Compilare: user.cpp: In function ‘int main()’: user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < vec.size();++i) ^ user.cpp:69:36: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << l << " " << p1 << " " << p2; ^ user.cpp:69:21: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << l << " " << p1 << " " << p2; ^