Compilare: user.cpp: In function ‘int main()’: user.cpp:43:60: warning: iteration 103u invokes undefined behavior [-Waggressive-loop-optimizations] for(i=2;i<=1000001;i++) {mu=a[i-1]*i;a[i]=mu%1000000007;}; ^ user.cpp:43:5: note: containing loop for(i=2;i<=1000001;i++) {mu=a[i-1]*i;a[i]=mu%1000000007;}; ^