Compilare: user.cpp: In function ‘int bfs(int)’: user.cpp:33:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:59:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[n].size(); i++) { ^ user.cpp:84:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[1].size(); i++) { ^