Contains Duplicate

c++

class Solution {public:    bool containsDuplicate(vector<int>& nums) {        unordered_set<int> dict;        for(auto v : nums){            dict.insert(v);        }        if(dict.size() == nums.size())            return false;        return true;    }};

python

class Solution(object):    def containsDuplicate(self, nums):        """        :type nums: List[int]        :rtype: bool        """        s = set(nums)        if len(s)==len(nums):            return False        return True