Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:18:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<t[k].size(); i++) ^ user.cpp: In function ‘void bfs1(int)’: user.cpp:31:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<t[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:53:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i!=q.size(); i++) ^