Compilare: main.cpp: In function 'void niv(int, int)': main.cpp:19:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecini[nod].size();i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:38:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nivel[i].size();j++) ~^~~~~~~~~~~~~~~~ main.cpp:51:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int fiu=0;fiu<vecini[nod].size();fiu++) ~~~^~~~~~~~~~~~~~~~~~~