Compilare: main.cpp: In function 'int main()': main.cpp:17:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("galeti2.in", "r", stdin); ^ main.cpp:18:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("galeti2.out", "w", stdout); ^ main.cpp:22:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lld", &n, &ef); ^