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快速排序: n0FzDQt26
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package org.rut.util.algorithm.support; ;>%wf3e
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import org.rut.util.algorithm.SortUtil; RNopx3
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/** SAU` u]E
* @author treeroot `[&%fTW+
* @since 2006-2-2 Z kBWVZb
* @version 1.0 kZ0z]Y
*/ $T_>WUiK
public class QuickSort implements SortUtil.Sort{ +Mb}70^
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/* (non-Javadoc) :<H4hYt2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yb-4[C:i
*/ _=9m[
public void sort(int[] data) { $k+XH+1CW
quickSort(data,0,data.length-1); Z6nQW53-
} wkY$J\J
private void quickSort(int[] data,int i,int j){ `NyO|9/4
int pivotIndex=(i+j)/2; hG}gKs
//swap w}YcAnuB{%
SortUtil.swap(data,pivotIndex,j); R1Fcd@DWD
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int k=partition(data,i-1,j,data[j]); }&]T0U`@
SortUtil.swap(data,k,j); tlYB'8bJY
if((k-i)>1) quickSort(data,i,k-1); N+vsQ!Qz
if((j-k)>1) quickSort(data,k+1,j); W!|l_/L'
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} L=5Y^f'aU
/** a{Y8hR
* @param data Z?qc4Cg
* @param i lpjby[S
* @param j FjW%M;H
* @return :|-^et]a8
*/ 7HJH9@8V
private int partition(int[] data, int l, int r,int pivot) { \0)2 u[7
do{ RLO<5L
while(data[++l] while((r!=0)&&data[--r]>pivot); @cQ
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SortUtil.swap(data,l,r); BnG{)\s
} d>0 j!+s
while(l SortUtil.swap(data,l,r); ;)vs=DK:)
return l; 4O4}C#6(4
} z`YAOhD*h4
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} lI3d
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改进后的快速排序: @vO~'Xxq!
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package org.rut.util.algorithm.support; 6ZQ$5PY
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import org.rut.util.algorithm.SortUtil; bRJ]avR
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/** 6&btAwvOHx
* @author treeroot >}r
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* @since 2006-2-2 lr[&*v?h
* @version 1.0 S-79uo
*/ (\4YBaGd
public class ImprovedQuickSort implements SortUtil.Sort { \*#E4`Y
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private static int MAX_STACK_SIZE=4096; {~V_6wY g
private static int THRESHOLD=10; X=VaBy4#
/* (non-Javadoc) y(j vl|z[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i x_a
*/ jF{)2|5
public void sort(int[] data) { _@Y17L.
int[] stack=new int[MAX_STACK_SIZE]; LbnF8tj}h
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int top=-1; b{,vZhP-
int pivot; j?(@x>HA
int pivotIndex,l,r; .p'\@@o5
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stack[++top]=0; DCgiTT\
stack[++top]=data.length-1; 7??j}ob>
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while(top>0){ hOe$h,E']
int j=stack[top--]; q X]ej2
int i=stack[top--]; iJk/fvi
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pivotIndex=(i+j)/2; *jl_,0g]
pivot=data[pivotIndex]; {/XU[rn
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SortUtil.swap(data,pivotIndex,j); /?C6oj1
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//partition o2^?D`Jr
l=i-1; ?e23[
r=j; h}%yG{'/M=
do{ ,]=Qgn
while(data[++l] while((r!=0)&&(data[--r]>pivot)); aT=V/Xh}d
SortUtil.swap(data,l,r); ScC!?rTW~7
} {ZgycMS
while(l SortUtil.swap(data,l,r); 4OdK@+-8U
SortUtil.swap(data,l,j); Ot3+<{
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if((l-i)>THRESHOLD){
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stack[++top]=i; 7P DD
stack[++top]=l-1; leEzfbb{'.
} .DcuJC=
if((j-l)>THRESHOLD){ @TnAO8Q>XD
stack[++top]=l+1; :yAvo4)
stack[++top]=j; g%d&>y?1r
} l5_%Q+E_
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} Q$2^m(?;
//new InsertSort().sort(data); wqp(E+&
insertSort(data); yGPi9j{QXq
} +,}CuF
/** 0'Qo eFKG
* @param data 2
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*/ z(beT e
private void insertSort(int[] data) {
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int temp; EB>rY
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ?T:$:IHw
} [>f4&yY
} @0rwvyE=+3
} 3WF6bJN
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} Q"H1(kG|
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