Compilare: main.cpp: In function 'int main()': main.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<lista[1].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:29:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<lista[nod].size();i++) ~^~~~~~~~~~~~~~~~~~