Compilare: main.cpp: In function 'int main()': main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<l[nod].size();i++){ ~^~~~~~~~~~~~~~