归并排序: #o RUH8
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package org.rut.util.algorithm.support; 8{YxUD
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import org.rut.util.algorithm.SortUtil; {V8Pn2mlo
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/** LcXMOT)s
* @author treeroot hA8 zXk/'8
* @since 2006-2-2 Z:_y,( 1Q
* @version 1.0 ?zEF?LJoK
*/ UU;:x"4
public class MergeSort implements SortUtil.Sort{ z#4g,)ZX
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/* (non-Javadoc) =-qsz^^a-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) v`&Z.9!Tz^
*/ x_K%
public void sort(int[] data) { ~ #CCRUhM
int[] temp=new int[data.length]; J (h>
mergeSort(data,temp,0,data.length-1); 1%,Z&@^j
} l_c?q"X
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private void mergeSort(int[] data,int[] temp,int l,int r){ CkU=0mcY
int mid=(l+r)/2; : [y(<TLw
if(l==r) return ; m"R(_E5
mergeSort(data,temp,l,mid); g8Z14'Ke
mergeSort(data,temp,mid+1,r); 8##jd[o&p~
for(int i=l;i<=r;i++){ ^U}0D^jDeE
temp=data; o[#a}5Y
} z"3c+?2
int i1=l; (zBQ^97]
int i2=mid+1; Z3dd9m#.]
for(int cur=l;cur<=r;cur++){ oK6lCGM5
if(i1==mid+1) tOw
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data[cur]=temp[i2++]; x8Sq+BY
else if(i2>r) _ LNPB$P
data[cur]=temp[i1++]; 7;NV
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else if(temp[i1] data[cur]=temp[i1++]; 2#3R]zIO
else u*{ _WL[(
data[cur]=temp[i2++]; .a*$WGb
} (Y([^N q
} } Kt?0
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} wY#mL1dF
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改进后的归并排序: 16|S 0 )
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package org.rut.util.algorithm.support; WFP\;(YV
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import org.rut.util.algorithm.SortUtil; 0K ?(xB
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/** DOe KW
* @author treeroot
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* @since 2006-2-2 }=a4uCE
* @version 1.0 `Ny8u")=
*/ "zbE
public class ImprovedMergeSort implements SortUtil.Sort { 5>)jNtZ
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private static final int THRESHOLD = 10; jm\#($gl=
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/* "ux]kfoT
* (non-Javadoc) )\vHIXnfJ1
* {R;M`EU>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yU,xcq~l
*/ p'~5[JR:
public void sort(int[] data) { "\;wMR{
int[] temp=new int[data.length]; v\,%)Z/
mergeSort(data,temp,0,data.length-1); AF]!wUKxy
} v v/,Rgv
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private void mergeSort(int[] data, int[] temp, int l, int r) { I!gj; a?R
int i, j, k; 9
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int mid = (l + r) / 2; PU5mz.&0'
if (l == r) A@(h!Cq
return; T+R I8.#o
if ((mid - l) >= THRESHOLD)
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mergeSort(data, temp, l, mid); *]R0z|MW
else !"%sp6Wc
insertSort(data, l, mid - l + 1); a
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if ((r - mid) > THRESHOLD) !m(L0YH
mergeSort(data, temp, mid + 1, r); ;bZ*6-\!-
else 1Uk~m
insertSort(data, mid + 1, r - mid); JyC&L6[]Z
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for (i = l; i <= mid; i++) { *Ne&SXg
temp = data; c8tC3CrKp=
} g ypq`F
for (j = 1; j <= r - mid; j++) { 7CM03R[P
temp[r - j + 1] = data[j + mid]; h6y4Ii
} ><Z3<7K9
int a = temp[l]; n~u3
int b = temp[r]; J+jmSK%z
for (i = l, j = r, k = l; k <= r; k++) { ih |Ky+ !
if (a < b) { e=sJMzm~
data[k] = temp[i++]; ~h0BT(p/
a = temp; _G #"B{7
} else { l/zC##1+.
data[k] = temp[j--];
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b = temp[j]; V}fKV6 v9
} 7'i#!5
} cO+Xzd;838
} 9<h]OXv
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/** UXPegK!
* @param data Wk#h,p3
* @param l 34wM%@D*c
* @param i t-*|Hfp*^
*/ s^YTI\L
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private void insertSort(int[] data, int start, int len) { SiqX1P
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); }BdVD t
} dIpW!Pj^
} %m{.l4/!O
} 1"&;1Ts
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}