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Problem46.java

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import java.util.*;

class Problem46 {

public static void main(String[] args) {

int[] nums = new int[]{1, 2, 3, 4};

System.out.println(new Problem46().permute(nums));

}

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

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

permute(list, nums, 0);

return list;

}

public void permute(List<List<Integer>> list, int[] nums, int start) {

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

if(start == nums.length-1) {

return;

} else {

permute(list, nums, start++);

if (list.size() > 0) {

for (int i =0; i < list.size(); i++) {

list.get(i).add(nums[start]);

}

}

}

}

}