Compilare: main.cpp: In function 'void Kruskal()': main.cpp:51:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==edge.size()-2&&okay!=false){ g<<ans<<'\n'; return; } ~^~~~~~~~~~~~~~~ main.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<edge.size(); ++i) ~^~~~~~~~~~~~