Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:23:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < query[nod].size(); i++) ^ user.cpp:25:13: warning: unused variable ‘first’ [-Wunused-variable] int first = query[nod][i].first; ^ user.cpp:26:13: warning: unused variable ‘second’ [-Wunused-variable] int second = query[nod][i].second; ^ user.cpp:34:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < A[nod].size(); i++) ^