'''

class Solution {

public:

bool containsDuplicate(vector<int>& nums) {

int n = nums.size();

if(nums.empty())

{

return false;

}

sort(nums.begin(),nums.end());

for(int i = 0;i<n-1;++i)

{

if(nums[i] == nums[i+1])

{

return true;

}

}

return false;

}

};

'''