Compilare: user.cpp: In function ‘int main()’: user.cpp:4:22: warning: integer overflow in expression [-Woverflow] #define INF (1<<31) -1 ^ user.cpp:74:32: note: in expansion of macro ‘INF’ for(int i=1;i<=n;++i) d[i]=INF; ^ user.cpp:79:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) ^ user.cpp:4:22: warning: integer overflow in expression [-Woverflow] #define INF (1<<31) -1 ^ user.cpp:92:20: note: in expansion of macro ‘INF’ if(d[i] != INF) printf("%d ",d[i]); ^ user.cpp:65:37: 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:66:39: 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:67:24: 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%d",&x,&y,&c); ^