归并排序: V_)465g
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; yLt>OA<X
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/** b28C(
* @author treeroot SLud}|f;o
* @since 2006-2-2 9cMMkOM J
* @version 1.0 (HeIO
*/ :NWrbfz
public class MergeSort implements SortUtil.Sort{ 83{v_M
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/* (non-Javadoc) /?6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;7!u(XzN
*/ T{ /\q 5
public void sort(int[] data) { zc>LwX}<
int[] temp=new int[data.length]; m] @o1J
mergeSort(data,temp,0,data.length-1); TI3@/SB>
} FsfP^a
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private void mergeSort(int[] data,int[] temp,int l,int r){ N3Z6o.k
int mid=(l+r)/2; (m=F
if(l==r) return ; w{Y:p[}
mergeSort(data,temp,l,mid); rVnolA*%
mergeSort(data,temp,mid+1,r); <P
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for(int i=l;i<=r;i++){ mmEe@-lE
temp=data; ~G~:R
} X!]p8Q y
int i1=l; pKk{Q0Rt
int i2=mid+1; iIg99c7/&9
for(int cur=l;cur<=r;cur++){ ?yvjX90
if(i1==mid+1) cX48?srG
data[cur]=temp[i2++]; Z`@< O%
else if(i2>r) Pv3 e*I((
data[cur]=temp[i1++]; [2zS@p
else if(temp[i1] data[cur]=temp[i1++]; yrR,7vJ
else +RD{<~i
data[cur]=temp[i2++]; /909ED+)>9
} 74%Uojl"
} 0 oHnam
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} m?<5-"hz
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改进后的归并排序: P.]O8r
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package org.rut.util.algorithm.support; ,SoqVboRl
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import org.rut.util.algorithm.SortUtil; p87VJ}
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/** 'FGf#l<
* @author treeroot 8x<; AL|`
* @since 2006-2-2 |'12Kv]#Xa
* @version 1.0 </7?puVR
*/ 0'^zIL#.
public class ImprovedMergeSort implements SortUtil.Sort { V?Ye^-29
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private static final int THRESHOLD = 10; 8'Bik
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/* tje
* (non-Javadoc) Pb@9<N Xm'
* KEvT."t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \g\,
*/ 8@4)p.{5I
public void sort(int[] data) { *'ex>4^
int[] temp=new int[data.length]; 5TcirVO82
mergeSort(data,temp,0,data.length-1); +J%9%DqF
} Klk[h
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private void mergeSort(int[] data, int[] temp, int l, int r) { n/-d56
int i, j, k; KdkZ-.
int mid = (l + r) / 2; )I9W a*I
if (l == r) x-ShY&k
return; s4Z5t$0|
if ((mid - l) >= THRESHOLD) -<WQ>mrB&
mergeSort(data, temp, l, mid); % wS5m#n
else EX^j^#N
insertSort(data, l, mid - l + 1); @K.[;-;g
if ((r - mid) > THRESHOLD) 0p'=Vel{}
mergeSort(data, temp, mid + 1, r); lzStJ,NPqn
else rz3!0P!"K
insertSort(data, mid + 1, r - mid); )]C7+{ImC
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for (i = l; i <= mid; i++) { Z,m;eCLG]
temp = data; M `bEnu
} l*C(FPw4
for (j = 1; j <= r - mid; j++) { uWKc
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temp[r - j + 1] = data[j + mid]; O U3KB
} m\xE8D(,
int a = temp[l]; <xQHb^:
int b = temp[r]; fo30f=^Gi
for (i = l, j = r, k = l; k <= r; k++) { `l8^n0-
if (a < b) { Up kw.`D`
data[k] = temp[i++]; 6@@J>S>
a = temp; H{3A6fb<
} else { :If1zB)
data[k] = temp[j--]; 7ehs+GI
b = temp[j]; F82_#|kpS
} Jd>"g9
} /`V:;
} 6Q.6
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/** @SV.F
* @param data i0-zGEMB.
* @param l X}$uvB}+>
* @param i [#emm1k
*/ 3<nd;@:-
private void insertSort(int[] data, int start, int len) { %}asw/WiUa
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); {qHf%y&[
} &jHnM^nQ
} F&om^G'U
} Jr4^@]78o<
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}