Compilare: user.cpp: In function ‘void lipeste(std::vector<Interv>&, std::vector<Interv>&)’: user.cpp:68:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0), j(0); i < a.size() && j < b.size(); ) { ^ user.cpp:68:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0), j(0); i < a.size() && j < b.size(); ) { ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:32:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:10:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^