Compilare: user.cpp: In function ‘int main()’: user.cpp:27: warning: format ‘%ld’ expects type ‘long int*’, but argument 2 has type ‘long long unsigned int*’ user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp:25: 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 ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result