Compilare: user.cpp: In member function ‘void Immortal::back()’: user.cpp:56:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (secventa.size() == imms - 1) ^ user.cpp:126:4: warning: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Wstrict-overflow] if (x1 < x2) ^ user.cpp:115:4: warning: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Wstrict-overflow] if (y1 < y2) ^ user.cpp:126:4: warning: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Wstrict-overflow] if (x1 < x2) ^ user.cpp:115:4: warning: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Wstrict-overflow] if (y1 < y2) ^