Compilare: user.cpp: In function ‘void precalc_current_combs(int)’: user.cpp:117:9: warning: unused variable ‘j’ [-Wunused-variable] int j; ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:16:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, input); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:57:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, input); ^