归并排序: U\b,W&%P
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package org.rut.util.algorithm.support; myJsRb5
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import org.rut.util.algorithm.SortUtil; HWs?,AJNxB
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/** )T2Sw z/
* @author treeroot h<uRlTk
* @since 2006-2-2 *np%67=jO
* @version 1.0 lFRgyEPH
*/ L:%h]-
public class MergeSort implements SortUtil.Sort{ fd)}I23Q'
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/* (non-Javadoc) _e?(Gs0BM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n7Re@'N<
*/ 4ci
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public void sort(int[] data) { >+G=|2
int[] temp=new int[data.length]; `|]juc
mergeSort(data,temp,0,data.length-1); 2p'qp/
} EnfSVG8kB8
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private void mergeSort(int[] data,int[] temp,int l,int r){ Y%Saz+
int mid=(l+r)/2; 3:76x
if(l==r) return ; OvQG%D}P=
mergeSort(data,temp,l,mid); O*c+TiTb
mergeSort(data,temp,mid+1,r); 3lLO.
for(int i=l;i<=r;i++){ B?Pu0
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temp=data; ^#_@Kq%th
} 1tfm\/V}ho
int i1=l; .PF~8@1ju
int i2=mid+1; SVeL c
for(int cur=l;cur<=r;cur++){ ,.DU)Wi?}
if(i1==mid+1) `@eQL[Z9x
data[cur]=temp[i2++]; V<(cW'zA/
else if(i2>r) NO;+:0n
data[cur]=temp[i1++]; Vbz$dpT
else if(temp[i1] data[cur]=temp[i1++]; z+Y0Zh";/#
else (?oK+,v?L
data[cur]=temp[i2++]; .p <!2
} w 8T#~Dc
} [9*+s
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改进后的归并排序: W!htCwnkF
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package org.rut.util.algorithm.support; UG 9uNgzQ/
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import org.rut.util.algorithm.SortUtil; ,D;d#fJ
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/** {0QNqjue
* @author treeroot 4Bs '5@
* @since 2006-2-2 =`99ez+y
* @version 1.0 `Z0FQ( r_
*/ z'j4^Xz?%$
public class ImprovedMergeSort implements SortUtil.Sort {
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private static final int THRESHOLD = 10; Qw}uB$S>
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/* 4*P#3 B'@V
* (non-Javadoc) )pbsvR_
* jH({Qc,97
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yX0nyhq
*/ 4hz T4!15
public void sort(int[] data) { gE\&[;)DB
int[] temp=new int[data.length]; #p*D.We
mergeSort(data,temp,0,data.length-1); [0qe ?aI
} j4k\5~yzS
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private void mergeSort(int[] data, int[] temp, int l, int r) { m}hEi
int i, j, k; xhK8Q
int mid = (l + r) / 2; <hvs{}TS
if (l == r) %<8`(Uu5
return; rP|~d}+I
if ((mid - l) >= THRESHOLD) >~:Md
mergeSort(data, temp, l, mid); G!dx)v
else 2*Zk^h=
insertSort(data, l, mid - l + 1); %e^GfZ
if ((r - mid) > THRESHOLD) 2,aH1Xbex
mergeSort(data, temp, mid + 1, r); J/LsL
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else lg"aB
insertSort(data, mid + 1, r - mid); `>)[UG!:|
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for (i = l; i <= mid; i++) { VKV
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temp = data; h4Wt
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} B6=?Qp/f
for (j = 1; j <= r - mid; j++) { V6Mt;e)C
temp[r - j + 1] = data[j + mid]; 6_,JW{#"
} 0vETg'r
int a = temp[l]; Lq|>n[KY
int b = temp[r]; ijsoY\V50
for (i = l, j = r, k = l; k <= r; k++) { ?4A/?Z]ub
if (a < b) { e:%|.$4OG
data[k] = temp[i++]; ~8s2p%~
a = temp; CP~mKmMV
} else { 4
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data[k] = temp[j--]; ^M{,{bG
b = temp[j]; wA\5-C7j
} {`QA.he.
} fuzB;Ea
} N_IKH)
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/** w
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* @param data ak7kb7 5o
* @param l J$Z=`=]t+
* @param i U.KQjBi
*/ 4vEP\E3u<j
private void insertSort(int[] data, int start, int len) { W%4=x>J-
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); #~!"`B?#*
} TP"cEfs x
} ?u|@,tQ[
} _Z23lF9
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}