class Solution {
public:
    int repeatedNTimes(vector<int>& nums) {
        sort(nums.begin(),nums.end());
        int sum = 0;
        int tmp = 0;
        for(int i=0;i<nums.size()-1;i++)
        {
            if(nums[i] == nums[i+1])
            {
                return nums[i];
            }
        }
        return -1;
    }
};