Compilare: user.cpp: In member function ‘const int& BigInt::valAt(int) const’: user.cpp:42:16: warning: returning reference to temporary [-Wreturn-local-addr] return 0; ^ user.cpp: In member function ‘void BigInt::afis()’: user.cpp:49:33: warning: '#' flag used with ‘%d’ gnu_printf format [-Wformat=] printf("%#04d", v[i]); ^ user.cpp: In function ‘int main()’: user.cpp:58:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culmi.in", "r", stdin); ^ user.cpp:59:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("culmi.out", "w", stdout); ^ user.cpp:60:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &K); ^