Compilare: main.cpp: In function 'int bfs()': main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<L[maxi].size();i++){ ~^~~~~~~~~~~~~~~