Compilare: user.cpp: In function ‘void bfs()’: user.cpp:69:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0;i < v[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:123:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();++j) ^ user.cpp:127:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<v[nod].size();++k) ^