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:182:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i< v.size(); i++) ^ user.cpp:128:6: warning: unused variable ‘st’ [-Wunused-variable] int st = 1; ^ user.cpp:129:6: warning: unused variable ‘dr’ [-Wunused-variable] int dr = n; ^ user.cpp:135:14: warning: unused variable ‘s2’ [-Wunused-variable] int s1, f1, s2, f2; ^ user.cpp:135:18: warning: unused variable ‘f2’ [-Wunused-variable] int s1, f1, s2, f2; ^