Compilare: In function ‘void inmultire(long unsigned int (*)[3], long unsigned int (*)[3])’: cc1plus: warning: iteration 2ul invokes undefined behavior [-Waggressive-loop-optimizations] user.cpp:20:5: note: containing loop for(unsigned long i=0;i<=3;i++) ^ cc1plus: warning: iteration 2ul invokes undefined behavior [-Waggressive-loop-optimizations] user.cpp:21:9: note: containing loop for(unsigned long j=0;j<=3;j++) ^