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:31: warning: comparison between signed and unsigned integer expressions user.cpp:35: warning: left-hand operand of comma has no effect user.cpp:37: warning: left-hand operand of comma has no effect