Compilare: user.cpp: In function ‘void df(int)’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v2[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:70:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[i].size();j++) ^