归并排序: d ]#`?}
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package org.rut.util.algorithm.support; Xo6zeLHO
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import org.rut.util.algorithm.SortUtil; EoS6t
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/** 5,\|XQA5!
* @author treeroot PWO5R]
* @since 2006-2-2 Q9Go}}n
* @version 1.0 m6Qm }""
*/ e2pFX?
public class MergeSort implements SortUtil.Sort{ 2(P<TP._E
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/* (non-Javadoc) p}Bh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Owv}lJ
*/ WHu[A/##']
public void sort(int[] data) { _:Jma
int[] temp=new int[data.length]; [ fs.D /
mergeSort(data,temp,0,data.length-1); S %wdXe
} B3I0H6O
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private void mergeSort(int[] data,int[] temp,int l,int r){ z$Qy<_l
int mid=(l+r)/2; \3hFb,/4k
if(l==r) return ; jLw|F-v-l<
mergeSort(data,temp,l,mid); -U;=]o1
mergeSort(data,temp,mid+1,r); c_aj-`BKp
for(int i=l;i<=r;i++){ jHV)
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temp=data; zhY]!
} f=Oj01Ut*
int i1=l; .\3gb6S}
int i2=mid+1; 4E$d"D5]>p
for(int cur=l;cur<=r;cur++){ \{qtdTd
if(i1==mid+1) +F>erdV
data[cur]=temp[i2++]; K?yMy,9%Yw
else if(i2>r) 7Jpq7;
data[cur]=temp[i1++]; AE Abny
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else if(temp[i1] data[cur]=temp[i1++]; <L2z| %`
else =dp`4N
data[cur]=temp[i2++]; R'oGsaPB2
} hdqr~9
} WE+Szg(4x
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} c @KNyBy2
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改进后的归并排序: &4*f28 s
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package org.rut.util.algorithm.support; N37CAbw0
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import org.rut.util.algorithm.SortUtil; rmdg~
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/** 48{B} j%oU
* @author treeroot 5fLp?`T
* @since 2006-2-2 n'1LNi
* @version 1.0 c2]h.G83
*/ l-SVI9|<0
public class ImprovedMergeSort implements SortUtil.Sort { 4y$okn\}i
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private static final int THRESHOLD = 10; hW\'EJ
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/* 7Q~$&G
* (non-Javadoc) pi/&WMZ<
* A[^k4>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) bzZ7L-yD
*/ DW)X3A(^
public void sort(int[] data) { VmZDU(M
int[] temp=new int[data.length]; OD?y
mergeSort(data,temp,0,data.length-1); ?Iag-g9#=m
} gOp81)
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private void mergeSort(int[] data, int[] temp, int l, int r) { TeyFq0j@'
int i, j, k; ~RV9'v4
int mid = (l + r) / 2; {5+ 39=(
if (l == r) Vygh|UEo
return; Gc;-zq
if ((mid - l) >= THRESHOLD) /sqfw,h@
mergeSort(data, temp, l, mid); +Q"XwxL<6
else qVvnl
insertSort(data, l, mid - l + 1); -WGlOpg0;
if ((r - mid) > THRESHOLD) fe}RmnAC
mergeSort(data, temp, mid + 1, r); LCb0Kq}*/(
else }s8xr>
insertSort(data, mid + 1, r - mid); R?J8#JPXD
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for (i = l; i <= mid; i++) { JtF)jRB0,
temp = data; {
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} i;:}{G<
for (j = 1; j <= r - mid; j++) { /)4Q%Zp
temp[r - j + 1] = data[j + mid]; {&FOa'bP
} @2>ce2+
int a = temp[l]; ]#r Nz"
int b = temp[r]; 1\/~>
for (i = l, j = r, k = l; k <= r; k++) { AU;Iif6
if (a < b) { V h5\'Sn
data[k] = temp[i++]; %Kh}6
a = temp; CM t$)
} else { z*o2jz?t4
data[k] = temp[j--]; bvT$/(7
b = temp[j]; V-"#Kf9
} !.O;SG
} SXV2Y-
} <irr.O
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/** JZqJ&
* @param data eUD 5V
* @param l m`4N1egCt
* @param i P75@Yu(
*/ gmOP8.g
private void insertSort(int[] data, int start, int len) { Ia:M+20n
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); CU/Id`"tW
} 1`Uu;mz
} WISK-z
} ~SXqhX-`
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}