Compilare: user.cpp: In function ‘int main()’: user.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(start<v.size() && v[start].ff==0) ^ user.cpp:58:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=start;k<v.size();++k) ^