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快速排序: +-'`Q Ae
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package org.rut.util.algorithm.support; *di&%&f
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import org.rut.util.algorithm.SortUtil; e|35|I '
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/** +6wx58.B&
* @author treeroot T R+Q4Y:
* @since 2006-2-2 SG1&a:c+.
* @version 1.0 es{cn=\s
*/ <)=3XEcb
public class QuickSort implements SortUtil.Sort{ |:\$n}K
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/* (non-Javadoc) 54;l*}8Hl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t.gq5Y.[
*/ PV?1g|tYv
public void sort(int[] data) { eR(\s_`
quickSort(data,0,data.length-1); sf<Q#ieTxY
} Ixyvn#ux)
private void quickSort(int[] data,int i,int j){ Bd/}
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int pivotIndex=(i+j)/2; i=x.tsJ:hB
//swap ?hP<@L6K
SortUtil.swap(data,pivotIndex,j); \IO$+Guh
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int k=partition(data,i-1,j,data[j]); ]L[JS^#7
SortUtil.swap(data,k,j); PjiNu.>2(
if((k-i)>1) quickSort(data,i,k-1); t00\yb^vJ8
if((j-k)>1) quickSort(data,k+1,j); 6sO
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} BYkVg2D(
/** 8 /5sv
* @param data
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* @param i EKV+?jj$
* @param j ce 7Yr*ZB
* @return n.=e)*
*/ o",f(v&u%
private int partition(int[] data, int l, int r,int pivot) { Tyg$`\#
do{ /h1dm,
while(data[++l] while((r!=0)&&data[--r]>pivot); 8Pl+yiB/o`
SortUtil.swap(data,l,r); ppPG+[ cz
} ^=aml
while(l SortUtil.swap(data,l,r); bS_y_9K
return l; uEc0/a :.
} cfrvy^>,
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} |G|*
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改进后的快速排序: /5L' 9e
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package org.rut.util.algorithm.support; wUh3Hd'
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import org.rut.util.algorithm.SortUtil; y|&.v<
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/** wrZ7Sr!/V
* @author treeroot UrD=|-r`
* @since 2006-2-2 ;PuyA
* @version 1.0 U-wq- GT
*/ 6R$F =MB
public class ImprovedQuickSort implements SortUtil.Sort { Y&K<{KA\4
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private static int MAX_STACK_SIZE=4096; mf
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private static int THRESHOLD=10; ~%cSckE
/* (non-Javadoc) BXQ\A~P\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CVyx lc>
*/ =F",D=
public void sort(int[] data) { {[YqGv=fF
int[] stack=new int[MAX_STACK_SIZE]; RT8_@8
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int top=-1; 0})7of
int pivot; Wto@u4
int pivotIndex,l,r; `'A(`. CL
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stack[++top]=0; _WRR
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stack[++top]=data.length-1; 4Zv.[V]iOO
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while(top>0){ :,xyVb+
int j=stack[top--]; ^P3g9'WK
int i=stack[top--]; '$2oSd
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pivotIndex=(i+j)/2; twYB=68
pivot=data[pivotIndex]; o=QRgdPD
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SortUtil.swap(data,pivotIndex,j); i/C
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//partition ,T,B0
l=i-1; >q}
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r=j; Z=e[
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do{ vy2*BTU?
while(data[++l] while((r!=0)&&(data[--r]>pivot)); =,/A\F
SortUtil.swap(data,l,r); !%Z)eO~Z
} CA~em_dC
while(l SortUtil.swap(data,l,r); 0x3 h8fs
SortUtil.swap(data,l,j); h=iA;B^>
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if((l-i)>THRESHOLD){ kb>Vw<NtE
stack[++top]=i; :uU]rBMo
stack[++top]=l-1; [t"_}t =w
} VrAXOUJw6
if((j-l)>THRESHOLD){ 0,"n-5Im
stack[++top]=l+1; m-Z'K_oQ
stack[++top]=j; c1)BGy li
} U 3wsWSO
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} qJbhPY8Ak
//new InsertSort().sort(data); [i<$ZP
insertSort(data); 8a":[Q[
} f2R+5`$
/** ;QvvU[eb
* @param data laD.or
*/ &8:iB {n
private void insertSort(int[] data) { %(dV|,|v
int temp; n}ZBU5_
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ;*j6d3E
} P&-D0T_
} @]y{M;
} 8IT_mjj
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} @y;tk$e
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