Compilare: user.cpp: In function ‘void readData(std::vector<int, std::allocator<int> >&)’: user.cpp:15: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void writeData(std::vector<int, std::allocator<int> >&)’: user.cpp:49: warning: comparison between signed and unsigned integer expressions