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快速排序: cS. -7
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package org.rut.util.algorithm.support; dVQ-k
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import org.rut.util.algorithm.SortUtil; n 3lE,b
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/** ^0#;YOk
* @author treeroot "7v-`i
* @since 2006-2-2 k@ K7yK
* @version 1.0 KE1ao9H8wR
*/ zh$}~RG[
public class QuickSort implements SortUtil.Sort{ < Z|Ep1W
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/* (non-Javadoc) vm'5s]kdh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @ w>zF/
*/ *FfMI
public void sort(int[] data) { up2+s#
quickSort(data,0,data.length-1); (Z}>1WRju
} U#n#7G6fRp
private void quickSort(int[] data,int i,int j){ KK,Z"){
int pivotIndex=(i+j)/2; zFQ&5@43
//swap #XnPsU<J
SortUtil.swap(data,pivotIndex,j); $o +5/c?|
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int k=partition(data,i-1,j,data[j]); cD4
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SortUtil.swap(data,k,j); TM8=U-A
if((k-i)>1) quickSort(data,i,k-1); y}v+c%d
if((j-k)>1) quickSort(data,k+1,j); &vovA} F
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} {T'GQz+R"
/** KI]wm
* @param data 4 V1bLm
* @param i ,+;:3gRk9
* @param j @R m-CWa
* @return D{v8q)5r
*/ -AYA~O(&
private int partition(int[] data, int l, int r,int pivot) { !WkIi^T
do{ 3@n>*7/E
while(data[++l] while((r!=0)&&data[--r]>pivot); &/A8-:m
SortUtil.swap(data,l,r); 1G7b%yPA
} < pTTo
while(l SortUtil.swap(data,l,r); 3jogD
return l; E1&b#TE6O
} z5*=MlZ)R.
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} @=5qT]%U3J
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改进后的快速排序: L&-hXGx=7
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package org.rut.util.algorithm.support; \#'TNmS
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import org.rut.util.algorithm.SortUtil; #,(sAj
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/** >O/D!j|
* @author treeroot `d 2,*KR
* @since 2006-2-2 ki;UY~
* @version 1.0 dP]1tAO,y
*/ O|cu.u|
public class ImprovedQuickSort implements SortUtil.Sort { %~NH0oFO
ZAuWx@}
private static int MAX_STACK_SIZE=4096; Zc"B0_&?:7
private static int THRESHOLD=10; Q/I)V2a1i
/* (non-Javadoc) nH !3(X*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }]UB;id'
*/ :
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public void sort(int[] data) { U"f??y%)
int[] stack=new int[MAX_STACK_SIZE]; S<nq8Ebmw
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int top=-1; +]:2\TTGI
int pivot; 7:NmCpgL!
int pivotIndex,l,r; RQW6N??C
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stack[++top]=0; ":Edu,6O
stack[++top]=data.length-1; gLE7Edcp6V
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while(top>0){ *pzq.#
int j=stack[top--]; wyxGe<1
int i=stack[top--]; :`vP}I ^
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pivotIndex=(i+j)/2; ~9Cz6yF
pivot=data[pivotIndex]; uk`8X`'
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SortUtil.swap(data,pivotIndex,j); fR-C0"c
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//partition >i,iOx|E-
l=i-1; %ICglF R
r=j; S06Hs~>Y
do{ f!t69nd%L
while(data[++l] while((r!=0)&&(data[--r]>pivot)); \
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SortUtil.swap(data,l,r); /"qcl7F
} V_U'P>_I
while(l SortUtil.swap(data,l,r); M~6@20$oW
SortUtil.swap(data,l,j); O$!*%TL
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if((l-i)>THRESHOLD){ S\NL+V?7h
stack[++top]=i; e yw'7
stack[++top]=l-1; d6 _C"r
} ^ons:$0h
if((j-l)>THRESHOLD){ w8~K/>!f
stack[++top]=l+1; +UWU|:
stack[++top]=j; BRG|Asg(
} L$v^afP?
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} ZC^C
//new InsertSort().sort(data); }UyQ# U
insertSort(data); 3mt%!}S
} 6\dX
/** Md;/nJO~{
* @param data VU!w!GN]Y
*/ -[#n+`M
private void insertSort(int[] data) { ~bA,GfSn0
int temp; _.18z+
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); SjcL#S($&Y
} BZ+-p5]-
} w3*-^: ?j
} \X}8q
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} YwT-T,oD
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