Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:29:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-1 ^ user.cpp:44:32: note: in expansion of macro ‘INF’ for (i=2;i<=N;i++) dist[i]=INF; ^ user.cpp:29:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-1 ^ user.cpp:52:28: note: in expansion of macro ‘INF’ if (dist[*it]==INF) ^ user.cpp: In function ‘int main()’: user.cpp:63:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amici2.in","r",stdin); ^ user.cpp:64:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amici2.out","w",stdout); ^ user.cpp:65:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^ user.cpp:68:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&M); ^ user.cpp:71:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^