Compilare: user.cpp: In function ‘int main()’: user.cpp:64:32: warning: unused variable ‘s’ [-Wunused-variable] unsigned long long s=1; ^ user.cpp:65:27: warning: unused variable ‘z’ [-Wunused-variable] unsigned long z; ^ user.cpp:13:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%llu %llu",&x,&y); ^