Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<niv[i].size();j++) ~^~~~~~~~~~~~~~