Compilare: user.cpp: In function ‘void dfs(int, int*, std::vector<int>*, bool, bool)’: user.cpp:46:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<LA[u].size(); ++i) { ^ user.cpp: In function ‘void solve()’: user.cpp:70:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<LA[u].size(); ++i) { ^ user.cpp:79:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); ++i) printf("%d %d\n", sol[i].first, sol[i].second); ^