LeetCode 0047 - Permutations II

Permutations II

Desicription

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

For example,

[1,1,2] have the following unique permutations:

代码语言：javascript复制

[
  [1,1,2],
  [1,2,1],
  [2,1,1]
]

Solution

代码语言：javascript复制

class Solution {
public:
    vector<vector<int>> permuteUnique(vector<int>& nums) {
        vector<vector<int>> res;
        sort(nums.begin(), nums.end());
        do
            res.push_back(nums);
        while(next_permutation(nums.begin(), nums.end()));
        return res;
    }
};

duplicates numbers return unique

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