Compilare: user.cpp: In function ‘int main()’: user.cpp:2:26: warning: integer overflow in expression [-Woverflow] #define INF ((1 << 31) - 1) ^ user.cpp:15:14: note: in expansion of macro ‘INF’ dr = INF; ^ user.cpp:9:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.in","r",stdin); ^ user.cpp:10:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.out","w",stdout); ^ user.cpp:12:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &A, &B); ^