Compilare: main.cpp: In function 'void prim()': main.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<fort.size();i++) ~^~~~~~~~~~~~ main.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[x].size();j++) ~^~~~~~~~~~~~ main.cpp:63:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v[a.e].size();i++) ~^~~~~~~~~~~~~~