归并排序: [ U wi
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package org.rut.util.algorithm.support; #Z<a
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import org.rut.util.algorithm.SortUtil; PK4iuU`vh
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/** 2[r^M'J
* @author treeroot [Ts"OPb%~
* @since 2006-2-2 *>+,(1Fz
* @version 1.0 E_bO9nRHV
*/ C|?o*fQ
public class MergeSort implements SortUtil.Sort{ {U_$&f9s
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/* (non-Javadoc) m]cHF.:5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @, W vvh
*/ HuVJ\%.
public void sort(int[] data) { R%c SJ8O#
int[] temp=new int[data.length]; X B_B4X1R
mergeSort(data,temp,0,data.length-1); Jzp#bgq}|
} MG{YrX) oi
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private void mergeSort(int[] data,int[] temp,int l,int r){ &|`C)6[C
int mid=(l+r)/2; KR%{a(V;7
if(l==r) return ; '_$uW&{NI
mergeSort(data,temp,l,mid); h)Ff2tX
mergeSort(data,temp,mid+1,r); !0dNQ[$82
for(int i=l;i<=r;i++){ w/IZDMBf|
temp=data; Vo"RO$%ow*
} P(K>=O
int i1=l; MXyaE~LK
int i2=mid+1; hsw9(D>jp
for(int cur=l;cur<=r;cur++){ ?Oc{bF7
if(i1==mid+1) Ck /F9(
data[cur]=temp[i2++]; 2~t[RY
else if(i2>r) ]$,UPR/3
data[cur]=temp[i1++]; >N.]|\V
else if(temp[i1] data[cur]=temp[i1++]; -@Uqz781
else q/4 [3h
data[cur]=temp[i2++]; nO)X!dp}J
} =k oSUVO0
} 51QRM32Y
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} t&(PN%icD
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改进后的归并排序: A.5i"Ci[ie
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package org.rut.util.algorithm.support; ScSZGs 5&
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import org.rut.util.algorithm.SortUtil; %.z,+Zz?
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/** 1NcCy!+
* @author treeroot xrN
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* @since 2006-2-2 # (- Qx
* @version 1.0 U5r7j
*/ Wy%s1iu
public class ImprovedMergeSort implements SortUtil.Sort { |qoKO:B4-[
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private static final int THRESHOLD = 10; )<xypDQ
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/* ":nQgV\9
* (non-Javadoc) $*W6A/%O
* ~M(5Ho
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1=]kWp`i
*/ 0Ld@H)
public void sort(int[] data) { Kn?lHH*w7
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); )nd\7|5#
} SnYLdwgl
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private void mergeSort(int[] data, int[] temp, int l, int r) { G5FaYL.7
int i, j, k; ZKdeB3D
int mid = (l + r) / 2; gp-T"l
if (l == r) ?}B:
return; 8L1oh j
if ((mid - l) >= THRESHOLD) %xQ.7~
mergeSort(data, temp, l, mid); .WQ+AE8Q
else oQL59XOT4
insertSort(data, l, mid - l + 1);
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if ((r - mid) > THRESHOLD) 2z@\R@F
mergeSort(data, temp, mid + 1, r); 1c@}C+F+
else >g;kJe
insertSort(data, mid + 1, r - mid); aIXdV2QS
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for (i = l; i <= mid; i++) { $:of=WTY(
temp = data; 8#D:H/`'
} `4 y]Z)
for (j = 1; j <= r - mid; j++) { ^xZ
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temp[r - j + 1] = data[j + mid]; $v b,P(
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int a = temp[l]; =-o'gL
int b = temp[r]; W<<9y
for (i = l, j = r, k = l; k <= r; k++) { ~RD+.A
if (a < b) { aSP4a+\*
data[k] = temp[i++]; uZi.HG{<)
a = temp; &,.Y9;
b
} else { <s@-:;9~
data[k] = temp[j--]; O,.!2wVrN
b = temp[j]; I_q~*/<h
} ')N{wSM9Ft
} A$WZF/x
} Bu]t*$
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/** jp+_@S>
* @param data d
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* @param l 9*:gr#(5
* @param i wIf
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*/ ,]5Ic.};p
private void insertSort(int[] data, int start, int len) { _xLHrT!y
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); X1vNF|o~
} nPUqMn'
} k'X;ruQ:tF
} >Ng)k]G
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}