Compilare: user.cpp: In function ‘int main()’: user.cpp:22:11: warning: suggest parentheses around assignment used as truth value [-Wparentheses] viz[x]=dist[x]=1; ^ user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodes[nod].size();i++) ^ user.cpp:46:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodes[nod].size();i++) ^