Compilare: user.cpp: In function ‘int main()’: user.cpp:78:30: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘long long int*’ [-Wformat=] fprintf(out, "%lld", &ans); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:11:43: 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 member function ‘void InputReader::advance()’: user.cpp:33:47: 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); ^