import java.util.ArrayList;
import java.util.List;
public class Permutations {
public List<List<Integer>> permutation(int nums[]) {
List<List<Integer>> answer = new ArrayList<>();
backtrack(answer, new ArrayList<>(), nums);
return answer;
}
public void backtrack(List<List<Integer>> answer, List<Integer> tempList, int [] nums) {
if(tempList.size() == nums.length){
answer.add(new ArrayList<>(tempList));
} else{
for(int i = 0; i < nums.length; i++){
if(tempList.contains(nums[i])) {
continue; // element already exists, skip
}
tempList.add(nums[i]);
backtrack(answer, tempList, nums);
tempList.remove(tempList.size() - 1);
}
}
}
public static void main(String args[]) {
Permutations p = new Permutations();
int nums[] = {1,2,3};
System.out.println(p.permutation(nums));
}
}
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