归并排序: [3dGHf;miw
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package org.rut.util.algorithm.support; "8Dm7)nB
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import org.rut.util.algorithm.SortUtil; B9(w^l$kZ|
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/** $YJ 1P
* @author treeroot 5Q"yn2b4
* @since 2006-2-2 SX,$$43
* @version 1.0 @@ j\OR
*/ j32*9
public class MergeSort implements SortUtil.Sort{ c{^1`(#?
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/* (non-Javadoc) wn"\@Qv G
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )[eTZg
*/ 4{>r_^8
public void sort(int[] data) { ,RV>F_
int[] temp=new int[data.length]; !S~)U{SSK
mergeSort(data,temp,0,data.length-1); 7,)E1dx -V
} 0}GO$%l
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private void mergeSort(int[] data,int[] temp,int l,int r){ ;9~YQW@|
int mid=(l+r)/2; qFVZhBC
if(l==r) return ; 'qV lq5.
mergeSort(data,temp,l,mid); ESviWCh0Fl
mergeSort(data,temp,mid+1,r); IFW(nB(
for(int i=l;i<=r;i++){ Zl[EpXlZ
temp=data; &q&z$Gc;m
} !I|_vJ@<
int i1=l; ; &rxwL
int i2=mid+1; =pzTB-G
for(int cur=l;cur<=r;cur++){ e"1mdw"
if(i1==mid+1) wmpQF<
data[cur]=temp[i2++]; =nHkFi@D=t
else if(i2>r) xM{[~Kh_x
data[cur]=temp[i1++]; eP (*.
else if(temp[i1] data[cur]=temp[i1++]; H/t0#
else H-t$A, [
data[cur]=temp[i2++]; YdV.+v(30
} H M(X8iNt
} e O~p"d-|
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改进后的归并排序: C{U*{0}
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package org.rut.util.algorithm.support; ^G qO>1U
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import org.rut.util.algorithm.SortUtil; ,or;8aYc#
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/** Q?hf2iw
* @author treeroot #++:`Z
* @since 2006-2-2 +% <kcc3
* @version 1.0 LQqba4$
*/ 37n2 #E
public class ImprovedMergeSort implements SortUtil.Sort { 4]}d'x&
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private static final int THRESHOLD = 10; -7oIphJ=\
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/* l_((3e[)
* (non-Javadoc) uih8ZmRt
* m
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) j*?E~M.'1K
*/ TN Z-0
public void sort(int[] data) { f*V^HfiQb
int[] temp=new int[data.length]; 8/B8yY-O
mergeSort(data,temp,0,data.length-1); DZ`,QWuA
} )%9:k9
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private void mergeSort(int[] data, int[] temp, int l, int r) { /: -ig .YY
int i, j, k; s!W{ru
int mid = (l + r) / 2; >;G7ty[RX7
if (l == r) LvGo$f/9
return; +pUYFDwFx
if ((mid - l) >= THRESHOLD) od@!WjcM[8
mergeSort(data, temp, l, mid); 7h.[eMLPB
else bTx4}>=5l
insertSort(data, l, mid - l + 1); fyZtwl@6w#
if ((r - mid) > THRESHOLD) ?(khoL t
mergeSort(data, temp, mid + 1, r); H>\lE2
else 1)e[F#|
insertSort(data, mid + 1, r - mid); 'D[ *|Qcy
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for (i = l; i <= mid; i++) { ;Srzka2
temp = data; gjJ:s,Fg
} 0m4#{^Y
for (j = 1; j <= r - mid; j++) { x wfdJ(&
temp[r - j + 1] = data[j + mid]; K-(C5 "j_
} 5a5JOl$8
int a = temp[l]; q@mZ0D-
int b = temp[r]; #VZ-gy4$\B
for (i = l, j = r, k = l; k <= r; k++) { < A`srmS?
if (a < b) { (e
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data[k] = temp[i++]; aTaL|&(
a = temp; wO%617Av
} else { F(U(b_DPM
data[k] = temp[j--]; gYpFF=7j<@
b = temp[j]; 3;//o<
} us#ji i.<
} 80U(q/H%9
} Rs'mk6+
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/** >'3nsR
* @param data 47&p*=
* @param l }Zp[f6^Q
* @param i q)"yP\
*/ YRaF@?^Gn
private void insertSort(int[] data, int start, int len) { \O>;,(>i
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ?+]
} %u?A>$Jn
} uY&t9L8
} w\JTMS$
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}