Compilare: user.cpp: In function ‘int main()’: user.cpp:22:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(x>v.back()&&v.size()+n-i>=k){v.pop_back();v.push_back(x);} ^ user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) ^