归并排序: (x1"uy7_
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package org.rut.util.algorithm.support; . T6_N
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import org.rut.util.algorithm.SortUtil; =\Tud-1Z
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/** YWcui+4p}
* @author treeroot &P,4EaC9;
* @since 2006-2-2 =B/s HN
* @version 1.0 2#$}yP~
*/ QN2*]+/h
public class MergeSort implements SortUtil.Sort{ LhVLsa(-%
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/* (non-Javadoc) uusY,Dt/9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -tK;RQYax
*/ $ sA~p_]
public void sort(int[] data) { Kd`l[56#
int[] temp=new int[data.length]; a!^-~pH:
mergeSort(data,temp,0,data.length-1); <M=W)2D7
} zal3j^
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private void mergeSort(int[] data,int[] temp,int l,int r){ '$kS]U
int mid=(l+r)/2; 0f=N3)
if(l==r) return ; j-I6QUd
mergeSort(data,temp,l,mid); 4Rrw8Bw
mergeSort(data,temp,mid+1,r); 6,g5To#vw
for(int i=l;i<=r;i++){ r$3~bS$]
temp=data; N)
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} 1v[#::Bs
int i1=l; _Sk<S
int i2=mid+1; \J3v>&m<7
for(int cur=l;cur<=r;cur++){ 8,H#t@+MT
if(i1==mid+1) ?4wehcZz
data[cur]=temp[i2++]; X."h Tha5
else if(i2>r) dp// p)B>
data[cur]=temp[i1++]; 0-t4+T
else if(temp[i1] data[cur]=temp[i1++]; GH; F3s
else P5
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data[cur]=temp[i2++]; wNf*/?N
} g`~lIt[=
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改进后的归并排序: x
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package org.rut.util.algorithm.support; *]>OCGsr
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import org.rut.util.algorithm.SortUtil; h>L6{d1
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/** MeK\eZ\
* @author treeroot y?R <g^A
* @since 2006-2-2 .U(SkZ`6
* @version 1.0 -fSKJo#}|
*/ M*T# 5
public class ImprovedMergeSort implements SortUtil.Sort { P`IMvOs&
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private static final int THRESHOLD = 10; G.q^Zd#.T
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/* p-(ADQS
* (non-Javadoc) 9^Vx*KVrU
* w_z^5\u0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a,0o{*(u$
*/ ?w5nKpG#RI
public void sort(int[] data) { @R-~zOv
int[] temp=new int[data.length]; )H37a
mergeSort(data,temp,0,data.length-1); nE"b`
} .}hZ7>4-
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private void mergeSort(int[] data, int[] temp, int l, int r) { B,VSFpPx
int i, j, k; .+JPtL
int mid = (l + r) / 2; kmwrv -W
if (l == r) K7&8;So
return; k~9Ywf
if ((mid - l) >= THRESHOLD) $qyM
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mergeSort(data, temp, l, mid); >G3J3P(
else 7i|hlk;
insertSort(data, l, mid - l + 1); o}^vREO
if ((r - mid) > THRESHOLD) _6ax{:/Q
mergeSort(data, temp, mid + 1, r); C5lD
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else ^J5V!i$
insertSort(data, mid + 1, r - mid); S,<.!v 57
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for (i = l; i <= mid; i++) { EV7+u0uN&Q
temp = data; ,IVr4#w0=
} kV(DnZ#jq
for (j = 1; j <= r - mid; j++) { I#6'
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temp[r - j + 1] = data[j + mid]; d[Fr
} 5_tK3Q8?
int a = temp[l]; 9q,JqB
int b = temp[r]; |Nd.'|g,
for (i = l, j = r, k = l; k <= r; k++) { MIyLQ
if (a < b) { PS<tS_.
data[k] = temp[i++]; W-ND<=:Up
a = temp; ,"MUfZ
} else { W 9:{pQG
data[k] = temp[j--]; vM3|Ti>a'
b = temp[j]; eS# 0-
} 6~Oje>w;
} Vqp.jF1|
} Sdu@!<?B
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/** [\M?8R$)
* @param data [Oy2&C
* @param l AFhG{G'W
* @param i ^5@"|m1
*/ 8/kO9'.P
private void insertSort(int[] data, int start, int len) { b
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); o >4>7
} U+A(.+d.
} Ky~~Cd$
} eEZlVHM;O
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}