Compilare: user.cpp: In function ‘void read()’: user.cpp:13:28: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 4 has type ‘long long int*’ [-Wformat=] fscanf(f,"%d %ld",&n,&k); ^ user.cpp:13:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %ld",&n,&k); ^