Compilare: user.cpp: In function ‘void Rezolva(std::vector<long int, std::allocator<long int> >&, long int)’: user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: array subscript has type ‘char’ user.cpp:39: warning: comparison between signed and unsigned integer expressions user.cpp:48: warning: comparison between signed and unsigned integer expressions