Compilare: user.cpp: In function ‘bool Check()’: user.cpp:270:7: warning: unused variable ‘line’ [-Wunused-variable] int line = 0; ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:41:41: 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:19:39: 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); ^