Compilare: user.cpp: In function ‘void Dijkstra()’: user.cpp:38:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graf[nod].size();i++) ^ user.cpp:36:13: warning: unused variable ‘cost’ [-Wunused-variable] int cost=(*Heap.begin()).first; ^ user.cpp: In function ‘int main()’: user.cpp:49:37: 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:50:39: 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: In function ‘void Read()’: user.cpp:61:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&M); ^ user.cpp:66:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z); ^