归并排序: @;fE%N
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package org.rut.util.algorithm.support; ZZU 8B?)
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import org.rut.util.algorithm.SortUtil; b0b9#9x
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/** U"+ ry.3`
* @author treeroot ig}e@]
* @since 2006-2-2 A+*oT(`
* @version 1.0 E`fssd~
*/ r0deBRM
public class MergeSort implements SortUtil.Sort{ i=UTc1
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/* (non-Javadoc) 1[BvHOI2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3DAGW"F
*/ uq4sbkP
public void sort(int[] data) { 2A}u qaF
int[] temp=new int[data.length]; AaYrVf 9!
mergeSort(data,temp,0,data.length-1); 0@K:Tq-mF
} B21AcE
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private void mergeSort(int[] data,int[] temp,int l,int r){ G'2=jHzMF
int mid=(l+r)/2; fG2&/42J
if(l==r) return ; (kQ.tsl
mergeSort(data,temp,l,mid); (+LR u1z
mergeSort(data,temp,mid+1,r); qH
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for(int i=l;i<=r;i++){ ^:!(jiH
temp=data; @xm~T|[7
} 'e>sHL
int i1=l; P%`R7yk
int i2=mid+1; Ik5jwfz
for(int cur=l;cur<=r;cur++){ s#4ew}
if(i1==mid+1) Zng` oFD
data[cur]=temp[i2++]; iQ!
else if(i2>r) 7ml0
data[cur]=temp[i1++]; G0QXf
else if(temp[i1] data[cur]=temp[i1++]; DIqT>HHZ
else NhoS7 y(
data[cur]=temp[i2++]; fuD1U}c
} .Spi$>v
} QHzX
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} {vT55i<mk
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改进后的归并排序: DV[ Jbl:)
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package org.rut.util.algorithm.support; 5uV"g5?w
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import org.rut.util.algorithm.SortUtil; 6G<Hi"I
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/** :gD0EqV
* @author treeroot k<'vP{
* @since 2006-2-2 /GuSIZg"_
* @version 1.0 ;2Ad])
*/ ju^"vw
public class ImprovedMergeSort implements SortUtil.Sort { 5Vqmv<F;$Z
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private static final int THRESHOLD = 10; ;WS7.
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/* (>LHj]}K
* (non-Javadoc) sMfFm@\ N
* IN|i)?rh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,-7/]h,l
*/ OHP3T(Q5
public void sort(int[] data) { {|5$1v
int[] temp=new int[data.length]; j,56Lh%1
mergeSort(data,temp,0,data.length-1); Vr-3M+l=O
} L`\`NNQC
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private void mergeSort(int[] data, int[] temp, int l, int r) { Wl !!5\
int i, j, k; Y!a+#N!
int mid = (l + r) / 2;
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if (l == r) t$y&=v
return; !HR2Rf l
if ((mid - l) >= THRESHOLD) lNaez3
mergeSort(data, temp, l, mid); Ie2w0Cs28
else Xrj(,|
insertSort(data, l, mid - l + 1); =tf@4_
if ((r - mid) > THRESHOLD) [)H,zpl
mergeSort(data, temp, mid + 1, r); 11B{gUv.]
else Y-%l7GErhL
insertSort(data, mid + 1, r - mid); mF*?e/
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for (i = l; i <= mid; i++) { Y*kh$E%<#
temp = data; DYAwQ"i;6
} Pv7f
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for (j = 1; j <= r - mid; j++) { -yl4tW
temp[r - j + 1] = data[j + mid]; 3%[)!zKv
} miG;]-"^
int a = temp[l]; -; us12SZ
int b = temp[r]; z^P* :
for (i = l, j = r, k = l; k <= r; k++) { B;z>Dd,Y_x
if (a < b) { npO@Haw
data[k] = temp[i++]; vNC$f(cQ
a = temp; =wIdC3Ph
} else { yp[<9%Fi
data[k] = temp[j--]; dT hn?
b = temp[j]; d^Zo35X
} >?>u bM`,
} Q$?7) yyu+
} 7cUR.PI#Q
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/** s<Ex"+
* @param data ReI=4Jq11
* @param l 5w,lw
* @param i *or2
*/ NIGB[2V(
private void insertSort(int[] data, int start, int len) { L876$
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); $ ]W[y=
} LsJs Q
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} yN 9$gfJC^
} <OR.q
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}