Compilare: main.cpp: In function 'void add(node*, int)': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod->vec.size();++i) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<r.size();++i) ~^~~~~~~~~ main.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nod->vec.size();++j) ~^~~~~~~~~~~~~~~~