Compilare: user.cpp: In function ‘int main()’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:67: warning: format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘long long int’ user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: 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 user.cpp:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result