Compilare: user.cpp: In function ‘void BFS()’: user.cpp:13:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-1 ^ user.cpp:25:33: note: in expansion of macro ‘INF’ for (i=1;i<=N;i++) costX[i]=INF,costY[i]=INF; ^ user.cpp:13:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-1 ^ user.cpp:25:46: note: in expansion of macro ‘INF’ for (i=1;i<=N;i++) costX[i]=INF,costY[i]=INF; ^ user.cpp: In function ‘int main()’: user.cpp:57:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in","r",stdin); ^ user.cpp:58:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out","w",stdout); ^ user.cpp:59:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&N,&M,&nodS,&nodF); ^ user.cpp:63:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^