归并排序: 69Y>iPRU
R~-r8dWcw
package org.rut.util.algorithm.support; \wmNeGC2
;pU#3e+P8
import org.rut.util.algorithm.SortUtil; L{>XT
X#s:C=q1
/** !}sYPz]7!
* @author treeroot OL{U^uOhY
* @since 2006-2-2 m6qmZ2<
* @version 1.0 _8Si8+j
*/ &} b'cO
public class MergeSort implements SortUtil.Sort{ dAOmqu,6
N=)
E$h
/* (non-Javadoc) TQx''$j\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {u BpM9KT
*/ 7)S;VG k
public void sort(int[] data) { U=<E,tM
int[] temp=new int[data.length]; AT^?PD_
mergeSort(data,temp,0,data.length-1); &i`\`6 q
} e+"rL]
opz.kP[e,
private void mergeSort(int[] data,int[] temp,int l,int r){ H6<\7W89y
int mid=(l+r)/2; uJ S+;H
if(l==r) return ; jW6~^>S
mergeSort(data,temp,l,mid); q#v&&]N=
mergeSort(data,temp,mid+1,r); ~o:lh],~
for(int i=l;i<=r;i++){ ojO<sT:by
temp=data; P |c6V
} A[lkGQtS4
int i1=l; .tB[8Y =J
int i2=mid+1;
D7%`hU
for(int cur=l;cur<=r;cur++){ S3-3pJ]~Zk
if(i1==mid+1) [YT"UVI
data[cur]=temp[i2++]; C7%+1w'D8
else if(i2>r) +p =n-
data[cur]=temp[i1++]; w'q}aQS
else if(temp[i1] data[cur]=temp[i1++]; @DT${,.49
else uS3s
data[cur]=temp[i2++]; .K(IRWuw
} zosJ=$L
} *Yk3y-
w{[OtGIi3
} pCSR^ua>
7Rr(YoWa
改进后的归并排序: C& 0iWY\a
R1'bB"$
package org.rut.util.algorithm.support; ]}/LNO*L"
;o;P2}zD
import org.rut.util.algorithm.SortUtil; ,HXY|fYr
TY"=8}X1
/** 6xSdA;<+]
* @author treeroot `gq@LP"o
* @since 2006-2-2 3_(fisvx
* @version 1.0 n!mtMPH$
*/ be `\ O
public class ImprovedMergeSort implements SortUtil.Sort { ,R=Mr}@u
C?Dztkz
private static final int THRESHOLD = 10; ~={8b
VsOn j~@
/* R9gK> }>Y
* (non-Javadoc) e7/ b@
* X:\ r )
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fZ6lnZ
*/ tk4~ 8
public void sort(int[] data) { yG?,8!/]
int[] temp=new int[data.length]; bit&H
mergeSort(data,temp,0,data.length-1); //VgPl
} +*[lp@zU{
;4of7d
private void mergeSort(int[] data, int[] temp, int l, int r) { kS[xwbE
int i, j, k; .63:G<
int mid = (l + r) / 2; 5haJPWG|'
if (l == r) xMDx<sk
return; 8$<jd^w
if ((mid - l) >= THRESHOLD) fU_itb(
mergeSort(data, temp, l, mid); DPn]de:e
else 2.O;
insertSort(data, l, mid - l + 1); i'|rx2]e
if ((r - mid) > THRESHOLD) xtL_,ug
mergeSort(data, temp, mid + 1, r); Z^9;sb,x
else :(,uaX>{
insertSort(data, mid + 1, r - mid); 4w0 &f
vBCQ-l<Ub
for (i = l; i <= mid; i++) { W[A;VOj0$
temp = data; fB[I1Z
} vINm2%*zJ
for (j = 1; j <= r - mid; j++) { $trvNbco
temp[r - j + 1] = data[j + mid]; ]ERPWW;^
} Ia:n<sZU
int a = temp[l]; [;II2[5 ,
int b = temp[r]; g*Nc+W](P>
for (i = l, j = r, k = l; k <= r; k++) { fkWuSGi
if (a < b) { G8OLx+!0e
data[k] = temp[i++]; $O,$KAC
a = temp; 2SEfEkk
} else { <jXXj[M2
data[k] = temp[j--]; #
)-Kf
b = temp[j]; pZz?c/h-
} "exph$
} hZ!N8nWwNR
} >5)E\4r-
A!&p,KfT5+
/** A-r-^S0\
* @param data hZ-No
* @param l UOH2I+@V
* @param i 5+dQGcE@
*/ V*SKWP
private void insertSort(int[] data, int start, int len) { +=hiLfnE
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); M >Yx_)<U
} 4AB7 uw
} )~;= 0O |X
} Ua]shSjyI
J3cbDE%^m
}