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快速排序: YX `%A6
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package org.rut.util.algorithm.support; '^1o/C
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import org.rut.util.algorithm.SortUtil; RUc \u93n
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/** $'u\B
* @author treeroot QZ0R :TY
* @since 2006-2-2 w{P6i<J
* @version 1.0 62NkU)u
*/ ;&`:|Hf*
public class QuickSort implements SortUtil.Sort{ `(T!>QVW+g
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/* (non-Javadoc) SY8U"Qc;9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) u9@b<
*/ P' FKk<
public void sort(int[] data) { Qg{WMlyOP
quickSort(data,0,data.length-1); FG _,
} )8]3kQffJ=
private void quickSort(int[] data,int i,int j){ kpT>G$s~gy
int pivotIndex=(i+j)/2; &:#A+4&
//swap $[w|oAwi
SortUtil.swap(data,pivotIndex,j); K051usm
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int k=partition(data,i-1,j,data[j]); mrReast
SortUtil.swap(data,k,j); ,Z4^'1{D
if((k-i)>1) quickSort(data,i,k-1); yI4DVu.
if((j-k)>1) quickSort(data,k+1,j); !3?~#e{_
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} cl2ze
/** NCxn^$/+>9
* @param data 500>
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* @param i @:IL/o*
* @param j xx6S`R6:
* @return $$~a=q,P[
*/ 1!s!wQgS
private int partition(int[] data, int l, int r,int pivot) { wJ(8}eI
do{ "_oLe;?$c
while(data[++l] while((r!=0)&&data[--r]>pivot); .SBc5KX
SortUtil.swap(data,l,r); G)4SWu0<t
} W%H]Uyt
while(l SortUtil.swap(data,l,r); U>1b9G"_
return l; (6o:4|xl0
} :OX$LCi
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} -Fa98nV.WB
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改进后的快速排序: +qZc}
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package org.rut.util.algorithm.support; P_mi)@
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import org.rut.util.algorithm.SortUtil; AW62~*
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/** ?}v}U^
* @author treeroot GGp{b>E+
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* @since 2006-2-2 0hb/`[Q
* @version 1.0 cPm~`
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*/ >z5Oy
public class ImprovedQuickSort implements SortUtil.Sort { y78z>(jV
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private static int MAX_STACK_SIZE=4096; >07shNX
private static int THRESHOLD=10; >waN;&>/
/* (non-Javadoc) %/X2 l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }oV3EIH
*/ M-vC>u3Y
public void sort(int[] data) { bbO+%-(X
int[] stack=new int[MAX_STACK_SIZE]; wyNC|P;j$g
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int top=-1; "W3W:vl!
int pivot; 3 ^pYCK%
int pivotIndex,l,r; :K:f^o]s
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stack[++top]=0; .dt#2a_5q
stack[++top]=data.length-1; d~3GV(M
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while(top>0){ 3m3
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int j=stack[top--]; MHGj vSx
int i=stack[top--]; 2S'AIuIew
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pivotIndex=(i+j)/2; e7h\(`J0lj
pivot=data[pivotIndex]; gfxoJihE
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SortUtil.swap(data,pivotIndex,j); W.z$a.<(rF
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//partition >2nF"?"=
l=i-1; 7Onk!NH
r=j; 4Sqvhz
do{ ^z38<L=z"
while(data[++l] while((r!=0)&&(data[--r]>pivot)); zv`zsqDJ
SortUtil.swap(data,l,r); (2cGHYU3N<
} ktU9LW~
while(l SortUtil.swap(data,l,r); n}+wd9J*!2
SortUtil.swap(data,l,j); W3"vTZJF
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if((l-i)>THRESHOLD){ ]}_p3W "Y9
stack[++top]=i; cgzy0$8dj\
stack[++top]=l-1; L,O>6~9:^1
} ]X/O IfdWe
if((j-l)>THRESHOLD){ j1W
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stack[++top]=l+1; 33O)k*g
stack[++top]=j; @Ap@m6K?q
} sw[<VsxjR
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} 0PR4g}"
//new InsertSort().sort(data); |&9tU
insertSort(data); l.sm~/
} ]~$c~*0g
/** 5sG ]3z+1
* @param data ]aREQ?ma&z
*/ *X%?3"WH8
private void insertSort(int[] data) { L,f^mX0<
int temp; D`1I;Tb#
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Ml'bZLwq
} FpwlV}:
} [SKP|`I>I
} $_ST:h&C
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} B8`R(vu;
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