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快速排序: U!Mf]3
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package org.rut.util.algorithm.support; T%~SM5
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import org.rut.util.algorithm.SortUtil; #Cx%OIi[f
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/** #j.FJFGX
* @author treeroot U(Z!J6{c
* @since 2006-2-2 5*1#jiq
* @version 1.0 P5P<"
*/ KSsWjF}d
public class QuickSort implements SortUtil.Sort{ bl$j%gI%,
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/* (non-Javadoc) aaT5u14%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) & g$rrpTzv
*/ t)'dF*L
public void sort(int[] data) { CW;m
quickSort(data,0,data.length-1); p&O8qAaO
} Km"&mT $
private void quickSort(int[] data,int i,int j){ 10O3Z9
int pivotIndex=(i+j)/2; v#F-<?Vv
//swap BV1u,<T"
SortUtil.swap(data,pivotIndex,j); b!,ja?
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int k=partition(data,i-1,j,data[j]); j/'
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SortUtil.swap(data,k,j); +`Fb_m)f
if((k-i)>1) quickSort(data,i,k-1); F9O`HFVK
if((j-k)>1) quickSort(data,k+1,j); [Xq<EEb
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} +(y>qd
/** m_$JWv\|\
* @param data s-%J5_d f
* @param i ZMJ3NN]F
* @param j fB7ljg
* @return j-6v2MH
*/ 1w17L]4
private int partition(int[] data, int l, int r,int pivot) { AA2ui%
do{ *F|+2?a:$
while(data[++l] while((r!=0)&&data[--r]>pivot); i pwW%"6
SortUtil.swap(data,l,r); |
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} sS|<&3
while(l SortUtil.swap(data,l,r); 71*>L}H
return l; g}YToOs
} ee^4KKsh\
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} ,H@TYw
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改进后的快速排序: L&QtHSzy
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package org.rut.util.algorithm.support; #<UuI9
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import org.rut.util.algorithm.SortUtil; zu<>"5}]
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/** 77tZp @>hn
* @author treeroot [NjajA~z>F
* @since 2006-2-2 %]!?{U\*k
* @version 1.0 ?;fv!'?%
*/ F=:c5z
public class ImprovedQuickSort implements SortUtil.Sort { Xj(>.E{~H
RW)k_#%=
private static int MAX_STACK_SIZE=4096; .T{U^0 )
private static int THRESHOLD=10; 0S_Ra+e
/* (non-Javadoc) PYaOH_X.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3}yraX6r!
*/ 6kC)\uy
public void sort(int[] data) { GV=V^Fl .
int[] stack=new int[MAX_STACK_SIZE]; ;2BPPZ
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int top=-1; so'eZ"A:
int pivot; ^&HI+M
int pivotIndex,l,r; *6'_5~G
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stack[++top]=0; a9L0f BRy
stack[++top]=data.length-1; IG>>j}
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while(top>0){ ,znL,%s
int j=stack[top--]; 2AmR(vVa"
int i=stack[top--]; } cRi
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pivotIndex=(i+j)/2; N:5b1TdI,
pivot=data[pivotIndex]; H_v/}DEG
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SortUtil.swap(data,pivotIndex,j); -g~iE]x6Y
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//partition Ed4_<:
l=i-1; v!iWzN
r=j; 8}]l9"q(
do{ ^BQ>vI'.4
while(data[++l] while((r!=0)&&(data[--r]>pivot)); [@jp9D
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SortUtil.swap(data,l,r); x`wZtv\
} (gFQK[
while(l SortUtil.swap(data,l,r); E\W;:p,{A
SortUtil.swap(data,l,j); l@(t^68OD
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if((l-i)>THRESHOLD){ &IxxDvP3k
stack[++top]=i; `>$gy/N
stack[++top]=l-1; 9(V=Ubj
} `W6:=H
if((j-l)>THRESHOLD){ Z1E`I89<
stack[++top]=l+1; }//8$Z<(
stack[++top]=j; EY=\C$3J:
} N^)<)?
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} $yP'k&b!
//new InsertSort().sort(data); >^2ZM
insertSort(data); WMt&8W5
} 1)nM#@%](h
/** iPR!JX
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* @param data +Y_Q?/M@8
*/ LbLbJ{68
private void insertSort(int[] data) { /1s 9;'I
int temp; S}XB
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); [M,27
} HY@kw>I
} 0jl:Yzo&\
} U)IsTk~}O
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} _"FbjQ"
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