Created
March 12, 2013 21:28
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public class Solution { | |
public ArrayList<ArrayList<Integer>> permuteUnique(int[] num) { | |
// Start typing your Java solution below | |
// DO NOT write main() function | |
return permutation( num, num.length-1, new HashSet<ArrayList<Integer>>()); | |
} | |
ArrayList<ArrayList<Integer>> permutation(int [] num, int end, HashSet<ArrayList<Integer>> set) | |
{ | |
ArrayList<ArrayList<Integer>> result=new ArrayList<ArrayList<Integer>> (); | |
if(end<0) | |
{ | |
result.add(new ArrayList<Integer>()); | |
return result; | |
} | |
int rest=num[end]; | |
ArrayList<ArrayList<Integer>> subResult=permutation(num, end-1, set); | |
for(ArrayList<Integer> list: subResult) | |
{ | |
int size=list.size(); | |
for(int i=0; i<=size; i++) | |
{ | |
list.add(i, rest); | |
if(!set.contains(list)) | |
{ | |
result.add((ArrayList<Integer>)list.clone()); | |
set.add((ArrayList<Integer>)list.clone()); | |
} | |
list.remove(i); | |
} | |
} | |
return result; | |
} | |
} |
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