归并排序: `uRf*-
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package org.rut.util.algorithm.support; {=]1]IWt
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import org.rut.util.algorithm.SortUtil; 3m1]Ia-9
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/** P} =eR
* @author treeroot |)'gQvDM
* @since 2006-2-2 a o_A%?Ld
* @version 1.0 lLD-QO}/
*/ nNe`?TS?f
public class MergeSort implements SortUtil.Sort{ B{IYVviiP
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/* (non-Javadoc) C~\/FrO?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @R+bR<}]
*/ \Kh@P*7
public void sort(int[] data) { \@]/ks=K
int[] temp=new int[data.length]; 9$0-UUCk
mergeSort(data,temp,0,data.length-1); s':fv[%
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private void mergeSort(int[] data,int[] temp,int l,int r){ jn+NX)9
int mid=(l+r)/2; /0 |niiI
if(l==r) return ; E8]PV,#xY
mergeSort(data,temp,l,mid); 2q2;Uo`"S.
mergeSort(data,temp,mid+1,r); Al?LO;$Pa?
for(int i=l;i<=r;i++){ s^nPSY!
temp=data; ni @Mqb
} CV<@Rgoa
int i1=l; q7id?F}3&
int i2=mid+1; I{Pny/d`
for(int cur=l;cur<=r;cur++){ /rRQ*m_
if(i1==mid+1) b}P5*}$:9"
data[cur]=temp[i2++]; cp|&&q
else if(i2>r) ![O@{/
data[cur]=temp[i1++]; IEb"tsel
else if(temp[i1] data[cur]=temp[i1++]; K*&?+_v
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else F^iv1b
data[cur]=temp[i2++]; F_Q,j]0
} \L14rQ
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改进后的归并排序: lLuAZoH
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package org.rut.util.algorithm.support; !oXA^7Th6]
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import org.rut.util.algorithm.SortUtil; ?H9F"B$a
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/** {.7ve<K
* @author treeroot ?L|Jc_E
* @since 2006-2-2 X8T7(w<0%f
* @version 1.0
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*/ A:"J&TbBx
public class ImprovedMergeSort implements SortUtil.Sort { YM9oVF-
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private static final int THRESHOLD = 10; -la~p~8
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/* 1\d$2N"
* (non-Javadoc) \FOX#|i)
* W'{q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g%w@v$
*/
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public void sort(int[] data) { zT}Q rf~
int[] temp=new int[data.length]; :=#*[H
mergeSort(data,temp,0,data.length-1); >/Z#{;kOz
} Meh?FW||5
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private void mergeSort(int[] data, int[] temp, int l, int r) { W%]sI n
int i, j, k; 6p/gvpZ
int mid = (l + r) / 2; 7lpd$Y
if (l == r) aE^tc'h~
return; \K 01F
if ((mid - l) >= THRESHOLD) g
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mergeSort(data, temp, l, mid); dG{`Jk
else pk'@!|g%=
insertSort(data, l, mid - l + 1); w $7J)ngA9
if ((r - mid) > THRESHOLD) an3HKfv
mergeSort(data, temp, mid + 1, r); NF=FbvNe
else /p')
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insertSort(data, mid + 1, r - mid); @]f"X>
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for (i = l; i <= mid; i++) { n<:/ X tE
temp = data; #)%N+Odnr
} zOq~?>Ms6
for (j = 1; j <= r - mid; j++) { )@Yp;=l
temp[r - j + 1] = data[j + mid]; f}bUuQrH-!
} ]>@;
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int a = temp[l]; l;>#O
int b = temp[r]; V"VWHAu*.w
for (i = l, j = r, k = l; k <= r; k++) { 3OHP-oa.
if (a < b) { 9frx 60
data[k] = temp[i++]; r
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a = temp; -"5x? \.{m
} else { o}5:vi]
data[k] = temp[j--]; Yfy6o6*:
b = temp[j]; 3Z'{#<1>^;
} ]
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} ?Gl'-tV
} I=hgfo
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/** e4NT
* @param data @6GM)N\{[
* @param l *Kt7"J
* @param i uqZLlP#
*/ bl\44VK2'
private void insertSort(int[] data, int start, int len) { $X5~9s1Wl
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); -mZo`
} ?{q w
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} vnz.81OR
} ,$3
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}