Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:11:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[go].size(); i++) ^ user.cpp:14:17: warning: unused variable ‘cost’ [-Wunused-variable] int cost=G[go][i].second; ^ user.cpp:21:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[nod].size(); i++) ^ user.cpp:43:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[nod].size(); i++) ^