aplusb.cpp: In function 'std::vector<long long int> smallest_sums(long long int, std::vector<long long int>, std::vector<long long int>)':
aplusb.cpp:5:7: error: 'sort' is not a member of 'std'
5 | std::sort(A.begin(),A.end());
| ^~~~
aplusb.cpp:6:7: error: 'sort' is not a member of 'std'
6 | std::sort(B.begin(),B.end());
| ^~~~
aplusb.cpp:12:14: error: 'upper_bound' is not a member of 'std'; did you mean 'lower_bound'?
12 | ans+=std::upper_bound(B.begin(),B.end(),mid-A[i])-B.begin();
| ^~~~~~~~~~~
| lower_bound
aplusb.cpp:26:7: error: 'sort' is not a member of 'std'
26 | std::sort(ans.begin(),ans.end());
| ^~~~