Compilare: user.cpp:21:29: warning: left shift count >= width of type [-Wshift-count-overflow] const long long INF = (1 << 62); ^~ user.cpp: In function ‘int main()’: user.cpp:43:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("guest.in", "r", stdin); ^ user.cpp:44:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("guest.out", "w", stdout); ^