#快速幂
by Alextokc @ 2017-02-10 12:45:21
二项式定理，答案就等于$$2^{n-1}$$
by ACoder_ @ 2017-02-28 09:40:41
楼主不要装逼，直接1<<n-1就行
by GoAway @ 2017-04-03 16:40:03
那样会错，我试过了。 @ GoAway
by 北海_Beihai @ 2017-08-01 14:15:47
@[GoAway](/space/show?uid=39497)
by 北海_Beihai @ 2017-08-01 14:16:43
还是老老实实打快速幂吧……
by info___tion @ 2018-05-24 20:03:20