Compilare: user.cpp: In function ‘std::vector<int, std::allocator<int> > make_possible(std::set<int, std::less<int>, std::allocator<int> >)’: user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int get_add(std::vector<int, std::allocator<int> >)’: user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘std::vector<int, std::allocator<int> > make_one_out(std::set<int, std::less<int>, std::allocator<int> >)’: user.cpp:61: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int get_drop(std::vector<int, std::allocator<int> >, std::set<int, std::less<int>, std::allocator<int> >)’: user.cpp:72: warning: comparison between signed and unsigned integer expressions