Compilare: main.cpp: In function 'void bfs()': main.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<v[f].size();t++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<s.size();t++) ~^~~~~~~~~