归并排序: =;xlmndT,
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package org.rut.util.algorithm.support; XC{(O:EG
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import org.rut.util.algorithm.SortUtil; HM1y$ej
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/** *)d|:q3
* @author treeroot 2jx+q
* @since 2006-2-2 I@q>ES!1H
* @version 1.0 wh:`4Yw
*/ OiY2l;68
public class MergeSort implements SortUtil.Sort{ c#;LH5KI
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/* (non-Javadoc) ig/716r|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) V2]S{!p}k
*/ 7\U1K^q
public void sort(int[] data) { @]#+`pZ4A
int[] temp=new int[data.length]; hOMFDfhU
mergeSort(data,temp,0,data.length-1); emS +%6U
} @+X}O/74
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private void mergeSort(int[] data,int[] temp,int l,int r){ |I+E`,n"b
int mid=(l+r)/2; ?3z+|;t6C
if(l==r) return ; M7Hk54U+t
mergeSort(data,temp,l,mid); $'FPst8Q<
mergeSort(data,temp,mid+1,r); X7c*T /
for(int i=l;i<=r;i++){ 16Gv?
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temp=data; pmW=l/6+V3
} )Y&De)=
int i1=l; fZ g*@RR
int i2=mid+1; Em"X5>;4
for(int cur=l;cur<=r;cur++){ kyo ,yD
if(i1==mid+1) #!D5DK@+
data[cur]=temp[i2++]; WNYLQ=;
else if(i2>r) };!c]/,
data[cur]=temp[i1++]; YKc{P"'/|
else if(temp[i1] data[cur]=temp[i1++]; z:G9Uu3H(
else (
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data[cur]=temp[i2++]; 1aT$07G0
} L2h+[f
} \4p<;$'
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} )w`Nkx
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改进后的归并排序: +{w&ksk
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package org.rut.util.algorithm.support; Cp* n2
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import org.rut.util.algorithm.SortUtil; mDmWTq\
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/** d#tUG~jc
* @author treeroot vPsX!m[#
* @since 2006-2-2 f\^QV
* @version 1.0 UiEB?X]-l'
*/ C/Z"W@7#;
public class ImprovedMergeSort implements SortUtil.Sort { }00e@a
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private static final int THRESHOLD = 10; ,{50zx2
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/* /YbL{G
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* (non-Javadoc) ZD{srEa/a
*
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >D;hT*3
*/ W<L6,
public void sort(int[] data) { /fq6-;co+
int[] temp=new int[data.length]; N
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mergeSort(data,temp,0,data.length-1); 1W
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} A!kyga6F5
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private void mergeSort(int[] data, int[] temp, int l, int r) { \d+HYLAJn
int i, j, k; ~e+w@ lK
int mid = (l + r) / 2; $(R)
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if (l == r) <.B s`P
return; b9N4Gr
if ((mid - l) >= THRESHOLD) [VW;L l
mergeSort(data, temp, l, mid); ]t3"0
else n:D*r$ C|p
insertSort(data, l, mid - l + 1); t>2^!vl
if ((r - mid) > THRESHOLD) ks;w c"k"
mergeSort(data, temp, mid + 1, r); DV\ei")
else A%1=6
insertSort(data, mid + 1, r - mid); y^\#bpq&\
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for (i = l; i <= mid; i++) { ^^SfIK?p
temp = data; u&XkbPZ%4c
} uFWgq::\
for (j = 1; j <= r - mid; j++) { ]P$DAi
temp[r - j + 1] = data[j + mid]; N08n/u&cr,
} ] <3?=$
int a = temp[l]; 1>VS/H`
int b = temp[r]; gj,J3x4TK/
for (i = l, j = r, k = l; k <= r; k++) { nln6:^w
if (a < b) { zD;]
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data[k] = temp[i++]; O + &
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a = temp; tC:,!4 P$
} else { FraW6T}_
data[k] = temp[j--]; Zw][c7%
b = temp[j]; s@LNQ|'kO
} s;7qNwYO
} KR(} A"
} MW~B[%/
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/** oz6+rM6MY
* @param data )?&kQ^@v
* @param l @1?]$?u&
* @param i mv*T=N8fC
*/ J%:/<uCmZ
private void insertSort(int[] data, int start, int len) { `uZv9I"
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); /cC6qhkp%
} Y\e]2
} nQ17E{^pR
} ioNa~F&
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}