Compilare: user.cpp: In function ‘void read()’: user.cpp:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void rez()’: user.cpp:21: warning: format ‘%lld’ expects type ‘long long int’, but argument 2 has type ‘long int’ user.cpp:12: warning: unused variable ‘cat1’ user.cpp:12: warning: unused variable ‘cat2’ user.cpp: In function ‘int main()’: user.cpp:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result