1Q6WpS
for(int cur=l;cur<=r;cur++){ e1X*}OI
if(i1==mid+1) z1ltc{~Z
data[cur]=temp[i2++]; O=#FpPHrdw
else if(i2>r) g`!:7|&,_
data[cur]=temp[i1++]; {@9y%lmrh
else if(temp[i1] data[cur]=temp[i1++]; 0=;jGh}|i
else ++:v O
data[cur]=temp[i2++]; 31y=Ar""
} ubIGs|p2c
} Cd#>,,\z
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} jl=<Q.Mm7
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改进后的归并排序: /GNRu
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package org.rut.util.algorithm.support; A:EF#2)g
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import org.rut.util.algorithm.SortUtil; s,Cm}4L6
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/** \c+)Y}:D
* @author treeroot IBWUeB:b
* @since 2006-2-2 "2X=i`rTi
* @version 1.0 jBV2]..
*/ uRQm.8b
public class ImprovedMergeSort implements SortUtil.Sort { U%ce0z
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private static final int THRESHOLD = 10; <$n%h/2%
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/* mk1;22o{TX
* (non-Javadoc) H>e?FDs0*R
* F9ry?g=h
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) x{C=r dp__
*/ ?MuM _6
public void sort(int[] data) { qu8i Jq
int[] temp=new int[data.length]; REhXW_x
mergeSort(data,temp,0,data.length-1); 2"NRnCx*
} LKG],1n-
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private void mergeSort(int[] data, int[] temp, int l, int r) { ~!'%m(g
int i, j, k; #H(|+WEu
int mid = (l + r) / 2; )]!Ps` ,u
if (l == r) rB}UFS)
return; [syuoJ
if ((mid - l) >= THRESHOLD) 0b=OK0n!%
mergeSort(data, temp, l, mid); 3Qe:d_
else >/EmC3?b!
insertSort(data, l, mid - l + 1); _h7+.U=
if ((r - mid) > THRESHOLD) dZRz'd
mergeSort(data, temp, mid + 1, r); f
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else L._I"g5 H9
insertSort(data, mid + 1, r - mid); Nm#VA.~
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for (i = l; i <= mid; i++) { AL}c-#GG
temp = data; Xd66"k\b+
} e%j+,)Ry
for (j = 1; j <= r - mid; j++) { :KZI+
temp[r - j + 1] = data[j + mid]; 7CABM
} )__vPPko i
int a = temp[l]; F$ x@]
int b = temp[r]; &Hc8u,|
for (i = l, j = r, k = l; k <= r; k++) { GdR>S('
if (a < b) { 9'Y~! vY
data[k] = temp[i++]; FqQm*k_
a = temp; 3`J?as@^8
} else { @h([c
data[k] = temp[j--]; }.4`zK&SB
b = temp[j]; e6k}-<W*q
} |t|+pBB
} z['>`Kt
} *4r
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/** WYwsTsG{_
* @param data 1fQvh/2
* @param l >ALU}o/
* @param i zrE
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*/ on(F8%]zE
private void insertSort(int[] data, int start, int len) { z}s0D]$+x
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ?.IT!M}DR
} y)|Q~8r
} E*7B5
} 4CS9vv)9R
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}