Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<l[x].size();j++) ^ user.cpp:25:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j>=l[x].size()) ^