Compilare: main.cpp: In function 'void bfs(int)': main.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<L[nod].size(); i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:81:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<L[0].size(); i++){ ~^~~~~~~~~~~~