Modern c++ : Awesome Utility codes to increase productivity

merge two sorted arrays into one sorted array :

vector<int> res ; //nums1 and nums2 are two sorted vectors
std::merge(nums1.begin() , nums1.end() , nums2.begin(), nums2.end(), back_inserter(res));

merge two sorted arrays into one sorted arrays with unique values

vector<int> res ; //nums1 and nums2 are two sorted vectors
std::set_union(nums1.begin() , nums1.end() , nums2.begin(), nums2.end(), back_inserter(res));