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import java.util.ArrayList; | |
import java.util.Arrays; | |
import java.util.LinkedList; | |
public class Q_9_4 { | |
// LinkedList<LinkedList<Integer>> subsets; | |
// | |
// public Q_9_4(int[] set){ | |
// subsets = new LinkedList<LinkedList<Integer>>(); | |
// | |
// } | |
public ArrayList<ArrayList<Integer>> getSubsets(ArrayList<Integer> set){ | |
ArrayList<ArrayList<Integer>> allsubsets = new ArrayList<ArrayList<Integer>>(); | |
int max = 1 << set.size(); | |
for(int k = 0;k < max; k++){ | |
ArrayList<Integer> subset = converIntToSet(k,set); | |
allsubsets.add(subset); | |
} | |
return allsubsets; | |
} | |
public ArrayList<Integer> converIntToSet(int x, ArrayList<Integer> set) { | |
// TODO Auto-generated method stub | |
ArrayList<Integer> subset = new ArrayList<Integer>(); | |
int idx = 0; | |
for(int k = x;k > 0; k >>= 1){ | |
//System.out.println(Integer.toBinaryString(k)); | |
if((k & 1) ==1){ | |
subset.add(set.get(idx)); | |
} | |
idx ++; | |
} | |
return subset; | |
} | |
public static void main(String[] args){ | |
Q_9_4 testcase=new Q_9_4(); | |
ArrayList<Integer> set = new ArrayList<Integer>(); | |
set.add(0); | |
set.add(2); | |
set.add(3); | |
System.out.println(set); | |
System.out.println(testcase.getSubsets(set)); | |
} | |
} |
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