归并排序: >kYyR.p.b
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; 6EY4@0%A
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/** #Gx@\BE{
* @author treeroot &&O=v]6,V
* @since 2006-2-2 2uVm?nm
* @version 1.0 4a-wGx#h
*/ hM}2++V
public class MergeSort implements SortUtil.Sort{ m='OnTeOE
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/* (non-Javadoc) G<'S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -eTGRr
*/ JK4 @
public void sort(int[] data) { CR<l"~X
int[] temp=new int[data.length]; 2dfA}i>k
mergeSort(data,temp,0,data.length-1); GcuZPIN%D
} >nX'RE|F
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private void mergeSort(int[] data,int[] temp,int l,int r){ <FEO6YP
int mid=(l+r)/2; 71_N9ub@z
if(l==r) return ; q9Q4F
mergeSort(data,temp,l,mid); Q"O _h
mergeSort(data,temp,mid+1,r); <vs.Ucxx
for(int i=l;i<=r;i++){ F <(Y
temp=data; y+a&swd2(U
} B_>
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int i1=l; _wBPn6gg`
int i2=mid+1; ,P^"X5$
for(int cur=l;cur<=r;cur++){ &D:88
if(i1==mid+1) Y2Bu,/9^
data[cur]=temp[i2++]; A@UnrbX:
else if(i2>r) JS9q'd
data[cur]=temp[i1++]; 8CCA/6
else if(temp[i1] data[cur]=temp[i1++]; O);V{1P
else e
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data[cur]=temp[i2++]; *3|KbCX
} NQmDm!-4
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改进后的归并排序: vJ!t.Vou
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package org.rut.util.algorithm.support; /-T%yuU
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import org.rut.util.algorithm.SortUtil; y03l_E,
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/** Jy9&=Qh
* @author treeroot 3I]5DW %-
* @since 2006-2-2 vsK>?5{C-
* @version 1.0 -Db(
*/ @ o]F~x
public class ImprovedMergeSort implements SortUtil.Sort { c c:xT0Y
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private static final int THRESHOLD = 10; Z,*VRuA
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/* lG2){){j
* (non-Javadoc) &A~ 1Q#4
* n}2}4^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Rzp-Q5@MY
*/ p~t$ll0s
public void sort(int[] data) { rie1F,
int[] temp=new int[data.length]; k:fRk<C
mergeSort(data,temp,0,data.length-1); ]BA8[2=m
} '2NeuK -KD
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private void mergeSort(int[] data, int[] temp, int l, int r) { T"O!
int i, j, k; *N7\d9y
int mid = (l + r) / 2; "xWC49
if (l == r) 61wiXX"N
return; [X|P(&\hQd
if ((mid - l) >= THRESHOLD) @uc%]V<:k
mergeSort(data, temp, l, mid); m|!sY[!
else d/e9LK
insertSort(data, l, mid - l + 1); 7{6wNc
if ((r - mid) > THRESHOLD) *{uu_O
mergeSort(data, temp, mid + 1, r); )[A}h'J)
else &kP>qTI^p~
insertSort(data, mid + 1, r - mid);
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for (i = l; i <= mid; i++) { #p^D([k
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temp = data; uy$o%NL-7
} PWTAy\
for (j = 1; j <= r - mid; j++) { #N*~Q
temp[r - j + 1] = data[j + mid]; p0Vw@R=
} mV-MJ$3r
int a = temp[l]; Ba"Z^(:
int b = temp[r]; &4DWLI
for (i = l, j = r, k = l; k <= r; k++) { <3i!{"}
if (a < b) { JWLQ9UX
data[k] = temp[i++]; ;(z0r_p<q
a = temp; c Mq|`CM
} else { iKu5K0x{>I
data[k] = temp[j--]; |KuH2,n0
b = temp[j]; ur;8uv2o
} 1&U U6| X
} AtSEKpKc
} ^s^X n QhE
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/** ;#AV~Y-
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* @param data j &~OR6
* @param l (i {
* @param i S^ 3I" B
*/ zH.7!jeE
private void insertSort(int[] data, int start, int len) { O `*}N1No[
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); *edB3!!
} ondF
} m/<7FU8
} Uc.K6%iI
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}