归并排序: N2xgyKy~
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package org.rut.util.algorithm.support; B1J+`R3OX
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import org.rut.util.algorithm.SortUtil; ;]+kC
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/** 2}'&38wMT
* @author treeroot >"N \ZC^
* @since 2006-2-2 4|7L26,]5
* @version 1.0 1&U'pp|T
*/ rJKX4,M
public class MergeSort implements SortUtil.Sort{ DJT)7l {
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/* (non-Javadoc) !Kd/
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *+lnAxRa?
*/ @ U:WWTzf
public void sort(int[] data) { sw8Ic\vT
int[] temp=new int[data.length]; o#Rao#bD:
mergeSort(data,temp,0,data.length-1); __'Z0?.4#
} F2OU[Z,-]
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private void mergeSort(int[] data,int[] temp,int l,int r){ b]Oc6zR,,~
int mid=(l+r)/2; }a-ikFQ]
if(l==r) return ; <`~]P$
mergeSort(data,temp,l,mid); "EQ}xj
mergeSort(data,temp,mid+1,r); h$4V5V
for(int i=l;i<=r;i++){ x(}@se
temp=data; k;l^wM
} qS+'#Sn
int i1=l; !\RR UH*
int i2=mid+1; ^4c2}>f
for(int cur=l;cur<=r;cur++){ `Nc3I\tCM
if(i1==mid+1) kVe}_[{m
data[cur]=temp[i2++]; l4v)tV~
else if(i2>r) %[&cy'
data[cur]=temp[i1++]; 2lE {
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else if(temp[i1] data[cur]=temp[i1++]; 64o`7
else Td
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data[cur]=temp[i2++]; >LwAG:Ud
} GVCyVt[!-
} Et# }XVCJ
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} ir3iW*5k
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改进后的归并排序: 1h"0B
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package org.rut.util.algorithm.support; VS1gg4tCv
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import org.rut.util.algorithm.SortUtil; MoO
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/** NJLU+byU
* @author treeroot d #y{eV$Q
* @since 2006-2-2 {;=+#QK/
* @version 1.0 nLJ]tpw^DH
*/ h:Npi
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public class ImprovedMergeSort implements SortUtil.Sort { =+A8s$Pb
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private static final int THRESHOLD = 10; <),FI <~
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/* ]%"Z[R
* (non-Javadoc) ~|R"GloUw
*
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) UIIunA9
*/ C Vyq/X
public void sort(int[] data) { dD@T}^j *|
int[] temp=new int[data.length]; sW@4r/F>:D
mergeSort(data,temp,0,data.length-1); (E\7Ui0Q
} +twJHf_U
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private void mergeSort(int[] data, int[] temp, int l, int r) { 2gg5:9
int i, j, k; F#O.i,
int mid = (l + r) / 2; ^L*:0P~
if (l == r) kG@1jMPtQ
return; T[~ak"M
if ((mid - l) >= THRESHOLD) QJvA
mergeSort(data, temp, l, mid); \E]s]ft;+
else +.b~2K1
insertSort(data, l, mid - l + 1); gj$gqO`B
if ((r - mid) > THRESHOLD) #0hX)7(j
mergeSort(data, temp, mid + 1, r); w!8h4U.
;
else [{f{E
insertSort(data, mid + 1, r - mid); &z&Jl#t-)
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for (i = l; i <= mid; i++) { ~?+Jt3?,
temp = data; "((6)U#
} c
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for (j = 1; j <= r - mid; j++) { s:i$ s")
temp[r - j + 1] = data[j + mid]; (B7M*e
} f:=q=i
int a = temp[l]; }V6}>!Sb
int b = temp[r]; 9iUkvnphh
for (i = l, j = r, k = l; k <= r; k++) { |JnJ=@-y
if (a < b) { 6 @'v6 1'
data[k] = temp[i++]; vAHJP$x
a = temp; =Q[5U9
} else { Go+f0aig
data[k] = temp[j--]; ){icI<
b = temp[j]; | t3_E
} q71Tg
} ;,'eO i
} $l 0^2o=
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/** j""u:l^+x
* @param data zT0FTAl^
* @param l /c]I|$v
* @param i MJ4+|riB
*/ oypX.nye_
private void insertSort(int[] data, int start, int len) { bUU_NqUf*3
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); `+Wl
fk;
} .
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} s)8g4Yc*
} 2{|
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}