Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:25:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:67:14: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<sol; ^