Compilare: main.cpp: In function 'void Prim(int)': main.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:29:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[to].size(); i++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ans.size(); i++) ~^~~~~~~~~~~ main.cpp:49:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ans.size(); i++) ~^~~~~~~~~~~