Compilare: main.cpp: In function 'bool bfs()': main.cpp:25:24: 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:50:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<L[n].size(); i++) ~^~~~~~~~~~~~