Compilare: user.cpp: In function ‘int main()’: user.cpp:63:16: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘int64_t* {aka long long int*}’ [-Wformat=] scanf("%d", &n); ^ user.cpp:60:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fact.in", "r", stdin); ^ user.cpp:61:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fact.out", "w", stdout); ^ user.cpp:63:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^