归并排序: 9G"4w` P
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package org.rut.util.algorithm.support; ?"T!<L
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import org.rut.util.algorithm.SortUtil;
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/** 1f1D^|
* @author treeroot IwS<p-
* @since 2006-2-2 h?h)i>
* @version 1.0 q&O9W?E8dG
*/ !)CY\c4}d>
public class MergeSort implements SortUtil.Sort{ 7h2/8YUgQ
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/* (non-Javadoc)
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) GT80k]e.
*/ P #8+1iC1
public void sort(int[] data) { R4'>5.M
int[] temp=new int[data.length]; k {vd1,HZ
mergeSort(data,temp,0,data.length-1); XD?]+
} s<Nw)Ynw
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private void mergeSort(int[] data,int[] temp,int l,int r){ nr8#;D
int mid=(l+r)/2; HRQfT>"/
if(l==r) return ; V$:%CIn
mergeSort(data,temp,l,mid); b|may/xWH
mergeSort(data,temp,mid+1,r); %rf6>
for(int i=l;i<=r;i++){ __1Hx?f
temp=data; \TnK<83
} ~|"uuA1/#O
int i1=l; S6C DK:
int i2=mid+1; MtgY `p
for(int cur=l;cur<=r;cur++){ 2P${5WT
if(i1==mid+1) b"`Q&V.
data[cur]=temp[i2++]; Oiqc]4TL
else if(i2>r) H#WqO<<v
data[cur]=temp[i1++]; X+HPdrT
else if(temp[i1] data[cur]=temp[i1++]; 6' \M:'<0e
else wuxOFlrg
data[cur]=temp[i2++]; j|qdf3^f
} U#sv.r/L}3
} 69Z`mR
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}
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改进后的归并排序: 0F6@aQ\y3
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package org.rut.util.algorithm.support; ftRdK>a
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import org.rut.util.algorithm.SortUtil; BeD>y@ it
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/** R<hsG%BS(D
* @author treeroot X+ybgB4(
* @since 2006-2-2 cG 3tn&AXi
* @version 1.0 09 f;z
*/ }5z!FXB
public class ImprovedMergeSort implements SortUtil.Sort { #N'9F&:V$
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private static final int THRESHOLD = 10; 33a}M;vx
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/* JDp=w,7LF
* (non-Javadoc) 0R0_UvsXU
* n$h+_xN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $GQEdVSNo
*/ ^JY:$)4["
public void sort(int[] data) { .b!HEi<F
int[] temp=new int[data.length]; ti]8_vP}*
mergeSort(data,temp,0,data.length-1); teLZplC=f
} 5p-vSWr!
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private void mergeSort(int[] data, int[] temp, int l, int r) { c=a;<,Rzb
int i, j, k; : Q2=t!
int mid = (l + r) / 2; %kH,Rl\g
if (l == r) X'%BS
return; hY *^rY'
if ((mid - l) >= THRESHOLD) Nr"GxezU+A
mergeSort(data, temp, l, mid); 0C"2?etMx
else 7|[Dr@.S
insertSort(data, l, mid - l + 1); C\;%IGn
if ((r - mid) > THRESHOLD) t: ,lz8Y~
mergeSort(data, temp, mid + 1, r); C.H(aX)7
else <]#_&Na
insertSort(data, mid + 1, r - mid); W'E3_dj+
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for (i = l; i <= mid; i++) { -- IewW
temp = data; CPY|rV
} W>,D$
for (j = 1; j <= r - mid; j++) { 2$2@?]|?
temp[r - j + 1] = data[j + mid]; xa
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} x[BA <UNO
int a = temp[l]; Fa </
int b = temp[r]; \[8uE,=|
for (i = l, j = r, k = l; k <= r; k++) { &sXk!!85:
if (a < b) { D$D;'Kij
data[k] = temp[i++]; Pp4Q)2X
a = temp; 8Bxb~*
} else { 41rS0QAM
data[k] = temp[j--]; &`-e; Xt
b = temp[j]; yV6U<AP$3
} })q8{Qj!
} /nt%VLms%
} :g-vy9vb
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/**
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* @param data w2`JFxQ^x
* @param l 62[_u]<Yub
* @param i 6pZ/C<Y|W
*/ G!Y7RjWD
private void insertSort(int[] data, int start, int len) { O\@0o|NM
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); b=L|GV@$
} n^|7ycB'
} uhwCC
}
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}