归并排序: G'wyH[ d/
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package org.rut.util.algorithm.support; Pjq()\/[Z
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import org.rut.util.algorithm.SortUtil; b=SCyGxlZ5
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/** `trcYmR=k
* @author treeroot 6LqF*$+$`
* @since 2006-2-2 ']Z%6_WF
* @version 1.0 kPO+M~+n
*/ BHU=TK@GR
public class MergeSort implements SortUtil.Sort{ '<O.J(N~4!
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/* (non-Javadoc) &G?w*w_n
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3PkU>+.6
*/ 08g2? 5w"
public void sort(int[] data) { 6w_TL<S
int[] temp=new int[data.length]; =%B}8$.|
mergeSort(data,temp,0,data.length-1); *o<|^,R
} Cn_r?1{W
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private void mergeSort(int[] data,int[] temp,int l,int r){ 2;w> w#}>
int mid=(l+r)/2; Ci2*5n<
if(l==r) return ; lbh7`xCR
mergeSort(data,temp,l,mid); /XdLdA!v
mergeSort(data,temp,mid+1,r); (%9J(4
for(int i=l;i<=r;i++){ zKh <zj
temp=data; ViUx^e\
} L^2wEF
int i1=l;
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int i2=mid+1; b27t-p8
for(int cur=l;cur<=r;cur++){ Rhw+~gd*F
if(i1==mid+1) %UG|R:
data[cur]=temp[i2++]; 8k_hX^
else if(i2>r) Un&rP70
data[cur]=temp[i1++]; G)gb5VW k
else if(temp[i1] data[cur]=temp[i1++]; -oY8]HrXfK
else cmY `$=
data[cur]=temp[i2++]; )"63g
} &M=15 uCK
} IiY%y:!g
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} w,X J8+B
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改进后的归并排序: 2<d'!cm
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package org.rut.util.algorithm.support; f*^bV_
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import org.rut.util.algorithm.SortUtil; Ix0#eoj
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/** `6PBV+]Vm3
* @author treeroot 4I.)>+8V
* @since 2006-2-2 2/x~w~3U
* @version 1.0 Z`n "}{
*/ %~0]o@LW7
public class ImprovedMergeSort implements SortUtil.Sort { 51ILR9 Bc_
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private static final int THRESHOLD = 10; iL~(BnsF
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/* !|cM<}TF,
* (non-Javadoc) :\%hv>}|
* rY$wC%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ppeF,Q
*/ V2g"5nYT
public void sort(int[] data) { WY26Iq@C
int[] temp=new int[data.length]; SzG?m]
mergeSort(data,temp,0,data.length-1); 46H@z=5
} sBNqg~HwB?
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private void mergeSort(int[] data, int[] temp, int l, int r) { 8A'SMJi
int i, j, k; 8sq0 BH
int mid = (l + r) / 2; 8SCXA9}
if (l == r) T`c:16I
return; 8 v da"
if ((mid - l) >= THRESHOLD) aLwEz}-
mergeSort(data, temp, l, mid); J?jxD/9Yb
else Iomx"y]9
insertSort(data, l, mid - l + 1); Jt)J1CAYo
if ((r - mid) > THRESHOLD) F'ez{B\AX
mergeSort(data, temp, mid + 1, r); gUiZv8C
else VuH}@
insertSort(data, mid + 1, r - mid); tn |H~iF{
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for (i = l; i <= mid; i++) { `'pfBVBz
temp = data; eGWwPSIp
} 'a~F'FN$
for (j = 1; j <= r - mid; j++) { =~q$k
temp[r - j + 1] = data[j + mid]; vpdT2/F
} I~-sBMm(w
int a = temp[l]; p.,`3"C1
int b = temp[r]; .{(gku>g(
for (i = l, j = r, k = l; k <= r; k++) {
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if (a < b) { D8b9T.[(
data[k] = temp[i++]; -)DxF<8B
a = temp; 4OG1_6K
} else { _OK!/T*FBt
data[k] = temp[j--]; m5W':vM
b = temp[j]; K'[kl'
} Z,>owoP4
} wid
} eXkpU7w;
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/** ]@l;;Sp
* @param data
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* @param l =$_kkVQ$
* @param i p;mV?B?oAQ
*/ BNixp[Hc
private void insertSort(int[] data, int start, int len) { ^Jc|d,u;s
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); OSwum!hzN
} M0]J`fL@
} XFi9qL^
} 6g)CpZU
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}