2sec.cpp: In constructor 'InputReader::InputReader(const char*)': 2sec.cpp:9: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result 2sec.cpp: In constructor 'InputReader::InputReader(const char*)': 2sec.cpp:9: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result 2sec.cpp: In constructor 'InputReader::InputReader(const char*)': 2sec.cpp:9: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result 2sec.cpp: In member function 'void InputReader::advance()': 2sec.cpp:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result