Compilare: main.cpp: In function 'void prim()': main.cpp:38:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[i].size(); j++) ~^~~~~~~~~~~~ main.cpp:45:15: warning: 'D' may be used uninitialized in this function [-Wmaybe-uninitialized] viz[D]=1; ~~~~~~^~ main.cpp:46:16: warning: 'S' may be used uninitialized in this function [-Wmaybe-uninitialized] tata[D]=S; ~~~~~~~^~