Compilare: user.cpp: In function ‘int main()’: user.cpp:34:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q.size(); i++) { ^ user.cpp:36:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < a[nod].size(); j++) ^ user.cpp:48:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q.size(); i++) { ^ user.cpp:50:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < a[nod].size(); j++) ^