Compilare: user.cpp: In function ‘int Inv(int)’: user.cpp:24:19: warning: variable ‘g’ set but not used [-Wunused-but-set-variable] int x,useless,g; ^ user.cpp: In function ‘void read()’: user.cpp:50:20: warning: unused variable ‘answer’ [-Wunused-variable] long long k,n, answer, stirling=0 ,fact; ^ user.cpp:51:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xnumere.in", "r", stdin); ^ user.cpp:52:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xnumere.out","w",stdout); ^ user.cpp:53:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %d %lld", &k, &x, &n); ^