Compilare: user.cpp: In function ‘int main()’: user.cpp:8: warning: format ‘%llu’ expects type ‘long long unsigned int*’, but argument 3 has type ‘unsigned int*’ user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result