Compilare: main.cpp: In function 'void Prim()': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<M[i].size();j++) ~^~~~~~~~~~~~ main.cpp:36:14: warning: 'D' may be used uninitialized in this function [-Wmaybe-uninitialized] Viz[D]=1; ~~~~~~^~ main.cpp:37:15: warning: 'S' may be used uninitialized in this function [-Wmaybe-uninitialized] tata[D]=S; ~~~~~~~^~