归并排序: _6Ex}`fyJ
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package org.rut.util.algorithm.support; ,2*^G;J1
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import org.rut.util.algorithm.SortUtil; >9?BJv2
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/** *qh$,mp>
* @author treeroot [1Os.G2
* @since 2006-2-2 ^M51@sXI7
* @version 1.0 I $5*Puy#
*/ IUK!b2!`
public class MergeSort implements SortUtil.Sort{ +y}4^3Vx^
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/* (non-Javadoc) EUVB>%P
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d-cK`pSB
*/ ="M7F0k
public void sort(int[] data) { 0O_acO4
int[] temp=new int[data.length]; \I3={ii0
mergeSort(data,temp,0,data.length-1); ]7#@lL;'0
} wF@mHv
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private void mergeSort(int[] data,int[] temp,int l,int r){ Hh|a(Zq,
int mid=(l+r)/2; O&ur|&v
if(l==r) return ; ue YBD]3'
mergeSort(data,temp,l,mid); >'qkW$-95
mergeSort(data,temp,mid+1,r); Dg:2*m_!j{
for(int i=l;i<=r;i++){ 4 nIs+
temp=data; l}#z#L2,`
} Hcts^zm2u
int i1=l; T~*L[*F0
int i2=mid+1; KINKq`Sx
for(int cur=l;cur<=r;cur++){ i;' kQ
if(i1==mid+1) >Ei-Spy>Xl
data[cur]=temp[i2++]; vai.w-}Z
else if(i2>r) )2 Omsh
data[cur]=temp[i1++]; %`o3YR
else if(temp[i1] data[cur]=temp[i1++]; uude<d"U
else .H.#W1`
data[cur]=temp[i2++]; ~-1!?t/%
} d;Uzl1;
} pO2Y'1*
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} ]["=K!la:
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改进后的归并排序: Sk'S`vH
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package org.rut.util.algorithm.support; 4V$DV!dPQ}
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import org.rut.util.algorithm.SortUtil; Hl@)j
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/** K
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* @author treeroot dc ]+1
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* @since 2006-2-2 01UEd8
* @version 1.0 09_L^'`
*/ |'C{nTX
public class ImprovedMergeSort implements SortUtil.Sort { 6?"k&O
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private static final int THRESHOLD = 10; 6NvdFss'A{
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/* sz5&P )X
* (non-Javadoc) > @Ux8#
* -ZmccT" 8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O{sb{kk
*/ n+C,v.X
public void sort(int[] data) { LLa72HW
int[] temp=new int[data.length]; 3C=|
mergeSort(data,temp,0,data.length-1); L_3undy,
} #0i] g)
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private void mergeSort(int[] data, int[] temp, int l, int r) { $m.e}`7SF!
int i, j, k; c<'Pt4LY
int mid = (l + r) / 2; Z+zx*(X
if (l == r) >bKN$,Qen
return; b~M3j&
if ((mid - l) >= THRESHOLD) b
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mergeSort(data, temp, l, mid); !,f#oCL
else rUb`_ W@
insertSort(data, l, mid - l + 1); JWu^7}@~=
if ((r - mid) > THRESHOLD) ^>g7Kg"0
mergeSort(data, temp, mid + 1, r); |{KZ<
else ,ZVC@P,L
insertSort(data, mid + 1, r - mid); -I#]#i@gX
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for (i = l; i <= mid; i++) { {x$h K98
temp = data; Dm,*G`Js
} }d,iA FG
for (j = 1; j <= r - mid; j++) { ^,Paih
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temp[r - j + 1] = data[j + mid]; Y#'?3
} lP4A?J+Q
int a = temp[l]; jKOjw#N
int b = temp[r]; y~&R(x~w
for (i = l, j = r, k = l; k <= r; k++) { uP'x{Pr)
if (a < b) { *3S./C}
data[k] = temp[i++]; l9U^[;D
a = temp; $oefG}h2
} else { 9~6FWBt
data[k] = temp[j--]; ^Fy{Q*p`(
b = temp[j]; DI P(
} G8m:]!
} (6xrs_ea
} C?UV3
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/** 0;*1g47\
* @param data h\ZnUn_J
* @param l 1:3I G=
* @param i <f
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*/ DP rFB y
private void insertSort(int[] data, int start, int len) { |<,!K;@
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); MKad
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} W9!EjXg
} 2#sJ`pdQ
} tgu}^TfKkg
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}