Compilare: user.cpp: In function ‘int main()’: user.cpp:69:13: warning: unused variable ‘q’ [-Wunused-variable] int i,n,q,x,p,c,poz; ^ user.cpp:69:17: warning: unused variable ‘p’ [-Wunused-variable] int i,n,q,x,p,c,poz; ^ user.cpp:69:19: warning: unused variable ‘c’ [-Wunused-variable] int i,n,q,x,p,c,poz; ^ user.cpp:69:21: warning: unused variable ‘poz’ [-Wunused-variable] int i,n,q,x,p,c,poz; ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:10:47: 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); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:32:51: 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); ^