Compilare: user.cpp: In function ‘int main()’: user.cpp:34: warning: format ‘%llu’ expects type ‘long long unsigned int’, but argument 2 has type ‘unsigned int’ user.cpp:5: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result