Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:57:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[node].size();i++) ^ user.cpp:68:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:80:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algoritm.in","r",stdin); ^ user.cpp:81:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algoritm.out","w",stdout); ^