归并排序: Ik=KEOz
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package org.rut.util.algorithm.support; Lc*i[J<s
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import org.rut.util.algorithm.SortUtil; rtf>\j+
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/** suPQlU>2sj
* @author treeroot Z\i@Qa +r
* @since 2006-2-2 *;+lF
* @version 1.0 }RG
*/ D4n~2]
public class MergeSort implements SortUtil.Sort{ ]Rnr>_>x;
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/* (non-Javadoc) :(A]Bm3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rN$_(%m_N
*/ $CHri|
public void sort(int[] data) { 1>57rx"l
int[] temp=new int[data.length]; bbiDY
mergeSort(data,temp,0,data.length-1); $}W=O:L+D
} =wU08}
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private void mergeSort(int[] data,int[] temp,int l,int r){ GRO[&;d`
int mid=(l+r)/2; OMO.-p
if(l==r) return ; u Dm=W36
mergeSort(data,temp,l,mid); SMqJMirR
mergeSort(data,temp,mid+1,r); .0.Ha}{6b
for(int i=l;i<=r;i++){ gGe `w
temp=data; |nz,srr~
} Gnj|y?'
int i1=l; D19uI&U4
int i2=mid+1; lXW.G
for(int cur=l;cur<=r;cur++){ WZ@nuK.39T
if(i1==mid+1) *"O7ml]
data[cur]=temp[i2++]; ./[%%"
else if(i2>r) O)`R)MQ)
data[cur]=temp[i1++]; 2@:Go`mg
else if(temp[i1] data[cur]=temp[i1++]; 5"^$3&)
else l5D8DvJCj
data[cur]=temp[i2++]; #Cvjv;
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} Bz9!a k~4
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改进后的归并排序: bb+-R_3Kd
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package org.rut.util.algorithm.support; yYp!s
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import org.rut.util.algorithm.SortUtil; JQi)6A?J
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/** O|?>rK
* @author treeroot ~F+{P4%`<
* @since 2006-2-2 vUvIZa
* @version 1.0 aJOhji<b#L
*/ B Lw ssr.
public class ImprovedMergeSort implements SortUtil.Sort { [[Qu|?KEa
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private static final int THRESHOLD = 10; F^3Q0KsT
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/* >q[ (UV
* (non-Javadoc) dilRL,
* qx5.LiF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rrwBsa3
*/
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public void sort(int[] data) { ;
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int[] temp=new int[data.length]; ;6U=fBp7<
mergeSort(data,temp,0,data.length-1); K82pWpR
} )(_}60
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private void mergeSort(int[] data, int[] temp, int l, int r) { M@E*_U!U
int i, j, k; %m t|Dl
int mid = (l + r) / 2; |94"bDL3~
if (l == r) $cSrT)u:
return; 3/@7$nV
if ((mid - l) >= THRESHOLD) bQrH8)
mergeSort(data, temp, l, mid); ]j~V01p/e
else SwV0q
insertSort(data, l, mid - l + 1); *y='0)[BD
if ((r - mid) > THRESHOLD) 4!XB?-.
mergeSort(data, temp, mid + 1, r); ow>^(>^~
else Ym8G=KA
insertSort(data, mid + 1, r - mid); ZXFM_>y5
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for (i = l; i <= mid; i++) { zVd2kuI&?
temp = data; U_wn/wcLS
} [C,<Q
for (j = 1; j <= r - mid; j++) { K;sH0*
temp[r - j + 1] = data[j + mid]; cuB~A8H#}
} fOdkzD,
int a = temp[l]; $[by)
int b = temp[r]; B=jJ+R
for (i = l, j = r, k = l; k <= r; k++) { O1ofN#u
if (a < b) { %kxq" =3
data[k] = temp[i++]; Wr a W
a = temp; nws '%MK)
} else { =%%\b_\L
data[k] = temp[j--]; w9SPkPkYE
b = temp[j]; VL?ubt<
} F@& R"-
} (/a2#iW
} q?nXhUD
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/** 1y2D]h /'
* @param data {Uz@`QO3
* @param l 9gZMfP
* @param i C},;M@xV
*/ w-C~
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private void insertSort(int[] data, int start, int len) { Vl%AN;o
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 1`^l8V(
} aEo!yea
} o8-BTq8
} ] QGYEjW
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}