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:32:24: warning: unused variable ‘step’ [-Wunused-variable] int node = q.front(), step = 1, new_node; ^ user.cpp: In function ‘void check()’: user.cpp:50:39: 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:63:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nodes.size(); i++) ^