Compilare: user.cpp: In function ‘void read_data()’: user.cpp:13: warning: format ‘%lld’ expects type ‘long long int*’, but argument 3 has type ‘int*’ user.cpp:13: warning: format ‘%lld’ expects type ‘long long int*’, but argument 4 has type ‘int*’ user.cpp:14: warning: format ‘%lld’ expects type ‘long long int*’, but argument 3 has type ‘int*’ user.cpp:14: warning: format ‘%lld’ expects type ‘long long int*’, but argument 4 has type ‘int*’ user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void print_data()’: user.cpp:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result