Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:61:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[kk].size();i++) ^ user.cpp: In function ‘int verifica(int)’: user.cpp:98:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:24:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trafic.out","wt",stdout); ^