归并排序: \cUNsB5
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package org.rut.util.algorithm.support; 7=WT69,&
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import org.rut.util.algorithm.SortUtil; `[)YEgs
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/** _m'Fr
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* @author treeroot ^1aAjYFn
* @since 2006-2-2 ReI/]#Us
* @version 1.0 Hp|_6hO 2
*/ 4 G-wd
public class MergeSort implements SortUtil.Sort{ fhp<oe>D
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/* (non-Javadoc) #=f?0UTA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >wBJy4:
*/ V=V:SlS9|
public void sort(int[] data) { (?{MEwHG
int[] temp=new int[data.length]; Q[I=T&
mergeSort(data,temp,0,data.length-1); j|%HIF25
} ); dT_
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private void mergeSort(int[] data,int[] temp,int l,int r){ jvFTR'R)=
int mid=(l+r)/2; M:3h e
if(l==r) return ; vIwCJN1C
mergeSort(data,temp,l,mid); :1^R9yWA4
mergeSort(data,temp,mid+1,r); A"D,Kg
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for(int i=l;i<=r;i++){ b7tOo7a H)
temp=data; : b~6i%b
} [4C:r!
int i1=l; [uls8
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int i2=mid+1; u1PaHgi$
for(int cur=l;cur<=r;cur++){ &c%g
if(i1==mid+1) &PK\|\\2
data[cur]=temp[i2++]; Q|L9gz[?
else if(i2>r) rJ{O(n]j
data[cur]=temp[i1++];
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else if(temp[i1] data[cur]=temp[i1++]; )ZqJh
else #w-xBM
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data[cur]=temp[i2++]; tAte)/0C
}
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} .dQQoyR+O
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} ;Uu(zhbj
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改进后的归并排序: F[[TWf/
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package org.rut.util.algorithm.support; Yf~{I-|`q
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import org.rut.util.algorithm.SortUtil; i?e`:}T
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/** oK%K}{`
* @author treeroot *9c!^$V
* @since 2006-2-2 hk;7:G
* @version 1.0 eT8}
*/ IGFR4+
public class ImprovedMergeSort implements SortUtil.Sort { :`2=@ .
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private static final int THRESHOLD = 10; s)2fG\1
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/* B0!"A
* (non-Javadoc) S (N\cw$
* %T9 sz4V
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0}xFD6{X
*/
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public void sort(int[] data) { e$uiJNS2
int[] temp=new int[data.length]; 0,Y5KE{
mergeSort(data,temp,0,data.length-1); GMZv RAui
} j"@93D~
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private void mergeSort(int[] data, int[] temp, int l, int r) { j>/ ,$H
int i, j, k; U Gpu\TB
int mid = (l + r) / 2; x5WW--YR+
if (l == r) 4[-*~C|W5
return; p6XtTx
if ((mid - l) >= THRESHOLD) xvSuPP4 m
mergeSort(data, temp, l, mid); &gE 75B
else mA@Me7m}
insertSort(data, l, mid - l + 1); P?]aWJ
if ((r - mid) > THRESHOLD)
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mergeSort(data, temp, mid + 1, r); y&= ALx@
else wL^%w9q-
insertSort(data, mid + 1, r - mid); t/PlcV_M"
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for (i = l; i <= mid; i++) { 5pRV3K{H
temp = data; tpTAeQ*:d
} %F*|;o7 s
for (j = 1; j <= r - mid; j++) { .pvV1JA'
temp[r - j + 1] = data[j + mid]; @M8|(N%
} T!}[yW
int a = temp[l]; 4~OQhiJ
int b = temp[r]; KyO8A2'U
for (i = l, j = r, k = l; k <= r; k++) { "h7tnMS
if (a < b) { /Y2/!mU</
data[k] = temp[i++]; ?[MsQQd~
a = temp; `[YngYw
} else {
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data[k] = temp[j--]; C}*cx$.
b = temp[j]; ,*@AX>
} LR,7,DH$9'
} \OpoBXh
} F("#^$
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/** |uH%6&\
* @param data "uPy,<l
* @param l xT)psM'CL
* @param i -sMyt HH.
*/ ?n\*,{9
private void insertSort(int[] data, int start, int len) { HOp-P8z
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); U\?g*
} X{-9FDW
} kV Rn`n0
} $Vv}XMxw
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}