Compilare: main.cpp: In function 'void bfs()': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vo[u].size();i++) ~^~~~~~~~~~~~~ main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vi[u].size();i++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:15: warning: operation on 'lg' may be undefined [-Wsequence-point] l[++lg]=viz[l[lg-1]]; ^~~~ main.cpp:69:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vo[1].size();i++) ~^~~~~~~~~~~~~