归并排序: 9IXy96]]6
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package org.rut.util.algorithm.support; %J-:%i
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import org.rut.util.algorithm.SortUtil; 64mh.j
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/** R"XycXn_$
* @author treeroot [*O>Lk
* @since 2006-2-2 muXP5MO
* @version 1.0 6p
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*/ +x{o
public class MergeSort implements SortUtil.Sort{ nGWy4rY2S
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/* (non-Javadoc) W8QP6^lY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7:F0?l*
*/ EGI$=Y
public void sort(int[] data) { HqsqUS3[
int[] temp=new int[data.length]; [2xu`HT02
mergeSort(data,temp,0,data.length-1); !X: TieyVu
} .n+
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private void mergeSort(int[] data,int[] temp,int l,int r){ tvf.K+
int mid=(l+r)/2; 0xDn!
if(l==r) return ; OcMB)1uh\
mergeSort(data,temp,l,mid); >"1EN5W
mergeSort(data,temp,mid+1,r); T^]]z}k
for(int i=l;i<=r;i++){ Q?T+^J
temp=data; (KN",u6F
} jNx{*2._r
int i1=l; c;/vzIJj
int i2=mid+1; VF11eZ"
for(int cur=l;cur<=r;cur++){ :0(^^6Q\
if(i1==mid+1) ,<+:xl
data[cur]=temp[i2++]; }l+_KA
else if(i2>r) |LJv*
data[cur]=temp[i1++]; @TW:6v`
else if(temp[i1] data[cur]=temp[i1++]; uSYI
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data[cur]=temp[i2++]; Ga9iPv
} vh&~Y].W Y
} [4C_iaE
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改进后的归并排序: `+(n+QS _
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package org.rut.util.algorithm.support; kD+#|f
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import org.rut.util.algorithm.SortUtil; 2{WZ?H93a
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/** &k|EG![
* @author treeroot m4W(h6
* @since 2006-2-2 q]f7D\ M
* @version 1.0 yqK_|7I+
*/ F$4=7Njv
public class ImprovedMergeSort implements SortUtil.Sort { B>'J5bZsw
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private static final int THRESHOLD = 10; gktlwiCZ
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/* q("l?'
* (non-Javadoc) ueU"v'h\
* f%_$RdU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Z%ZOAu&p
*/ )CoFRqz<h
public void sort(int[] data) { um]N]cCD`
int[] temp=new int[data.length]; ! 1?u0
mergeSort(data,temp,0,data.length-1); Y
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} D`Vb3aNB=L
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private void mergeSort(int[] data, int[] temp, int l, int r) { 2=fLb7
int i, j, k; =;n>#<
int mid = (l + r) / 2; ,0HID:&
if (l == r) OAo03KW
return; NE`;=26c
if ((mid - l) >= THRESHOLD) WSeiW
mergeSort(data, temp, l, mid); (/&ht-~EL
else .
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insertSort(data, l, mid - l + 1); NI:OL
if ((r - mid) > THRESHOLD) sX>|Y3S\U
mergeSort(data, temp, mid + 1, r); yTbtS-
else K; hP0J
insertSort(data, mid + 1, r - mid); c
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for (i = l; i <= mid; i++) { j&.JAQ*2;
temp = data; 4
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} u-n$%yDS
for (j = 1; j <= r - mid; j++) { Z$Ps_Ik
temp[r - j + 1] = data[j + mid]; $hk_v~zM
} >>R)?24,<
int a = temp[l]; ;1,#rTs
int b = temp[r]; h\)ual_r[j
for (i = l, j = r, k = l; k <= r; k++) { WH $*\IGJL
if (a < b) { -"^"& )
data[k] = temp[i++]; ]Zay9jD}c-
a = temp; 1Ogtzf
} else { |`wJ
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data[k] = temp[j--]; yYk?K<ou
b = temp[j]; A1zV5-E/
} \n#l+R23
} RC"xnnIJv
} S=w~bz,/
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/** S +73 /Vs
* @param data bw#\"uJ
* @param l }LIf]YK
* @param i ONcS,oHW
*/ .b*-GWx
private void insertSort(int[] data, int start, int len) { xr)m8H
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 8p~[8}
} b;mpZ|T.
} r_a1oO:
} qP%[nY
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}