归并排序: .hlQ?\
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package org.rut.util.algorithm.support; +F~0\#d
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import org.rut.util.algorithm.SortUtil; ;#yu"6{
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/** "gvw0)
* @author treeroot h @,e`Z
* @since 2006-2-2 LbX6p
* @version 1.0 aMvK8C%7
*/ Dyk[ug5
public class MergeSort implements SortUtil.Sort{ y^QYlZO
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/* (non-Javadoc) k g,ys4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ls>u`hG
*/ +8)]m<
public void sort(int[] data) { .eabtGO,
int[] temp=new int[data.length]; R=amKLD?
mergeSort(data,temp,0,data.length-1); 4-+ozC{
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private void mergeSort(int[] data,int[] temp,int l,int r){ [%84L@:h
int mid=(l+r)/2; $EQT"ZX>%i
if(l==r) return ; [|[sYo
mergeSort(data,temp,l,mid); > 1r[]&8
mergeSort(data,temp,mid+1,r); YNg\"XjJM<
for(int i=l;i<=r;i++){ _(6B.
temp=data; KZ!N{.Jk
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int i1=l; -Y8ks7
int i2=mid+1; H6ky)kF&
for(int cur=l;cur<=r;cur++){ H ZDaV&)@
if(i1==mid+1) {yHB2=nI
data[cur]=temp[i2++]; 0^&(u:~
else if(i2>r) RO%tuU,-
data[cur]=temp[i1++]; ;c X^8;F0
else if(temp[i1] data[cur]=temp[i1++]; [-E{}FL|
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} ;5D@kS^
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改进后的归并排序: Ld\LKwo
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package org.rut.util.algorithm.support; N[,VSO&
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import org.rut.util.algorithm.SortUtil; 1 ;\]D9i
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/** Q 7uAf3
* @author treeroot @ .Z[M
* @since 2006-2-2 +~w?Xw,
* @version 1.0 0q[p{_t`
*/ 8tLT'2+H#
public class ImprovedMergeSort implements SortUtil.Sort { {=bg5I0|a
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private static final int THRESHOLD = 10; <78$]Z2we
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/* "Ju/[#VCJ
* (non-Javadoc) k5aa>6K
* ~?AC:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O t *K+^I
*/ `26V`%bPkr
public void sort(int[] data) { 0'yG1qG
int[] temp=new int[data.length]; -E8ntY-
mergeSort(data,temp,0,data.length-1); !,? <zg
} &RKH2R
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private void mergeSort(int[] data, int[] temp, int l, int r) { p^KlH=1n.6
int i, j, k; &'5@azU
int mid = (l + r) / 2; t} *l?$`
if (l == r) JrCf,?L^
return; mL:m;>JJ n
if ((mid - l) >= THRESHOLD) 2^)D
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mergeSort(data, temp, l, mid); c*x J=Gz6d
else KInUe(g<9M
insertSort(data, l, mid - l + 1); ^&+zA,aL,A
if ((r - mid) > THRESHOLD) 7tpAZ<{
mergeSort(data, temp, mid + 1, r); qri}=du&F
else
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insertSort(data, mid + 1, r - mid); @Jb@L
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for (i = l; i <= mid; i++) { bz,Da
temp = data; 2{A;du%&
} ,|T*|2Gm
for (j = 1; j <= r - mid; j++) { (3
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temp[r - j + 1] = data[j + mid]; {S5RK-ax
} &mN'Tk
int a = temp[l]; pU?{0xZH
int b = temp[r]; yz[%MXI
for (i = l, j = r, k = l; k <= r; k++) { +1otn~(E
if (a < b) { = EQN-{#
data[k] = temp[i++]; w^06z,
a = temp; \%sPNw=e
} else { &Ki>h
data[k] = temp[j--]; yGb a
b = temp[j]; *j|/2+pq
} 5;IT64&]
} _PK}rr?"7O
} k$ZRZ{
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/** @v>l[6]>^
* @param data E%<w5d.lq
* @param l v<L=!-b^
* @param i nd.57@*M
*/
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private void insertSort(int[] data, int start, int len) { P@qMJ}<j
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 7~_{.f
} v1LKU
} `wNm%*g
} OENzG~
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}