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Permutations II LeetCode Solution

Problem – Permutations II LeetCode Solution

Given a collection of numbers, nums, that might contain duplicates, return all possible unique permutations in any order.

Example 1:

Input: nums = [1,1,2]

Example 2:

Input: nums = [1,2,3]
Output: [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]


  • 1 <= nums.length <= 8
  • -10 <= nums[i] <= 10

Permutations II LeetCode Solution in Java

public class Solution {
    public List<List<Integer>> permuteUnique(int[] nums) {
        List<List<Integer>> res = new ArrayList<List<Integer>>();
        if(nums==null || nums.length==0) return res;
        boolean[] used = new boolean[nums.length];
        List<Integer> list = new ArrayList<Integer>();
        dfs(nums, used, list, res);
        return res;

    public void dfs(int[] nums, boolean[] used, List<Integer> list, List<List<Integer>> res){
            res.add(new ArrayList<Integer>(list));
        for(int i=0;i<nums.length;i++){
            if(used[i]) continue;
            if(i>0 &&nums[i-1]==nums[i] && !used[i-1]) continue;

Permutations II LeetCode Solution in C++

class Solution {
    void recursion(vector<int> num, int i, int j, vector<vector<int> > &res) {
        if (i == j-1) {
        for (int k = i; k < j; k++) {
            if (i != k && num[i] == num[k]) continue;
            swap(num[i], num[k]);
            recursion(num, i+1, j, res);
    vector<vector<int> > permuteUnique(vector<int> &num) {
        sort(num.begin(), num.end());
        vector<vector<int> >res;
        recursion(num, 0, num.size(), res);
        return res;

Permutations II LeetCode Solution in Python

def permuteUnique(self, nums):
    ans = [[]]
    for n in nums:
        new_ans = []
        for l in ans:
            for i in xrange(len(l)+1):
                if i<len(l) and l[i]==n: break              #handles duplication
        ans = new_ans
    return ans
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