@[NM_ljy](/user/688783) 在带取模的运算中用除法是错误的,可以用乘法逆元或者把`fast(n)/2`改成`fast(n-1)` by As_Snow @ 2023-04-15 13:27:10
@[As_Snow](/user/548999) thx. by SilverLi @ 2023-04-15 15:01:39