Compilare: user.cpp: In function ‘int main()’: user.cpp:26:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-1 ^ user.cpp:50:29: note: in expansion of macro ‘INF’ for (i=1;i<=N;i++) D[i]=INF; ^ user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<G[x].size();i++) ^ user.cpp:26:21: warning: integer overflow in expression [-Woverflow] #define INF (1<<31)-1 ^ user.cpp:69:44: note: in expansion of macro ‘INF’ for (i=2;i<=N;i++) printf("%d ",(D[i]==INF)?0:D[i]); ^ user.cpp:41:37: 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:42:39: 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:43:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&M); ^ user.cpp:47:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&z); ^