Compilare: user.cpp: In function ‘int main()’: user.cpp:11:22: warning: integer overflow in expression [-Woverflow] #define INF ((1<<31)-1) ^ user.cpp:44:33: note: in expansion of macro ‘INF’ for (int i=2;i<=n;i++) D[i]=INF; ^ user.cpp:11:22: warning: integer overflow in expression [-Woverflow] #define INF ((1<<31)-1) ^ user.cpp:48:29: note: in expansion of macro ‘INF’ printf("%d ",(D[i]==INF)?0:D[i]); ^ user.cpp:35:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ user.cpp:36:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^ user.cpp:37:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:41:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&a,&b,&c); ^