Compilare: user.cpp: In function 'void print(std::vector<short int, std::allocator<short int> >)': user.cpp:19: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'std::pair<std::pair<long long int, long long int>, unsigned char> encode(std::vector<short int, std::allocator<short int> >)': user.cpp:32: warning: comparison between signed and unsigned integer expressions