归并排序: QoTjKck.
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package org.rut.util.algorithm.support; C$#X6Q!,
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import org.rut.util.algorithm.SortUtil; 8^)K|+_'m
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/** * u{CnH
* @author treeroot RQt\_x7P
* @since 2006-2-2 &.`/ln
* @version 1.0 n=tg{_9f%
*/ EWn\]f|
public class MergeSort implements SortUtil.Sort{ <h<4R Rj
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/* (non-Javadoc) N%" /mcO
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,.PW
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*/ zm`^=cV
public void sort(int[] data) { {xS\CC(g
int[] temp=new int[data.length]; ~ @Au <
mergeSort(data,temp,0,data.length-1); n3LCQ:]Tf
} J2P5<
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private void mergeSort(int[] data,int[] temp,int l,int r){ =sa bJsgL
int mid=(l+r)/2; dt=5 Pnf[y
if(l==r) return ; mbCY\vEl
mergeSort(data,temp,l,mid); 2%oo.?!R
mergeSort(data,temp,mid+1,r); m(c5g[6nO
for(int i=l;i<=r;i++){ e Zb8x
temp=data; 3t^r;b
} L?~-<k
int i1=l; ^"hsbk&Yu
int i2=mid+1; ^d[s*,i?
for(int cur=l;cur<=r;cur++){ p@x1B
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if(i1==mid+1) hp6%zUR
data[cur]=temp[i2++]; +(9qAB7
else if(i2>r) 2 bQC2
data[cur]=temp[i1++]; {S;/+X,
else if(temp[i1] data[cur]=temp[i1++]; }iF"&b0n"
else \/
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data[cur]=temp[i2++]; Gkq<?q({t
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} J;S@Q/s
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} $YCy,Ew
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改进后的归并排序: 3[E)/~-
// \UthOT
package org.rut.util.algorithm.support; &:ib>EB03=
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import org.rut.util.algorithm.SortUtil; \hcb~>=C
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/** (HZzA7eph
* @author treeroot V3]"ROH
* @since 2006-2-2 F6xQ`T|
* @version 1.0 hc4W|Ofj
*/ ND|!U#wMNV
public class ImprovedMergeSort implements SortUtil.Sort { ZZXQCP6]
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private static final int THRESHOLD = 10; 1]lm0bfs
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/* ]/y&5X
* (non-Javadoc) 3#@ETt0X(
* DMY?'Nts!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "jyh.@<
*/ 38hA guZX
public void sort(int[] data) { P{!r<N
int[] temp=new int[data.length]; c>*RQ4vE
mergeSort(data,temp,0,data.length-1); <r%QaQRbm
} 2Hp#~cE+.
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private void mergeSort(int[] data, int[] temp, int l, int r) { YLfZ;W|6u
int i, j, k; f9Hm2wV
int mid = (l + r) / 2; @pKQ}?
if (l == r) 5$|wW}SA
return; O)tZ`X;
if ((mid - l) >= THRESHOLD) >/DyR+?>4
mergeSort(data, temp, l, mid); nD$CY K
else ?`oCc[hY
insertSort(data, l, mid - l + 1); JRC+>'}Xj
if ((r - mid) > THRESHOLD) }"'^.FG^_
mergeSort(data, temp, mid + 1, r); uK`T1*_
else p6yC1\U!o
insertSort(data, mid + 1, r - mid); hl[!4#b]K
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for (i = l; i <= mid; i++) { ;J[1S
temp = data; wM;9plYlw0
} ,ij"&XA
for (j = 1; j <= r - mid; j++) { 45hjN6
temp[r - j + 1] = data[j + mid]; poqx
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} Jz!8Xg%a
int a = temp[l]; n~#%>C7
int b = temp[r]; 9W{=6D86e
for (i = l, j = r, k = l; k <= r; k++) { }lk_Oe1
if (a < b) { 8W]6/st?]
data[k] = temp[i++]; pOCLyM9c
a = temp; ueiXY|
} else { Q`Q%;%t
data[k] = temp[j--]; 'wd-!aZAd
b = temp[j]; }wh)I]]U
} 62&(+'$n
} Ew=8"V`C
} 8/;q~:v
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/** \S)\~>.`y!
* @param data u(7PtmV[!
* @param l 5_@8g+~
* @param i McgTTM;E
*/ t&SC>8M<
private void insertSort(int[] data, int start, int len) { X;7gh>Q'4
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); &cSTem
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} 9ZL3p!
} @LS*WJ< w-
} Wb] ha1$
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}