归并排序: oS 7 q#`
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package org.rut.util.algorithm.support; \hai
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import org.rut.util.algorithm.SortUtil; a[Ah
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/** @Hw#O33/'
* @author treeroot =Bcwd7+
* @since 2006-2-2 "-C.gqoB
* @version 1.0 Y #E/"x%+
*/ RZ#b)l
public class MergeSort implements SortUtil.Sort{ 5<wIJ5t
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/* (non-Javadoc) F.i*'x0u
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~2@+#1[g8z
*/ LX[<Wh_X(
public void sort(int[] data) { \b95CU
int[] temp=new int[data.length]; .K]n<+zW
mergeSort(data,temp,0,data.length-1); "_WOtJr
} : KhAf2A
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private void mergeSort(int[] data,int[] temp,int l,int r){ &}_ $@
int mid=(l+r)/2; lQj3#!1}
if(l==r) return ; R*VRxQ,h6+
mergeSort(data,temp,l,mid); 87l(a,#J
mergeSort(data,temp,mid+1,r); 62TWqQ!9d
for(int i=l;i<=r;i++){ [v( \y
temp=data; Q '/v-bd?o
} /FJ )gQYA
int i1=l; /Fy2ZYs,`8
int i2=mid+1; b-ZC~#?|b
for(int cur=l;cur<=r;cur++){ R".~{6
if(i1==mid+1) Yj)H!Cp.xD
data[cur]=temp[i2++]; 0}}b\!]9
else if(i2>r) mlW0ptp
data[cur]=temp[i1++]; 0Mpc#:a%1
else if(temp[i1] data[cur]=temp[i1++]; ))- B`vi
else :l~Wt7R
data[cur]=temp[i2++]; eLWD?-v%
} _;/onM
} LI1OocY.]
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改进后的归并排序: qIIc>By(\"
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package org.rut.util.algorithm.support; `1k0wT(
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import org.rut.util.algorithm.SortUtil; MWTzJGRT
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/** vncLB&@7
* @author treeroot V_+XZ+7Lx}
* @since 2006-2-2 zV {_dO
* @version 1.0 5q4sxY9T
*/ t M?3oO
public class ImprovedMergeSort implements SortUtil.Sort { :j feY
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private static final int THRESHOLD = 10; ;%wQnhg
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/* _=l8e-6r
* (non-Javadoc) 3"afrA
* 12r]"?@|s
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |:)UNb?R"O
*/ 1 ? be
public void sort(int[] data) { sg0HYb%_E
int[] temp=new int[data.length]; 1@" L
mergeSort(data,temp,0,data.length-1); 7HfA{.|m
} L
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private void mergeSort(int[] data, int[] temp, int l, int r) { o&WKk5$
int i, j, k; s.y wp{EF
int mid = (l + r) / 2; =, kH(rp2
if (l == r) >wx1M1
return; Q|T9tc->
if ((mid - l) >= THRESHOLD) tA;#yM;
mergeSort(data, temp, l, mid); /A$mP)}tz
else yvN;|R
insertSort(data, l, mid - l + 1); +'aG&^k4
if ((r - mid) > THRESHOLD) (b!`klQ
mergeSort(data, temp, mid + 1, r); mtfEK3?2*
else NABVU0}
insertSort(data, mid + 1, r - mid); nz-( 8{ae
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for (i = l; i <= mid; i++) { V% -wZL/
temp = data; o&-c5X4
} =XAFW
for (j = 1; j <= r - mid; j++) { (.D|%P
temp[r - j + 1] = data[j + mid]; BuwJR
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} =6Z$nc
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int a = temp[l]; #>)OLKP
int b = temp[r]; ?mM6[\DFoT
for (i = l, j = r, k = l; k <= r; k++) { lHl1Ny\?
if (a < b) { ZDffR:An
data[k] = temp[i++]; Km/#\$|}
a = temp; nG Bjxhl
} else { tUzef
data[k] = temp[j--]; gxa@da
b = temp[j]; V'n4iM
} ~#
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} (Qf"|3R4
} d9bc>5%-F
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/** cHr.7 w
* @param data uPZ<hG#K
* @param l 78o>UWA:
* @param i Fkq;Q
*/ 0{0A,;b
private void insertSort(int[] data, int start, int len) { 6KpG,%2L#
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); b`%(.&
} /U1"P
} w]-,X`
} H<YhO&D*u
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}