Compilare: user.cpp: In function ‘int bfs()’: user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<L[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:51:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[n].size(); i++) { ^