Compilare: user.cpp: In function ‘void BF()’: user.cpp:36:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < list[node].size(); i++){ ^ user.cpp: In function ‘void check()’: user.cpp:53:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < back[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:65:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nodes.size(); i++) ^