Compilare: user.cpp: In function ‘int bfs(int)’: user.cpp:25:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:55:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[s].size();i++){ ^