Compilare: user.cpp: In function ‘void afis(const BigNumber&)’: user.cpp:68:31: warning: '#' flag used with ‘%d’ gnu_printf format [-Wformat=] printf("%#04d", a.v[i]); ^ user.cpp: In function ‘int main()’: user.cpp:77:15: warning: unused variable ‘i’ [-Wunused-variable] int n, k, i; ^ user.cpp:75:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta.in", "r", stdin); ^ user.cpp:76:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta.out", "w", stdout); ^ user.cpp:78:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^