Compilare: user.cpp: In function ‘int bfs()’: user.cpp:25:40: 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:67:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < w[i].size(); j++){ ^ user.cpp:73:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[dest].size(); i++){ ^