Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp:13:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int i=0;i<G[nod].size();i++) ^~~ user.cpp:16:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ v[++nr]=nod; ^