Compilare: user.cpp: In member function ‘int delta_vector::get(int)’: user.cpp:18:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a-st_coord < 0 || a-st_coord >= buf.size()){ ^ user.cpp: In member function ‘void delta_vector::set(int, int)’: user.cpp:23:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a-st_coord >= 0 && a-st_coord < buf.size()){ ^ user.cpp: In function ‘int main()’: user.cpp:8:7: warning: ‘vechi.delta_vector::d’ may be used uninitialized in this function [-Wmaybe-uninitialized] class delta_vector{ ^ user.cpp:36:15: note: ‘vechi.delta_vector::d’ was declared here delta_vector vechi, nou; ^