归并排序: h$!qb'|
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package org.rut.util.algorithm.support; (bw;zNW
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import org.rut.util.algorithm.SortUtil; R[(,wY_1
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/** _F,OS<>
* @author treeroot qz:OnQv!
* @since 2006-2-2 <i5^izg
* @version 1.0 [qz6_WOo
*/ aj\'qRrU$
public class MergeSort implements SortUtil.Sort{ #[8gH>7
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/* (non-Javadoc) L%DL
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i0P+,U
*/ hug12Cu
public void sort(int[] data) { ,ZSuo4
int[] temp=new int[data.length]; r{btBv
mergeSort(data,temp,0,data.length-1); V6L_aee}CK
} s-*XAnot
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private void mergeSort(int[] data,int[] temp,int l,int r){ +%yh@X6
int mid=(l+r)/2; ps]6,@uyB
if(l==r) return ; 3B0%:Jj
mergeSort(data,temp,l,mid); 5IepVS(>?v
mergeSort(data,temp,mid+1,r); g^idS:GtX5
for(int i=l;i<=r;i++){ LCG<
temp=data; _YY)-H
} {*2A%}S
int i1=l; U{x'@/Ld
int i2=mid+1; 'D4NPG`z
for(int cur=l;cur<=r;cur++){ ^~0r+w61
if(i1==mid+1) .cb mCFXL
data[cur]=temp[i2++]; Zj JD@,j
else if(i2>r) %F7aFvl*
data[cur]=temp[i1++]; C"sa.#}
else if(temp[i1] data[cur]=temp[i1++]; m} V,+E
else IH0Uq_
data[cur]=temp[i2++]; 0C7"*H0R
} bhI8b/
} x\=h^r#w
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} ;#+#W+0
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改进后的归并排序: = FE,G*
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; k4@GjO1"$
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/** L]VK9qB
* @author treeroot T&c[m!}X|t
* @since 2006-2-2 7+c@pEU]
* @version 1.0 dug RO[
*/ PyoLk
public class ImprovedMergeSort implements SortUtil.Sort { 4e:hKv,+4
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private static final int THRESHOLD = 10; Wj3H
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/* 6QV/8IX
* (non-Javadoc) B<)(7GTv7"
* 8dpVB#]pp,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (T ^aZuuS
*/ vL><Y.kOEs
public void sort(int[] data) { emHi=[!i
int[] temp=new int[data.length]; \KEL.}B9E
mergeSort(data,temp,0,data.length-1); njIvVs`q
} lRrOoON
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private void mergeSort(int[] data, int[] temp, int l, int r) { FUH1Z+9
int i, j, k; ^b%AwzHH}
int mid = (l + r) / 2; @.5Ybgn
if (l == r) C/E3NL8
return; H1w;Wb1se
if ((mid - l) >= THRESHOLD) u0x\5!?2
mergeSort(data, temp, l, mid); +vQyHo
else <ZocMv9gM
insertSort(data, l, mid - l + 1); \CL`j
if ((r - mid) > THRESHOLD) r8xH A
mergeSort(data, temp, mid + 1, r); !b7H
else ]*@7o^4i
insertSort(data, mid + 1, r - mid); Kq1sGk
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for (i = l; i <= mid; i++) { rUyT5Vf
temp = data; )yK!EK\
} Wc)^@f[~<
for (j = 1; j <= r - mid; j++) { w "D"9G
temp[r - j + 1] = data[j + mid]; X:dj5v
} Ro1l:P)C`
int a = temp[l]; [)a,rrhj
int b = temp[r]; GY!&H"%
for (i = l, j = r, k = l; k <= r; k++) { _x lgsa
if (a < b) { A_g'9
data[k] = temp[i++]; -uh/W=Q1R
a = temp; bXJE 2N
} else { MF1u8Yl:0
data[k] = temp[j--]; snK/,lm.
b = temp[j]; PCES&|*rf
} H 95VU"
} hIdGQKr>V
} 9KP+
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/** >1r>cZn
* @param data 7#RW4ZM
* @param l -AbA6_j
* @param i 6q5V*sJ&
*/ AXJC&O}`
private void insertSort(int[] data, int start, int len) { \UiuJ+
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); H: U_k68
} u_uC78`p
} )I*V('R6|
} 86I".R$d
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}