Compilare: user.cpp: In function ‘int main()’: user.cpp:102:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (MAX_STEP * 2 <= values.size()) { ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:69:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, MAX_BUFFER_SIZE, 1, file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:61:52: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, MAX_BUFFER_SIZE, 1, file); ^