Compilare: main.cpp: In function 'bool ok(int)': main.cpp:16:7: warning: unused variable 'ad' [-Wunused-variable] int ad = 0; ^~ main.cpp: In function 'int main()': main.cpp:44:9: warning: variable 'mxind' set but not used [-Wunused-but-set-variable] int mxind,x1,x2,y1,y2; ^~~~~ main.cpp:71:51: warning: 'y2' may be used uninitialized in this function [-Wmaybe-uninitialized] g << x1 << " " << y1 << " " << x2 << " " << y2; ^ main.cpp:71:29: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] g << x1 << " " << y1 << " " << x2 << " " << y2; ^~~ main.cpp:71:42: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized] g << x1 << " " << y1 << " " << x2 << " " << y2; ^~~ main.cpp:71:16: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized] g << x1 << " " << y1 << " " << x2 << " " << y2; ^~~