Compilare: main.cpp: In function 'int bfs()': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[N].size();i++){ ~^~~~~~~~~~~~