Compilare: main.cpp: In function 'bool bfs()': main.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[node].size();i++){ ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[N].size();i++){ ~^~~~~~~~~~~~