Compilare: user.cpp: In function ‘void erase(int, int)’: user.cpp:21:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] v.erase( v.begin() + left, (v.size() - 1 <= right ? v.end() : v.begin() + right+1)); ^ user.cpp: In function ‘int main()’: user.cpp:181:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i< v.size(); i++) ^