Compilare: main.cpp: In function 'void prim(int)': main.cpp:27:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[r].size();i++) ~^~~~~~~~~~~~ main.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod_curent].size();i++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp:24:11: warning: unused variable 'vecin' [-Wunused-variable] int i,vecin,nod_curent,cost_curent; ^~~~~ main.cpp: In function 'int main()': main.cpp:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<solutie.size();i++) fout<<solutie[i].f<<" "<<solutie[i].s<<'\n'; ~^~~~~~~~~~~~~~~