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public class Solution {

public List<List<Integer>> permute(int[] nums) {

List<List<Integer>> res = new ArrayList<List<Integer>>();

helper(nums, 0, res);

return res;

}

public void helper(int[] nums, int pos, List<List<Integer>> res){

if(pos == nums.length){

List<Integer> list = new ArrayList<Integer>();

for(int n: nums) list.add(n);

res.add(list);

}

for(int i = pos; i < nums.length; i++){

swap(nums, i, pos);

helper(nums, pos+1, res);

swap(nums, i, pos);

}

}

public void swap(int[] nums, int i, int j){

int temp = nums[i];

nums[i] = nums[j];

nums[j] = temp;

}

}