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快速排序: iBp 71x65
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package org.rut.util.algorithm.support; E0xUEAO
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import org.rut.util.algorithm.SortUtil; ;f=:~go
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/** u+I-!3J87
* @author treeroot /D1Bf:'(
* @since 2006-2-2 gW/H#T,
* @version 1.0 ,=$yvZs4[]
*/ _\@i&3hkx
public class QuickSort implements SortUtil.Sort{ d2.n^Q"?3
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/* (non-Javadoc) ]DmqhK`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Qbl6~>T
*/ W.MJyem
public void sort(int[] data) { g+ 2SB5 2D
quickSort(data,0,data.length-1); R3?~+y&
} Vq9hAD|k
private void quickSort(int[] data,int i,int j){ o&(%:|
int pivotIndex=(i+j)/2; \lKQDct. -
//swap /rvXCA)j
SortUtil.swap(data,pivotIndex,j); t$l[ 4
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int k=partition(data,i-1,j,data[j]); ;Ic3th%u
SortUtil.swap(data,k,j); }s}9@kl;&
if((k-i)>1) quickSort(data,i,k-1); &CUkR6
if((j-k)>1) quickSort(data,k+1,j); >x2T'
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} L'aMXNO
/** $ZcmE<7k
* @param data ^jf$V#z0/
* @param i y*uL,WH
* @param j \?3];+c9
* @return D|e 6$O5o
*/ 6b<t|zb
private int partition(int[] data, int l, int r,int pivot) { AQQj]7Y
do{ JSGUl4N
while(data[++l] while((r!=0)&&data[--r]>pivot); g-+p(Ll|
SortUtil.swap(data,l,r); N..9N$+(
} ~Rv U+D
while(l SortUtil.swap(data,l,r); e% 5!
return l; (a^F`#]
} Nz!AR$
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} ,x{5,K.yWq
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改进后的快速排序: &v 5yo}s
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package org.rut.util.algorithm.support; t8?+yG;
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import org.rut.util.algorithm.SortUtil; QtN 0|q{af
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/** L {B#x@9tQ
* @author treeroot L"}@>&6
* @since 2006-2-2 lPFMNRt~8
* @version 1.0 _I$]L8hC
*/ <7PtC,74
public class ImprovedQuickSort implements SortUtil.Sort { A)`M*(~
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private static int MAX_STACK_SIZE=4096; Z<&:
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private static int THRESHOLD=10; TzK?bbgr!
/* (non-Javadoc) HH+rib'u
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xPb`CY7
*/ C{2UPG4 x
public void sort(int[] data) { |9_e2OwH
int[] stack=new int[MAX_STACK_SIZE]; )9<)mV*EB(
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int top=-1; X0!48fL*
int pivot; 6?,r d
int pivotIndex,l,r; !0fK*qIL
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stack[++top]=0; rtzxMCSEU
stack[++top]=data.length-1; 6b]vHT|p
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while(top>0){ pAa{,,Qc
int j=stack[top--]; \{UiGCK
int i=stack[top--]; l;|1C[V
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pivotIndex=(i+j)/2; JT_#>',
pivot=data[pivotIndex]; bjvi`jyL3k
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SortUtil.swap(data,pivotIndex,j); ")sq?1?X
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//partition el[6E0!@
l=i-1; w\@Anwj#L
r=j; ^3r2Q?d\
do{ z ,ledTl
while(data[++l] while((r!=0)&&(data[--r]>pivot)); a(J~:wgd
SortUtil.swap(data,l,r); oa9T3gQ?
} \7/xb{z|
while(l SortUtil.swap(data,l,r); DAvAozM
SortUtil.swap(data,l,j); 9k*'5(D4S
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if((l-i)>THRESHOLD){ UhEnW8^bz1
stack[++top]=i; wEkW=
stack[++top]=l-1; 3b[_0
} (JF\%Yj/
if((j-l)>THRESHOLD){ 7vHU49DV
stack[++top]=l+1; 54'z"S:W
stack[++top]=j; 3gGF?0o
} T
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} |5FyfDaFBX
//new InsertSort().sort(data); ^(6.M\Q
insertSort(data); ml3]CcKn
} H7\EvIM=
/** ;ga~ae=Fg
* @param data Z+vLEEX*uQ
*/ c3Mql+@
private void insertSort(int[] data) { s\KV\5\o
int temp; S&QZ"4jq
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); goxgJOiB
} (>Tu~Vo
} =UYc~VUYnT
} ~5JXY5*o
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} IB?5y~+h
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